PDF User Manual

Instruction Manual
PL70-A8-EN

03/03/2017

A8R Series

Reversible Axial Piston Power Motor

For additional product information visit our website at http://www.apextoolgroup.com

Page 2

PL70-A8-EN

03/03/2017

Nomenclature

@ Max. HP Free Speed ft. lbs.

Nm

ft. lbs.

Nm

lbs.

kg

lbs.

kg

A8R309M

1300

2600

19

26

14

19

38

17.2

----

1000

454

A8R309M-NS

1300

2600

19

26

14

19

38

17.2

----

1000

454

A8R310M

375

765

64

87

48

65

38

17.2

3.4:1

1000

454

A8R310M-NS

375

765

64

87

48

65

38

17.2

3.4:1

1000

454

A8R311M

225

450

110

149

82

111

38

17.2

5.8:1

1000

454

A8R311M-NS

225

450

110

149

82

111

38

17.2

5.8:1

1000

454

A8R337M

109

215

226

306

167

226

51

23.1

11.9:1

1000

454

A8R338M

64

125

385

522

285

386

51

23.1

20.3:1

1000

454

A8R336M

38

75

638

865

471

639

51

23.1

33.6:1

1000

454

* Note: These motors must be operated with sufficient load to prevent speed from exceeding the maximum allowable free speed.
** Note: All models assume overhung load located at 2.25" (57.15mm) from the face of the motor.

Model Number

Stall

Torque

Starting

Torque

Maximum Overhung 

Load @ Stall **

Weight

Maximum Allowable

RPM *

Gear 

Ratio

Page 3

PL70-A8-EN

03/03/2017

Product Information

For this Instruction Manual

The original language of this manual is English and is 

intended for all persons who will operate and maintain this 

equipment.
This instruction manual has the following purposes:
• 

It provides important instructions for safe and effective 

operation.

• 

It describes the function and operation of this equipment.

• 

It serves as a reference guide for technical data, service 

intervals, and spare parts ordering.

Symbols in the text:

→ 

Id

entifies instructions to be followed.

• 

Identifies a list.

Bold

  Indicates an important feature or instruction.

Identification graphic:

¢

Indicates a directional movement.

ò

Indicates a function or force.

Declaration of Incorporation:

We  affirm  that  this  machine  complies  with  the  basic 

requirements of the following directives (2006/42/EC) 

and is intended for installation / assembly in a / with other 

machine(s). Commissioning of the incomplete machine 

is prohibited until such time that the incomplete machine 

has been incorporated in a machine that complies with the 

EC Machinery Directive 2006/42/EC and for which there 

is an EC Declaration of Conformity in accordance with 

Appendix II A. We furthermore declare that the special 

technical documention for the incomplete machine is in 

accordance with Appendix VII Part B. We undertake to have 

it passed on to the market surveillance body upon request 

by our representative for the compilation of technical 

documentation.  The following Sections of Appendix I of 

Directive 2006/42/EC have been fulfilled: 1.1.2, 1.1.3, 1.1.5, 

1.3.2,  1.3.4,  1.5.  Applied  harmonized  standards  are  ISO 

12100-1: 2004-04, ISO 12100-2:2004-04.
The name, job function and address of the person authorized 

to compile the technical file.

Mr. William Cain

Director - Global Engineering Services

Apex Tool Group

670 Industrial Drive

Lexington, SC 29072

_______________________

Signature: William Cain

Date: March 03, 2017

Copyright protection:

Apex  Tool  Group,  LLC  reserves  the  right  to  modify, 

supplement or improve this document or the product without 

prior notice. This document may not be reproduced in any 

way, shape or form, in full or parts thereof, or copied to 

another natural or machine readable language or to a data 

carrier, whether electronic, mechanical, optical or otherwise 

without the express permission of Apex Tool Group, LLC.

Safety:

Warnings and notes

Warning  notes  are  identified  by  a  signal  word  and  a 

pictogram.
•  The signal word indicates the severity and probability of 

the impending danger.

•  The pictogram indicates the type of danger.

-------------------------------------------------------------

Indicates a potentially 

hazardous

 situation 

for personal health and safety. If this warning 

is not observed, death or serious injury may 

occur.

