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Gerni Neptune 5 Operating Manual

Neptune 7

Made by: Gerni
Type: Operating Guide
Category: Pressure Washer
Pages: 21
Size: 1.87 MB

 

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Operating guide 

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Instrucciones de manejo 

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301002982 – 2007-01-02

Operating guide

NEPTUNE 5
NEPTUNE 7

NEPTUNE 5
NEPTUNE 7

 


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1

english

1)

 Optional accessory / model variants

NEPTUNE 5 / 7 

Contents

Symbols used to mark
instructions

1 Important safety

instructions

2 Description

3 Before starting the cleaner

4 Control / Operation

5 Applications and methods

6 After using the cleaner

7 Maintenance

8 Troubleshooting

9 Further information

............................................................................................2

............................................................................................2

2.1

Purpose................................................................................4

2.2

Operating elements ..............................................................5

3.1

Transport and assembly .......................................................5

3.2

Set the brake ........................................................................5

3.3

Install Crank handle for high pressure hose reel/cord reel

1)

.6

3.4

Fill up detergent tanks ..........................................................6

3.5

Fill up tank for AntiStone (Anti-Scale) ..................................6

3.6

Adjusting the AntiStone (Anti-Scale) device .........................6

3.7

Fill up fuel tank .....................................................................7

3.8

Connecting the high pressure hose......................................7

3.9

Connecting the water supply ................................................7

3.10 Electrical connection ............................................................8
3.11 Antifreeze - before first use ..................................................8

4.1

Connections .........................................................................8

4.2

Switching on the cleaner ......................................................9

4.3

Pressure regulation (Tornado Lance) ...................................9

4.4

Pressure regulation (VarioPress Gun)

1)

..............................10

4.5

Using cleaning agents ........................................................10

5.1

Techniques .........................................................................10

5.2

Some typical cleaning tasks ...............................................11

6.1

Switching off the cleaner ....................................................13

6.2

Disconnecting supply lines .................................................13

6.3

Rolling up the electrical lead and storing accessories .......13

6.4

Storing the cleaner (below 0°C (32°F / Freezing)...............13

7.1

Maintenance Schedule.......................................................14

7.2

Maintenance work ..............................................................14

8.1

Indications on Display ........................................................16

8.2

Indication lights on control panel ........................................17

8.3

Other Faults........................................................................17

9.1

Recycling the cleaner .........................................................17

9.2

Warranty .............................................................................18

9.3

Technical data ....................................................................18

9.4

EU Declaration of Conformity.............................................18

 


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1)

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NEPTUNE 5 / 7

1 Important safety instructions

Symbols used to mark
instructions

Before using the 

h i g h - p r e s s u r e 
cleaner, be sure 
to also read the 

enclosed operat-

i n g   i n s t r u c t i o n s 

and keep them within reach at 
all times.

For your own safety

The high-pressure cleaner should  
only be used by authorized per-
sons who have been instructed 
in its use.

Although extremely easy to 
operate, children should not be 
allowed to use the cleaner.

General

Use of the high-pressure cleaner 
is subject to the applicable local 
regulations.
Besides the operating instruc-
tions and the binding accident 
prevention regulations valid in 
the country of use, observe rec-
ognized regulations for safety 
and proper use.
Do not use any unsafe work 
techniques.

Transport

Transport of the high-pressure 
cleaner is easy on its large 
wheels. 

For safe transport in and on ve-
hicles we recommend preventing 
the equipment from sliding and 
tilting. Secure it with tie-downs 
and apply the parking brake on 
the castor wheel.

For transport at temperatures 
around or below freezing 0°C 
(32°F), anti-freeze should be 
drawn into the pump beforehand 
(see chapter 6). 

Before starting the cleaner

If your 3-phase cleaner was 
supplied without a plug, have 
it fitted with a suitable 3-phase 
plug with ground, by a qualified 
electrician.

Before use, check that the high-
pressure cleaner is safe and in 
proper condition. 

Regularly check whether the 
power cord is damaged or shows 
signs of ageing. 
Use the high-pressure cleaner 
only when the power cord is in 
a safe condition. (risk of electric 
shock using damaged cord!).

Check the rated voltage of the 
high-pressure cleaner before 
connecting it to the mains power 
supply. Ensure that the voltage 
shown on the rating plate cor-
responds to the voltage of the 
power supply.
We strongly recommend that the 
power supply to the high pres-
sure cleaner be connected via a 
residual current circuit breaker. 
This device stops the supply of 
electricity if the leakage current 
to the ground exceeds 30 mA for 
30 ms or it has an ground tester 
circuit.

Please observe the regulations 
and provisions applicable in your 
area. Before putting the high-
pressure cleaner into service, 
carry out a visual check of all 
the major components.

Safety instructions 

in these operating 

instructions which 

must be observed 

to prevent risks 

to persons are marked with this 
danger symbol.

This symbol is used to 

mark safety instruc-

tions that must be 

observed to prevent 

damage to the machine 

and its performance.

T h i s   i n d i -
c a t e s   t i p s 

and instructions 

to simplify work 

a n d 

to ensure safe opera-

tion.

Operations marked 

with this symbol 
should only be 
c a r r i e d   o u t   by 

G e r n i   S e r v i c e 

Technicians.

 


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CAUTION!

High-pressure water jets can 
be dangerous if misused. The 
jet must not be directed at per-
sons, animals, live electrical 
equipment or the cleaner itself.
Wear appropriate protective 
clothing and eye protection.

Do not direct the jet towards 
yourself or towards other per-
sons in order to clean clothes 
or footwear. 

During operation of the cleaner, 
recoil forces are produced at the 
gunvalve and spray lance and, 
when the spray lance is held at 
an angle, a torque is also cre-
ated. The gunvalve and spray 
lancemust therefore be held 
firmly in both hands.

Do not use the cleaner when 
other people without protec-
tive clothing are in the working 
area.

Check that cleaning will not 
result in dangerous substances 
(e.g. asbestos, oil) being washed 
off the object to be cleaned and 
harming the environment.

Do not clean delicate par ts 
made of rubber, fabric, etc. with 
the 0° jet.  Keep some distance 
between high pressure nozzle 
and surface in order to prevent 
the surface from damage.

Do not use the high-pressure 
hose for lifting loads.

NOTE

!

The maximum permissible work-
ing pressure and temperature 
are printed on the high-pressure 
hose.

Do not use the cleaner if the 
power cord or high-pressure 
hose is damaged.

Ensure adequate air circulation. 
Do not cover the cleaner or oper-
ate it in inadequately ventilated 
rooms!

Store the cleaner where 

it will not be exposed to 

frost!

Never operate the cleaner with-
out water. Even brief shortages 
of water result in severe damage 
to the pump seals.

Operation

Keep cabinet and service door 
closed during operation.

CAUTION!

Unsuitable extension cords can 
represent a source of danger. 
Always unwind cord from the 
reels completely to prevent the 
power cord overheating.

Connectors and couplings of 
extension cords must be water-
tight.

Extension cords are not recom-
mended, however if necessaray 
refer to the following recommen-
dations:

Cord length
m

Cross section

up to16 A up to 25 A

up to 20 m 
(US: 30 ft)
(US: 50 ft)
(US: 75 ft)

ø1.5mm²
14 gauge
12 gauge
10 gauge

ø2.5mm²
12 gauge
10 gauge
not recom-
mended

20 to 50 m

ø2.5mm²

ø4.0mm²

Do not damage the power cord 
(e.g. by driving over it, pulling or 
crushing it).

Disconnect the power cord by 
grasping the plug only (do not 
pull or tug the power cord).

CAUTION!

Unsuitable fuels (e.g. gasoline) 
must not be used as they can 
explode and catch fire.

Use clean fuel only, free of mois-
ture and contamination. Contact 
your dealer for fuel source and 
type recommendations.

This machine can be used 
with Bio-Diesel (DIN 51606). 
However, our experience has 
shown that the fuel quality is 

often outside the recognized 
standards. An organic product 
like Bio-Diesel can be affected by 
long-term storage (e.g. over the 
winter), extreme temperatures, 
or improper transportation. When 
the condition of the fuel is outside 
the standards, trouble may occur 
which cannot be covered by the 
Warranty.

If the machine is to be oper-
ated at fuel stations or in other 
potentially hazardous areas, the 
machine may only be employed 
outside the hazard areas defined 
in the German  „Technical Guide-
lines for Inflammable Fluids“ ap-
plicable at the point of use due 
to the potential explosion hazard 
posed by the burner.

If the machine is to be operated 
indoors, the local building regu-
lations must be observed for the 
discharge of the exhaust fumes 
into the atmosphere. Ensure an 
adequate supply of fresh air. 

If the machine is to be con-
nected to a flue gas stack, then 
local building regulations must be 
observed. We will be glad to pro-
vide tips for connection systems, 
on request.

CAUTION!

Do not touch or cover the ex-
haust. Risk of burns and fire.

Electrical equipment

CAUTION!

Never spray electrical equip-
ment with water: risk of electtri-
cal shock and short-circuit.

The cleaner may only be con-
nected to a correctly installed 
plug socket.

Switching on the cleaner may 
cause voltage fluctuations.
Voltage fluctuations should not 
occur if the impedance at the 
transfer point is less than 0.15

:

If in doubt ask your local electric-
ity supplier.

 


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Maintenance and repair

CAUTION!

Always remove the plug from the 
power supply before cleaning or 
carrying out maintenance work 
on the cleaner.

Carry out only the maintenance 
operations described in the 
operating instructions. Use only 
original Gerni spare parts.
Do not make any technical 
modifications to the high-pres-
sure cleaner.

Ensure that the machine is regu-
larly serviced by authorized Gerni 
dealers in accordance with the 
maintenace plan. Failure to do 
so will void the warranty.

CAUTION!

High-pressure hoses, fittings 
and couplings are important for 
the safety of the cleaner. Use 
only high-pressure parts ap-
proved by the manufacturer!