-------------------------------------------------------------

Indicates a potentially 

hazardous

 situation 

which, if not avoided, may result in minor or 

moderate injury or property and environmental 

damage.

-------------------------------------------------------------

GENERAL NOTE

 identifies useful information 

that may include application tips but no 

hazardous situations.
-------------------------------------------------------------

Symbols on product

Be sure you understand their meaning before using this 

equipment.

-------------------------------------------------------------

Read all instructions

-------------------------------------------------------------

Eye protection must be worn at all times during 

the operation or maintenance of this tool.

-------------------------------------------------------------

Eye protection must be worn at all times during 

the operation or maintenance of this tool.

-------------------------------------------------------------

Page 4

PL70-A8-EN

03/03/2017

General Safety Instructions

These Safety Instructions are not intended to be all 

inclusive. The operator should also study and comply with 

all applicable Federal, State, and Local Regulations.

Designated Use

This pneumatic motor is to be used exclusively as a power 

source and integrated into an application or machine.

Do not modify the motor, any guard, or accessory 

unless approved in writing by Apex Tool Group, 

LLC. All safety devices must be properly installed 

and maintained in good working order.

Putting into service

Only fully trained personnel should install, adjust, operate, 

or repair this equipment.

Personal protective equipment

Exercise  caution,  pay  attention  to  what 

you  are  doing  and  act  reasonably  at  all 

times when working with a pneumatic tool. 

Never use a pneumatic tool while under the 

influence of drugs, alcohol or medication.

One moment of inattentiveness in the use of 

a pneumatic tool can cause serious injuries.

Risk of injury by being wound up in and caught by machinery:

When working with rotating parts, it is 

prohibited to wear gloves.

→ Wear close fitting clothing.
→ If necessary, wear a hair net.

Risk of injury due to ejected components:

Wear protective goggles.

Air supply

Connect the tool to a clean lubricated air supply capable 

of providing a measured maximum air supply of 90 psig at 

the tool with the tool running and the lever fully depressed. 

Make certain an air shut off valve is installed within reach of 

the motor’s workspace.

Air Line Lubrication:

Use Apex Tool Group, LLC or Apex Tool Group GmbH & Co. 

OHG’s  lightweight  air  tool  oil  500021  (available  in  quantities 

shown in the following chart) or an SAE-5 lightweight spindle oil.

Recommended Grease:

“DO NOT SUBSTITUTE LUBRICANTS”

The proper grades of oil and grease are essential for the 

efficient  operation  of  these  air  motors.  Heavy  oil  will  not 

flow  through  a  lubricator  at  a  satisfactory  rate  to  insure 

proper lubrication of the motor. Greases that are too stiff will 

channel and fail to lubricate properly and greases that are 

too thin will blow out of the motor. Improper lubrication or 

inadequate lubricants can cause extensive motor damage.

Grease fittings are located on the motor housing and gear 

housing for each stage of gearing. The following quantities 

of A123771 (High Temp 540450) grease are provided during 

factory assembly and these same amounts must be provided 

whenever the air motor is disassembled.
• 

Motor assembly: 12 oz.

• 

Gearing assembly (each): 4 oz.

During normal operation, the motor wil loose a small amount 

of grease through the exhaust making it necessary to add 

grease at regular intervals. After each 50 hours of operation 

add 2.0 oz. of A123771 (High Temp 540450) grease to the 

motor housing.

Excessive grease in the motor housing will 

cause a loss of motor performance. Not 

enough grease will cause premature motor 

failure.
Too much grease in the gear case will force 

the seal out of the front housing.

The gear case will lose grease through the motor. The 

motor will siphon gear grease, saturated with airline oil, 

through the exhaust. After 200 hours of operation, add 1.0 

oz. of A123771 (High Temp 540450) grease into each gear 

housing

Service and Repair:

Tool service and repair should be performed by an authorized 

Apex Tool Group, LLC or Apex Tool Group GmbH Service 

Center. Refer to the last page of this manual for locations.