The power cord must not differ 
from the version specified by the 
manufacturer and may only be 
changed by an electrician.

Please contact your local author-
ized Gerni equipment distributor 
for all other maintenance or re-
pair needs!

Testing

The cleaner conforms to the Ger-
man „Guidelines for Liquid Spray 
Jet Devices“. The high-pressure 
cleaner must be subjected to a 
safety examination in accord-
ance with the „Accident Preven-
tion Regulations for Working 
with Liquid Spray Jet Devices“ 
as required, but at least every 
12 months, by an authorised 
inspector.

After all repairs or modifica-
tions to electrical equipment, 
the protective conductor resist-
ance, the insulation resistance 
and the leakage current must 
be measured. Furthermore, a 
visual inspection of the mains 
power lead, a voltage and current 
measurement and a function test 
must be carried out. Our after-
sales service technicians are 
at your disposal as authorised 
inspectors.

The complete „Accident Preven-
tion Regulations for Working 
with Liquid Spray Jet Devices“ 
are available from the Carl Hey-
manns Verlag KG, Luxemburger 
Strasse 449, 50939 Cologne or 
from the appropriate associa-
tion of employers’ liability insur-
ances.

The pressure-bearing parts of 
this high-pressure cleaner have 
been manufactured in accord-
ance with § 9 of the German 
Pressure Vessels  Ordinance 
and successfully subjected to a 
pressure test.

Unloader valve

Pump pressure is reduced by 
means of an "unloader valve" 
which returns water to the inlet 
side of the pump at a minimum 
pressure. The point at which 
this occurs is set and sealed 
at the factory and must not be 
adjusted.

2 Description

2.1 Purpose

This high-pressure cleaner has 
been designed for professional 
use in

– Agriculture
– Industry
– Transport industry
– Automotive
– Municipal Facilities
– Janitorial
– Construction
– Food Industry
etc.

Chapter 5 describes the use of 
the high-pressure cleaner for 
various cleaning jobs.

Always use the cleaner as 
described in these operating 
instructions. Any other use may 
damage the cleaner or the sur-
face to be cleaned or may result 
in severe injury to persons. 

 


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2.2 

Operating elements

See fold-out page at front of these
operating instructions.

1 Spray lance
2 Spray lance storage
3 Control panel
4 Crank handle for

High pressure hose reel
(Neptune ..X)

1)

Cord reel (Neptune ..X2)

1)

5 Fuel level gauge
6 Tank filler for fuel
7 Receptacle for service 

crane and lifting ring

1)

8 Top cover release
9 Service door release

10 Crank handle for

High pressure hose reel 
(Neptune ..X2)

1)

11 High pressure hose connec-

tion for machines without
hose reel

12 Main switch ON/OFF - cold 

water/hot water

13 Display (Temperature or

Codes)

14 Temperature control
15 Low fuel indicator
16 Low AntiStone (Anti-Scale)

indicator

17 Service interval due/expired
18 Pump oil low
19 Detergent metering knob
20 Pressure gauge
21 Power ON
22 Castor with parking brake
23 Water supply connection
24 Tank filler for anti-freeze
25 Tank filler for Gerni Anti-

Scale

26 Canister for detergent B

1)

27 High pressure hose reel

(Neptune ..X)

1)

28 Power cord reel

(Neptune ..X2)

1)

29 Tank filler for detergent A
30 Grip for top cover

3 Before starting the cleaner

3.1 Transport and assembly

chine by hand from the pallet. 
Due to the weight this work 
should be done by at least
three persons. 

CAUTION!

Do not hold the plastic tank to lift
the  machine  as  it  could  become 
detached from the frame.

The  best places to hold  the ma-

chine are

– on the handle
– on the frame between the front

wheels and the guide rollers.

Every fuel-burning appliance, such 
as pressure washers, depends
upon a proper mix of fuel and air 
(by weight) for proper combustion. 
Therefore some adjustment of the

air supply to the burner may be nec-
essary to take account of altitude
and the resulting air pressure. This
is true whether your fuel is ‘Natural 
gas’, Propane or Diesel.
Your Gerni hot water pressure
washer was thoroughly tested and
adjusted for optimum performance
before it left our factory. The factory
is  located at approximately 200m
(650 ft) above sea level, and the 
combustion settings are optimal for 
that elevation. 

If your location is higher than
1200m (3900 ft) above sea level,
your burner may require re-ad-
justment for proper performance
and best fuel economy. Contact
your Dealer or Gerni for assist-
ance.

3.2 

Set the brake

1. Before using the cleaner for 

the first time, check it carefully 
for any faults or damage.

2. Run the machine only when 

it is in perfect working condi-
tion.

3. Set the brake.

1. The safest way to lift the ma-

chine is to use a fork-lift truck 
The arrows in the illustration 
indicate the  best  places to
position the fork.

2. It is also possible to lift the ma-

 


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NEPTUNE 5 / 7

3.5 Fill up tank for

AntiStone (Anti-Scale)
indicator

1. Fill up AntiStone (Anti-Scale)/

water softener reservoir with the 
sample bottle provided. AntiStone 
(Anti-Scale) prevents any depos-
its of scale and acts at the same 
time as a corrosion inhibitor. 

For compatibility reasons, use only 
the tested AntiStone (Anti-Scale) 
which is available as a six-pack  of 1 
liter bottles by ordering part number 
8466.

3.4 Fill up detergent tanks

1. Fill up detergent tanks (A) and 

(B) with prediluted detergent.
Capacity see chapter 9.3 Techni-
cal Data

3.3 Install Crank handle

for high pressure hose
reel/cord reel

1)

1. Pull cap of crank in arrow direc-

tion.

2. Align tabs on crank with slot in 

axle.

3. Put crank on axle of high pres-

sure hose reel/cord reel.

4. Fix crank by pushing the cap.

3.6 Adjusting the AntiStone

(Anti-Scale) device

The AntiStone device is set at the 
factory to a water hardness of class 
2. Adjustment:
1. Open cabinet (A) and service 

door (B).

2. Only on ..X2 models: remove 

crank.

3. Measure the water hardness or 

ask your water supply company.

4. Set the adjusting knob to required 

position.

B

A

0

1

2

3

4

012

34

A

B

mg/l

Grains

O

dH

°e

°f

ppm Ca

Description

Setting

NEPTUNE 5

NEPTUNE 7/8

0-17

0-1

0-7

0-8.8

0-12.5

0-50

Soft

0

0

17-60

1.1-3.5

Slightly Hard

1

1-2

60-128

3.6-7.5

7-14

8.8-17.5

12.5-25.1

51-150

Moderately Hard

2

2-3

128-180

7.6-10.5

14-21

17.5-26.3

25.1-37.6

151-300

Hard

3

3-4

>180

>10.5

>21

>26.3

>37.6

>300

Very Hard

4

4

 


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3.7 Fill up fuel tank

With the machine cold, turned 
off and disconnected from power 
supply:

1. Fill fuel tank from a clean con-

tainer with a fresh fuel (fuel oil 
EL, or Diesel oil DIN 51 603), 
or fuel type recommended by 
your distributor.

Bio-Diesel can be used, see 
notes in chapter 1.
The fuel must be free from con-
tamination. 
Tank capacity see chapter 9.3 
Technical data.

months it is recommended that 
a fuel conditioner/stabilizer be 
added (available from the fuel 
oil trade).

3.8 Connecting the high

pressure hose

3.8.1 Machines with high

pressure hose reel

1)

1. Connect the high pressure 

hose quick connector to the 
high pressure nipple (A) lo-
cated at the hose reel axle.

2. Place the high pressure hose 

into the hose guide (B) and 
ritain it with the clip.

3. Release the brake (C) on the 

hose reel and wind up the 
high pressure hose.      

3.8.2 Machines without high

pressure hose reel

1. Connect the high pressure 

hose quick connector to the 
high pressure nipple located 
at right rear of machine above 
chemical tank.

3.9 Connecting the water

supply

1. Attach quick connect adapter 

found with Owners Manual to  
the water supply hose.

2. Rinse the water supply hose 

briefly in order to prevent sand 
an other dirt particles entering 
into the machine.

3. Attach water supply hose with 

adapter to inlet quick connec-
tor.

4. Open water supply faucet.

A

B

C

NOTE

!

At temperatures below 8°C 
(46°F), the fuel oil begins to so-
lidify (paraffin precipitation). This 
can lead to difficulties in starting 
the burner. Before the winter 

 


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4 Control / Operation

4.1 Connections
4.1.1 Connecting the spray

lance to the spray gun

1. Pull the blue quick-release 

grip (A) of the spray gun for-
wards and lock it by turning it 
to the left.

2. Insert the nipple of the spray 

lance (C) into the quick-re-
lease connection and turn the 
blue quick-release grip to the 
right (B).

3. Pull the spray lance (or other 

accessory) forwards to check 
that it is securely attached to 
the spray gun.

NOTE!

Always remove any dirt from 
the nipple before connecting the 
spray lance to the spray gun.

3.10 Electrical connection

3.11 Antifreeze - before first

use

The machine is flushed with anti-
freeze at the factory to protect it 
against freezin; this mixture (ap-

prox. 5 l) may be captured in a 
suitable container for reuse.

CAUTION!

When using a cord reel:

1. Release brake of the cord 

reel.

2. Unwind the cord completely.

CAUTION!

The cleaner should only be con-
nected to a correctly installed 
electrical supply.

1. Observe safety instructions in 

chapter 1.

2. Insert the plug into the electri-

cal socket.

NOTE!

See chapter 9.3 Technical Data 
for required quantity of water and 
water pressure. 
In the case of poor water quality 
(sand, etc.), it is recommended 
that an inlet water filter be in-
stalled.

Water supply hose should be 
a reinforced hose and have a 
minimum inside diameter of  

3/4"

(19 mm).

A

B

C

 


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1. Open cabinet (and service door 

if desired - see chapter 3.6, Step 
1+2).

2. Turn the twist grip on the safety 

control block all the way to the left 
(counter-clockwise-direction).