Only  qualified  and  trained  personnel  are  to  repair  this 

equipment.
Replace worn or damaged parts using only genuine brand 

replacement parts manufactured or supplied by Apex Tool 

Group, LLC.

Immediately shut off the tool and disconnect the air supply 

if you notice unusual sound or excessive vibration. Have a 

qualified repair technician inspect the tool and repair before 

placing it back into operation.

Parameter

Description

Air Hose

Minimum inside diameter:

1/2" (12.7mm)

Maximum length: 16.4' (5 m)

Working 

pressure range Performance rated at: 90 psi (620 kPa)

Compressed air

Air quality according to ISO 8573-1, quality 

class 2.4.3

The compressed air must be clean and dry.

Part No.

Packaged

Designation

540397

1 Quart (0.94 liter)

Airlube 10W/NR-420LB DR

533485

1 US Gallon (3.78 liter)

Airlube 10W/NR-420LB DR

Part No.

Packaged

Designation

A123771

16 oz. (0.45 kg)

Shell Alvania® EP 00

540450

16 oz. (0.45 kg)

Chevron Black Pearl® EP NLGI

Product Information

Page 5

PL70-A8-EN

03/03/2017

Product Information

Maintenance

Implement a comprehensive safety maintenance program to 

provide regular inspection for all phases of motor operation 

and air supply equipment.
Daily:

• 

Visual inspection of air supply hose and connections

• 

Inspect all external motor components

• 

Inspect the motor mountings for secure and proper 

assembly.

• 

Check the motor for excessive vibration or noise.

• 

Maintain proper lubrication levels.

Weekly:

• 

Inspect the air supply hose for wear or damage.

• 

Make sure the air inlet connection is securely tightened.

• 

Make sure all motor fasteners are properly tightened.

• 

Inspect any guards (if equipped) for damage.

6 months or sooner if needed:

• 

Check individual parts and replace as necessary.

• 

Replace all o-rings and seals.

Valving

If an air valve is used with this motor, it should have a full 

flow air passage to utilize full power of the motor. For quick 

motor stops, an all-ports closed-in-neutral type valve with a 

spring return should be used.

Distributor bushing assembly

If replacement is necessary, press the new distributor 

bushing into the head as shown below. For proper alignment, 

notch “A” in the bushing must be oriented with hole “B” in the 

head as illustrated.

Duplex bearing assembly

Duplex bearing assembly on the driveshaft. The small 

diameters of the duplex bearing must face each other when 

assembled, see below.

Bevel gear timing mark

Make sure the timing mark on the bevel gear is aligned 

with the center of a piston chamber before installing the 

driveshaft assembly into the cylinder.

Disposal

Observe  and  comply  with  all  local  disposal 

guidelines for all components of this equipment 

and it’s packaging.

A8

Motor

Forward

Reverse

Off

A

B

C

D

E

Torque Output Control

A) When air enters from this side

B) it must exhaust without restrictions.

C) Four-Way valve

D) Pressure regulator

E) Air supply

A8

Motor

Forward

Reverse

Off

A

C

D

Control Forward and Reverse Speeds

A) Metered flow control (inlet)

B) Free (open) flow control (exhaust)

C) Four-Way valve

D) Air supply

Distributor

Bushing

Hole “B”

Notch “A”

0.567

0.557

Head

Dupex 

Bearing

Cylinder

Piston

Chamber

Bevel Gear

Timing Mark

Bevel

Gear

Page 6

PL70-A8-EN

03/03/2017

Page 6

Spare Parts

15

14

27

16

18

20

24

17

19

21

12

10-11 ft.lbs.

(13-15 Nm)

22

26

23

25

5

65-70 ft.lbs.

(88-95 Nm)

28

10

8

6

1

2

11

9

7

4

3

13

9-10 ft.lbs.

(12-13 Nm)

“A”

Models

A8R309M A8R336M

A8R309M-NS  A8R337M

A8R310M 

A8R338M

A8R310M-NS

A8R311M

A8R311M-NS

Power Unit

PL70-A8-EN

03/03/2017

Page 7

EN

Description

--

507491

1

Power Unit (includes Ref. 1-26)

1

A17738

1

Head Assembly (includes Ref. 2-4)

2

17749

1

1 Reducer Bushing

3

B110E

2

2 Square Head Pipe Plug (1/2-14 NPT)

4

3VR77

1

1 Distributor Bushing

5

C108S

5

10 Head Assembly Nut

6

508321

1

Distributor (includes Ref. 7-8)

7

3V43

1

1 Drive Key

8

3V235

1

3 Distributor Spring

9

OG196

1

2 Ball Bearing

10

3V169

1

Lock Nut

11

3V272

1

Washer

12

10012PT

1

3 Head Gasket

13

A3V1

1

Cylinder

14

10011

1

3 Cylinder Gasket

15

A3V180

1

1 Bevel Gear

--

542241

1

Socket Plate Assembly (includes Ref. 16-18)

16

542240

5

5 Piston Assembly

17

3V188

10

20 Socket Head Cap Screw (12-24 NC-2 x 5/16)

18

507742

1

Socket Plate

19

500741

1

3 Retaining Ring

20

507897

1

2 Duplex Ball Bearing

21

508056

1

Driveshaft

22

22G155

1

2 Ball Bearing

23

526546

1

Rear Housing (includes Ref. 24-25)

24

18364PT

1

1 Rear Housing Bearing Liner

25

526543

5

5 Rear Housing Stud (5/16-24 x 7.81)

26

30775PT

1

1 Flush Type Grease Fitting

27

530322

1

Nameplate (not included in 507491 power unit)

28

534820

2

Drive Screw (not included in 507491 power unit)

(#) Quantity

(X) Recommended Spare Parts (quantity shown based on 1-5 tools in operation)

Illustration "A": Power Unit

Ref

Number

#

X

Spare Parts

Page 8

PL70-A8-EN

03/03/2017

3

8

17

17

6

10

11

5

13

18-20 ft.lbs.

(24-27 Nm)

3

9

12

15

14

16

Models

A8R309M

A8R310M

A8R311M

2

2

1

1

7

4

Models

A8R310M

A8R311M

Model

A8R309M

L

Lubricate with A123771 Grease (16 oz. can)

L

L

L

L

L

“B”

Spare Parts

Direct Drive and Single Stage Gearing

Page 9

PL70-A8-EN

03/03/2017

EN

Description

1

525424

1

2 Ball Bearing

2

Table "B"

1

Gear Cage Output Spindle

3

10032

2

4 Planetary Gear Pin

4

18324

1

Drive Block

5

18320

1

Locating Ring

6

Table "B"

2

4 Planetary Gear (includes Ref. 7)

7

Table "B"

2

4 Planetary Gear Needle Bearing (Bushing)

8

Table "B"

1

2 Pinion Gear

9

10019

1

Ring Gear

10

DP120PT

1

2 Ring Gear Pin

11

18304

1

2 Ball Bearing

12

18307

1

3 Oil Seal

13

10010

1

3 Front Housing Gasket

14

18313

1

Front Housing

15

30775PT

1

1 Flush Type Grease Fitting

16

B119S

6

6 Socket Head Cap Screw (5/16-18 x 2-1/2)

17

18326

1

3 Output Spindle Key

(#) Quantity

(X) Recommended Spare Parts (quantity shown based on 1-5 tools in operation)

Illustration "B": Direct Drive and Single Stage Gearing Assemblies

Ref

Number

#

X

Table "B"

Ref.

Description

#

A8R309M

#

A8R310M

#

A8R311M

2 Gear Cage Output Spindle

1

544039

1

544039

1

544024

6 Planetary Gear

----

2

A18322 (14T)

2

540766 (19T)

7 Needle Bearing (Bushing)

----

2

21155

2

845845

8 Pinion Gear

----

1

18323

----

(T) Teeth

Spare Parts

Page 10

PL70-A8-EN

03/03/2017

Spare Parts

3

8

17

17

6

10

11

5

13

18-20 ft.lbs.