3. Turn the main switch to position  

.

4. Select temperature (over 100°C 

(212°F)).

For special applications: replace the 
standard nozzle with the steam spray 
nozzle (accessory).

4.2 Switching on the

cleaner

4.2.1 Cold water operation /

Hot water operation (up
to 100°C)

1. Turn the main switch to posi-

tion

  (cold water).

Control electronics accomplishes 
a self check.
The Display shows for approx. 1 
second „---“.
The motor starts.

 is ON.

2. Turn the main switch to posi-

tion

 (hot water).

3. Select temperature.

4. Unlock the spray gun and 

squeeze trigger.

5. The oil burner will light.

6. Release trigger and lock the 

spray gun when not in use.

NOTE!

The cleaner switches off auto-
matically twenty seconds after 
the spray gun has been closed. To 
start the cleaner again, squeeze 
the trigger and the machine will 
start automatically.

4.3 Pressure regulation

(Tornado Lance)

1. Turn the twist grip on the spray 

unit:

– High pressure = 

clockwise (+) for high pres-
sure

– Low pressure = 

counter-clockwise (–) for low 
pressure.

4.2.2 Steam operation (over

100°C (212°F))

0

I

M

BAR

 


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 Optional accessory / model variants

NEPTUNE 5 / 7

5 Applications and methods

Efficient high pressure cleaning is achieved by following a few guide-
lines, combined with your own personal experience of specific clean-
ing tasks. Accessories and detergents, when correctly chosen, can 
increase the efficiency of your pressure washer. Here is some basic 
information about cleaning.

5.1.1 Soaking

Encrusted or thick layers of dirt can be loosened or softened up by a 
period of soaking. This is for example an ideal method within agricul-
ture – for example, within pig sties. The ideal soaking method can be 
achieved by using foam or simple alkaline detergent. Let the product 
lie on the dirty surfaces for about 30 minutes before pressure washing. 
The result will be a much quicker high pressure cleaning process.

5.1 Techniques

4.5 Using cleaning agents

1. Select desired detergent (A) 

or (B) and amount by turning 
the knob to desired percent-
age.

2. S p r ay   t h e   o b j e c t   t o   b e 

cleaned.

3. Allow the cleaning agent to 

work, depending on the de-
gree of soiling. Then rinse off 
with high pressure.

4.4 Pressure regulation

(VarioPress Gun)

1)

1. Turn the twist grip on the 

spray unit:

Water volume

(–) 

 

  (+)

min. 

  max.

The percentage shown in the 
illustration are only approximate 
data.
For special applications such as 
disinfection, the exact detergent 
concentration has to be deter-
mined by using a graduated 
measuring container. For water 
outlet volume of the machine see 
chapter 9.3 technical data.

,

CAUTION!
Never allow cleaning agent
to dry on the surface to be
cleaned. The surface may be
damaged.

5%

ca.

ca.

3%

5%

3%

1%

1%

A

B

 


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5.1.2 Detergent and Foam

Foam or detergent should be applied onto dry surfaces so that the 
chemical product is in direct contact with the dirt. Detergents are ap-
plied from bottom to top, for example on a automobile bodywork, in 
order to avoid “super clean” areas, where the detergent may collect 
in higher concentrations and streams downwards. Let the detergent 
work for several minutes before rinsing before rinsing and never let 
it dry on the surface being cleaned.

5.1.3 Temperature

Detergents are more effective at higher temperatures. Greases, oils 
and fats can be broken down more effectively at higher temperatures 
also. Proteins can be cleaned at temperatures of around 60°C (140°F). 
Oils and traffic film around 70°C (158°F), and grease can be cleaned 
at 80°-90°C (176-194°F).

5.1.4 Mechanical Effect

In order to break down tough layers of dirt, additional mechanical 
effect may be required. Special lances and rotary or wash brushes 
offer this supplementary effect that cuts through dirt. 

5.1.5 High Water Flow or

High Pressure

High pressure is not always the best solution and may also damage 
surfaces. The cleaning effect also depends upon water flow. Pres-
sure levels of around 100 bar (1450 psi) may be sufficient for vehicle 
cleaning (in association with hot water) and  higher flow levels give 
the ability to rinse and flush away large amounts of dirt easily.

5.2  Some typical cleaning tasks
5.2.1 Agriculture

Task

Accessories

Method

Stables
Pig Pens, Sties

Cleaning of walls, 
floors and equip-
ment

Disinfectant

Chemical Foam Injec-
tors
Foam lance
Powerspeed lance
Floor Cleaner

Detergents
Universal
Alkafoam

Disinfectant
DES 3000

1. Soaking – apply foam to all surfaces (bottom to top) 

and wait for approx. 30 minutes.

2. Remove the dirt from surfaces with the high pressure 

lance or chosen accessory. Again, clean from bottom 
to top on vertical surfaces.

3. To flush away large quantities of dirt, change to low 

pressure mode and use the higher flow to push away 
the dirt.

4. Use recommended disinfectant products and methods 

to ensure hygiene. Apply DES 3000 disinfectant once 
the surfaces are perfectly clean.