(24-27 Nm)

3

9

12

15

14

16

Models

A8R309M-NS

A8R310M-NS

A8R311M-NS

2

2

1

1

7

4

Models

A8R310M-NS

A8R311M-NS

Model

A8R309M-NS

L

Lubricate with A123771 Grease (16 oz. can)

L

L

L

L

L

“C”

Direct Drive and Single Stage Gearing

Page 11

PL70-A8-EN

03/03/2017

Spare Parts

EN

Description

1

525424

1

2 Ball Bearing

2

Table "C"

1

Gear Cage

3

10032

2

4 Planetary Gear Pin

4

18324

1

Drive Block

5

18320

1

Locating Ring

6

Table "C"

2

4 Planetary Gear (includes Ref. 7)

7

Table "C"

2

4 Planetary Gear Needle Bearing (Bushing)

8

Table "C"

1

2 Pinion Gear

9

10019

1

Ring Gear

10

DP120PT

1

2 Ring Gear Pin

11

18304

1

2 Ball Bearing

12

18307

1

3 Oil Seal

13

10010

1

3 Front Housing Gasket

14

18313

1

Front Housing

15

30775PT

1

1 Flush Type Grease Fitting

16

B119S

6

6 Socket Head Cap Screw (5/16-18 x 2-1/2)

17

512089

1

3 Gear Cage Key

(#) Quantity

(X) Recommended Spare Parts (quantity shown based on 1-5 tools in operation)

Illustration "C": Direct Drive and Single Stage Gearing Assemblies - No Spindle

Ref

Number

#

X

Table "C"

Ref.

Description

#

A8R309M-NS

#

A8R310M-NS

#

A8R311M-NS

2 Gear Cage

1

18318

1

18318

1

18321

6 Planetary Gear

----

2

A18322 (14T)

2

540766 (19T)

7 Needle Bearing (Bushing)

----

2

21155

2

845845

8 Pinion Gear

----

1

18323

----

(T) Teeth

Page 12

PL70-A8-EN

03/03/2017

3

7

6

11

8

2

10

18

14

16

15

12

23

19

21

17

22

9

20

4

L

Lubricate with A123771 Grease (16 oz. can)

L

L

L

L

L

L

5

1

18-20 ft.lbs.

(24-27 Nm)

13

12

L

13

18-20 ft.lbs.

(24-27 Nm)

“D”

25

24

Models

A8R336M

A8R337M

A8R338M

Spare Parts

Double Stage Gearing

Page 13

PL70-A8-EN

03/03/2017

EN

Description

1

525424

1

2 Ball Bearing

2

Table "D"

1

Gear Cage

3

10032

2

4 Planetary Gear Pin

4

Table "D"

2

4 Planetary Gear (includes Ref. 5)

5

Table "D"

2

4 Planetary Gear Needle Bearing (Bushing)

6

Table "D"

1

2 Pinion Gear

7

30075

1

2 Ball Bearing

8

10019

1

Ring Gear

9

DP120PT

1

2 Ring Gear Pin

10

10010

1

3 Center Housing Gasket

11

30050

1

Center Housing

12

30775PT

2

2 Flush Type Grease Fitting

13

B127D

12

12 Socket Head Cap Screw (5/16-18 x 3)

14

30076PT

1

2 Ball Bearing

15

Table "D"

1

Output Gear Cage

16

30058PT

2

4 Planetary Gear Pin

17

Table "D"

2

4 Planetary Gear (includes Ref. 18)

18

11700

4

8 Planetary Gear Needle Bearing

19

30063PT

1

2 Ball Bearing

20

30056PT

1

Ring Gear

21

30049

1

Front Housing

22

30057PT

1

3 Oil Seal

23

30072PT

1

3 Output Gear Cage Key

24

30053PT

1

Output Spindle

25

30071PT

1

3 Output Spindle Key

(#) Quantity

(X) Recommended Spare Parts (quantity shown based on 1-5 tools in operation)

Illustration "D": Double Stage Gearing Assembly

Ref

Number

#

X

Table "D"

Ref.