Machinery
Tractors
ploughs etc.

Detergent injection
Powerspeed lances
Curved lances and un-
derchassis washers
Brushes

1. Apply detergent to vehicle or equipment surfaces in 

order to soften up dirt and grime. Apply from bottom 
to top.

2. Proceed with cleaning using the high pressure lance.  

Clean again from bottom to top.  Use accessories to 
clean in difficult to reach places. 

3. Clean fragile areas such as motors, rubber at lower 

pressure levels to avoid damage.

 


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5.2.3 Buildings and Equipment

These are merely several examples of cleaning tasks that can be solved by a pressure washer in asso-
ciation with accessories and detergents. Each cleaning task is different. Please consult your local dealer 
or Gerni representative in order to discuss the best solution for your own cleaning tasks.

5.2.2 Vehicle

Task

Accessories

Method

Vehicle bodywork

Standard lance
Detergent injection
Curved lances and un-
derchassis washers
brushes

Detergents
Aktive Shampoo
Aktive Foam
Sapphire
Super Plus
Aktive Wax
Allosil
RimTop

1. Apply detergent to vehicle or equipment surfaces in 

order to soften up dirt and grime. Apply from bottom 
to top. In cases of particularly dirty vehicles, pre-spray 
with a product such as Allosil in order to remove traces 
of insects etc, then rinse at low pressure and apply 
normal car cleaning detergent. Let detergents settle 
for 5 minutes before cleaning off. Metallic surfaces can 
be cleaned using RimTop.

2. Proceed with cleaning using the high pressure lance.  

Clean again from bottom to top.  Use accessories to 
clean in difficult to reach places.  Use brushes in order 
to add a mechanical cleaning effect. Short lances can 
help for cleaning of motors and wheel arches. Curved 
lances or undercarriage washers  can be valuable for 
the cleaning of car underchassis and wheel arches.

3. Clean fragile areas such as motors, rubber at lower 

pressure levels to avoid damage.

4. Apply a liquid wax using the pressure washer in order 

to protect the bodywork from pollution.

Task

Accessories

Method

General surfaces

Metallic equipment

Foam injectors Stand-
ard lance
Curved lances
Tank cleaning
head

Detergents
Intensive
J25 Multi
Combi Aktive
Alkafoam

Disinfectant
DES 3000

1. Apply thick foam over the surfaces to be cleaned. Apply 

on dry surfaces. Apply from top to bottom on vertical 
surfaces. Let the foam act for up to 30 minutes for the 
optimal effect.

2. Proceed with cleaning using the high pressure lance.  

Use applicable accessories. Use high pressure to 
dislodge large amounts of incrusted dirt or grime. 
Use lower pressure and high water volume in order 
to rapidly flush away loose dirt and rinse surfaces.

3. Apply DES 3000 disinfectant once the surfaces are 

perfectly clean.

Areas covered by amounts of loose dirt, such as animal 
remains in slaughterhouses, can be removed by using 
high water flow to flush away the dirt to evacuation pits 
or drains.
Tank cleaning heads can be used to clean barrels, vats, 
mixing tanks etc. Cleaning heads may be hydraulically or 
electrically powered and give the possibility for automatic 
cleaning without a constant user.

Rusted or dam-
ages surfaces prior 
to treatment

Wet Sandblasting 
equipment

1. Connect the sandblasting lance to the pressure 

washer and place the suction tube in the sand.

2. Always wear protective equipment during sandblast-

ing.

3. Spray the surfaces to be treated with the mix of water 

and sand. Rust, paint etc will be stripped off.

 


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6 After using the cleaner

6.1 Switching off the

cleaner

1. Turn the main switch to posi-

tion „

OFF

“.

2. Tur n off water supply at 

faucet.

3. Squeeze the spray gun trig-

ger until the pressure has bled 
off.

4. Slide trigger lock to the locked 

position.

6.2 Disconnecting supply

lines

1. Turn the main switch to posi-

tion „

OFF

“.

2. Tur n off water supply at 

faucet.

3. Squeeze the spray gun trig-

ger until the pressure has bled 
off.

6.3 Rolling up the electrical

lead and storing
accessories

Risk of tripping!

To prevent accidents, always 
carefully roll up the power cord.

Machines with hose and/or cord 
reel:
1. Wind up the power cord as il-

lustrated with the plug located 
in the center of the cord reel.

2. Wind up the  high pressure 

hose as illustrated.

3. Place the spray lance into the 

spray lance storage.

4. Slide trigger lock to the locked 

position.

5. Remove the water supply 

hose from the cleaner.

6. Remove power cord plug from 

the electrical supply.

6.4 Storing the cleaner

(below 0°C (32°F))

Store the cleaner in a dry heated 
location to protect against freez-
ing or protect per below instruc-
tions:

1. Remove the water supply 

hose from the cleaner.

2. Remove the spray lance.
3. Switch on the cleaner with the 

main switch in position 

4. Squeeze trigger of the spray 

gun.

5. Gradually pour antifreeze (ap-

prox. 5 litres) into the water 
tank (A).