Description

#

A8R336M

#

A8R337M

#

A8R338M

2 Gear Cage

1

30060

1

30052PT

1

30739PT

4 Planetary Gear

2

540766 (19T)

2

A18322 (14T)

2

540766 (19T)

5 Needle Bearing (Bushing)

4

845845

4

21155

4

845845

6 Pinion Gear

----

1

18323

----

15 Gear Cage Output Spindle

1

30059

1

30051

1

30051

17 Planetary Gear

2

A30061 (21T)

2

A30055 (16T)

2

A30055 (16T)

(T) Teeth

Spare Parts

Please note that all locations may not service all products.
Contact the nearest Apex Tool Group Sales & Service Center for the appropriate facility 
to handle your service requirements.

POWER TOOLS SALES & SERVICE CENTERS

Apex Tool Group, LLC

1000 Lufkin Road

Apex, NC 27539

Phone: +1 (919) 387-0099

Fax: +1 (919) 387-2614

www.apexpowertools.com

EUROPE  |  MIDDLE EAST  |  AFRICA

Hungary

Apex Tool Group

Hungária Kft.

Platánfa u. 2

9027 Györ

Hungary

Phone: +36 96 66 1383

Fax: +36 96 66 1135

NORTH AMERICA  |  SOUTH AMERICA

Lexington, South Carolina

Apex Tool Group

670 Industrial Drive

Lexington, SC 29072

Phone: +1 (800) 845-5629

Phone: +1 (919) 387-0099

Fax: +1 (803) 358-7681

Canada

Apex Tool Canada, Ltd.

7631 Bath Road

Mississauga, Ontario L4T 3T1

Canada

Phone: (866) 691-6212

Fax: (905) 673-4400

Mexico

Apex Tool Group

Manufacturing México 

S. de R.L. de C.V.

Vialidad El Pueblito #103

Parque Industrial Querétaro

Querétaro, QRO 76220

Mexico

Phone: +52 (442) 211 3800

Fax: +52 (800) 685 5560

Detroit, Michigan

Apex Tool Group

2630 Superior Court

Auburn Hills, MI 48236

Phone: +1 (248) 393-5640

Fax: +1 (248) 391-6295

Brazil

Apex Tool Group

Ind. Com. Ferram, Ltda.

Av. Liberdade, 4055

Zona Industrial Iporanga

Sorocaba, São Paulo

CEP# 18087-170

Brazil

Phone: +55 15 3238 3820

Fax: +55 15 3238 3938

ASIA PACIFIC

India

Apex Power Tools India

Private Limited

Gala No. 1, Plot No. 5

S. No. 234, 235 & 245

Indialand Global 

Industrial Park

Taluka-Mulsi, Phase I 

Hinjawadi, Pune 411057

Maharashtra, India

Phone: +91 020 66761111

Australia

Apex Tool Group

519 Nurigong Street, Albury 

NSW 2640

Australia

Phone: +61 2 6058 0300

China

Apex Power Tool Trading

(Shanghai) Co., Ltd

2nd Floor, Area C

177 Bi Bo Road

Pu Dong New Area, Shanghai

China 201203 P.R.C.

Phone: +86 21 60880320

Fax: +86 21 60880298

Japan

Apex Tool Group Japan

Korin-Kaikan 5F,

3-6-23 Shibakoen, Minato-Ku,

Tokyo 105-0011, JAPAN

Phone: +81-3-6450-1840

Fax: +81-3-6450-1841

Korea

Apex Tool Group Korea

#1503, Hibrand Living Bldg., 

215 Yangjae-dong,

Seocho-gu, Seoul 137-924,

Korea

Phone: +82-2-2155-0250

Fax: +82-2-2155-0252

PL70-A8-EN  |  0317  |   © 2017 Apex Tool Group, LLC  |  Printed in USA

England

Apex Tool Group GmbH

C/O Spline Gauges

Piccadilly, Tamworth

Staffordshire B78 2ER

United Kingdom

Phone: +44 1827 8727 71

Fax: +44 1827 8741 28

France

Apex Tool Group S.A.S.

25 rue Maurice Chevalier

B.P. 28

77831 Ozoir-La-Ferrière

Cedex, France

Phone: +33 1 64 43 22 00

Fax: +33 1 64 43 17 17

Germany

Apex Tool Group GmbH

Industriestraße 1

73463 Westhausen

Germany

Phone: +49 (0) 73 63 81 0

Fax: +49 (0) 73 63 81 222

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