6. While the pump is pulling the 

mixture from the water tank, 

squeeze and release the trig-
ger two or three times.

7. The machine is protected 

against freezing when anti-
freeze mixture emerges from 
the spray gun.

8. Lock the safety catch on the 

spray gun. 

9. Switch off the cleaner.
10.To avoid any possible dam-

age, store the cleaner tempo-
rarily in a heated room before 
using it again.

11.When the machine is put into 

service again, the antifreeze 
solution can be collected and 
stored for future use.

0

I

M

A

 


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7 Maintenance

7.1 Maintenance Schedule

7.2 Maintenance work
7.2.1 Water filters

Water filters are fitted at the water 
and pump inlets to prevent large 
particles of dirt from entering into 
the system.

1. Unscrew quick coupling.
2. Remove filter with tool and 

clean it.

3. Also clean filter at pump in-

let.

Weekly

NEPTUNE 5 only:

After the first 50
operating hours

Every six

months or

500 operating

hours

As

required

7.2.1 Water filters

Q

7.2.2 Oil filter

Q

7.2.3 Checking the pump oil quality

Q

7.2.4 Changing the pump oil

Q

Q

7.2.5 Emptying the fuel oil tank

Q

7.2.6 Flame Sensor

Q

7.2.2 Oil filter

1. Clean filter:

Unscrew Filter cap (1)

2. Clean/replace oil filter.
3. Properly dispose of filter and 

any solvents.

1

2

NEPTUNE 5 NEPTUNE 7

 


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7.2.4 Changing the pump oil

1. Unscrew the oil drain plug (

A

)

and drain oil into a suitable 
container.

2. Check that the drain plug 

gasket is in place and reinstall  
drain plug.

3. Fill pump with proper grade 

and amount of oil.
Oil grade and capacity see 
chapter  ‘9.3 Technical Data’.

7.2.3 Checking the pump oil

quality

1. Check color of pump oil. 

If the oil has a grey or white 
shade, change the oil (see 
chapter 7.2.4)

2. Top off oil level  with fresh oil 

if necessary.
Oil type see chapter 9.3 Tech-
nical Data.

7.2.6 Flame sensor

1. Remove the sensor and clean 

with a soft cloth.

2. Confirm that the sensor is 

correctly seated when rein-
stalling.

7.2.5 Emptying the fuel oil

tank

1. Prepare a container which 

is capable of containing the 
amount of fuel remaining in 
the tank.

2. Place drain channel beneath 

the drain plug.

3. Remove the drain plug and 

drain the fuel into the pre-
pared container carefully not 
to spill fuel oil.

4. Check that the drain plug 

gasket is in place and reinstall  
drain plug.

5. Check tank and plug for 

leaks.

A

A

NEPTUNE 7

NEPTUNE 5

 


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Indication

on Display

Cause

Remedy

FLF

>

Flow sensor fault

Contact Gerni Service
Cold water operation possible

FLO

>

Water supply turned off or inadequate supply 
to machine

Required volume flow and pressure see 
chapter 9.3 Technical Data

>

Detergent tank empty

Fill detergent tank or set detergent me-
tering to „OFF“

>

Pressure regulation on the safety control 
block or VarioPress-lance

1)

 set to low water 

volume

Turn the twist grip on safety control block  
or VarioPress-lance

1) 

to higher water/

pressure volume (see chapter 4.4)

>

Machine scaled

Contact Gerni Service

Fue

>

Fuel shortage

Fill fuel tank
Cold water operation possible

Hop

>

Motor overheated

Turn main switch in position „OFF“, let 
machine cool down

Remove extension cord, if being used.

Possible phase failure; have electrical 
connections checked

HOS

>

Machine overheated

Contact Gerni Service

LEA

>

Leakage or inadmissible operating condition 
by short-time operation

After three times of short-time operation 
the machine switches off. To reset: Turn 
main switch to position “OFF“, then start 
again. Keep trigger squeezed for longer 
than 3 seconds. If a leak occurs in the 
hose and gun and causes the machine 
to start and stop briefly 3 times, then the 
machine will switch off.

>

Spray gun leaking

Repair Spray gun

>

High pressure hose, coupling or line system 
leaking

Replace high-pressure hose, retighten 
screw fittings

>

Detergent tank empty

Fill detergent tank or set detergent me-
tering to „OFF“

>

Water inlet filter dirty

Clean filter (see chapter 7.2.1)

>

High-pressure pump drawing in air

Repair leaks

LHE

>

Flame sensor sooted

Clean flame sensor (see chapter  
7.2.6).

>

Ignition or fuel system failure

Contact Gerni Service
Cold water operation possible

LHL

>

Burner failure

Contact Gerni Service
Cold water operation possible

POL

>

Pump oil low

Fill to proper level (see chapter 7.2.3)

SEC

>

Temperature sensor damaged

Contact Gerni Service
Cold water operation possible

SEO

>

Temperature sensor damaged

Contact Gerni Service
Cold water operation possible

UPC

>

Microprocessor failure

Contact Gerni Service

8 Troubleshooting

8.1 Indications on Display

 


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NEPTUNE 5 / 7 

8.2 Indication lights on control panel

8.3 Other Faults

Indication light

Cause

Remedy

 flashing

>

see

FLO

see

FLO

 ON

>

Low fuel level

Fill fuel tank
Cold water operation possible

>

Low AntiStone (Anti-Scale) level

Fill AntiStone (Anti-Scale) tank

 flashing

>

Service interval: Service due in 20 
hours

Contact Gerni Service

 ON

>

Service interval expired

Contact Gerni Service

 ON

>

Pump oil low

Fill to proper level

Fault

Cause

Remedy

not ON

>

Power cord not properly 
connected to power supply

Check power cord connetction

Check fuse (see chapter 9.3 Technical 
Data)

Pressure too low

>

High pressure nozzle worn 
out

Replace nozzle

>

Pressure regulation set to low 
pressure or VarioPress-lance 
set to low water volume.

Turn the twist grip on safety control block 
clockwise (+) or set VarioPress-lance to 
higher water volume (see chapter 4.4)

Machine is running with pulsating 
pressure and makes knocking 
noise

>

Pump has drawn in air due to 
detergent tank being empty

Close detergent valve. Remove lance from 
gun. Operate spray gun and let machine run 
until air in pump is gone and the machine is 
running normally/calm again.

No detergents drawn in

>

Detergent tank empty

Fill detergent tank

>

Dirt in detergent tank

Clean detergent tank

>

Suction valve at cleaning 
agent inlet soiled

Remove suction valve and clean or replace

Burner soots

>

fuel contamination

   Contact Gerni Service

>

Burner sooted or adjustment 
incorrect

9 Further information

9.1 Recycling the cleaner

Make the old cleaner unusable 
immediately.
1. Unplug the cleaner and cut 

the power cord.

Do not discard of electrical ap-
pliances with household waste.
As specified in European Direc-

tive 2002/96/EC on old electrical and elec-
tronic appliances, used electrical goods 
must be collected separately and recycled 
ecologically.
Contact your local authorities or your near-
est dealer for further information.

9.2 Guarantee

Our general conditions of busi-
ness are applicable with regard 
to the guarantee. Subject to 
change as a result of technical 
advances.

The guarantee is invalidated if the machine 
is not operated in accordance with these 
instructions or otherwise abused. The guar-
antee is invalidated if the machine is not 
serviced as described.

 


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9.3 Technical data

9.4 EU Declaration of

Conformity

EU Declaration of Conformity

Product:

High Pressure Cleaner

Type:

NEPTUNE 5
NEPTUNE 7

Description:

400 V, 3~, 50 Hz / IP X5

The design of the unit corresponds to the
following pertinent regulations:

EC Machine Directive 98/37/EC
EC Low-voltage Directive 73/23/EC
EC EMC Directive 2004/108/EC

Applied harmonised standards:

EN ISO 12100-1, EN ISO 12100-2, 
EN 60335-2-79, EN 55014-1, EN 55014-2, 
EN 61000-3-2

Applied national standards and technical
specifications:

DIN EN 60335-2-79

ALTO Deutschland GmbH
Guido-Oberdorfer-Straße 2-8
D-89287 Bellenberg

Dipl. Ing. Wolfgang Nieuwkamp
Tests and approvals

Bellenberg, 2007-01-02

NEPTUNE 5 / 7

5-57 X

7-63

Voltage 

V

400 V / 3~ / 50Hz

Fuse (slow)

A

16

Power rating

kW

7.9

8.3

Power consumption

A

14.3

15.0

Protection type

IP X5

Working pressure

bar (Mpa)

200 (20)

175 (17.5)

Permissible pressure

bar (Mpa)

250 (25)

Volume flow (max)

l/h

1080

1260

Volume flow Q

IEC

l/h

1000

1170

Cleaning Impact

kg/Force

5.7

6.3

High pressure nozzle

NT 0550

NT 0680

Permissible temperature

°C

80-140

100-140

Max. water inlet temperature

°C

40

Max. water inlet pressure

bar (Mpa)

10 (1)

Dimensions l x w x h

mm

1190 x 702 x 987

1190 x 702 x 1020

Weight kg

189

224

Noise level at a distance of 1 m
EN 60704-1

dB(A)

74.1

76.6

Sound power level LW

A

dB(A)

91

93

Vibration ISO 5349

m/s²

< 2.5

Recoil forces

N

56

61

Heating capacity

kW

86

115

Fuel tank

l

35

Detergent tank

l

15

Pump Oil quantity

l

1

Pump Oil type

SAE 15 W-40

Castrol AlphaSyn-T ISO 150

 


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ps

i

bar

psi

bar

4

3

5

29

30

24

25

23

27

22

21

28

26

6

11

10

8

9

12

14

13

15

16
17
18

19

20

7

2

1

NEPTUNE 5 / 7

 


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Nilfisk Advance Pty Ltd

48 Egerton Street

Silverwater NSW 2128

Ph: 1300 556 710

Email: customerservice@nilfisk-advance.com.au