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© 2019, Gast Manufacturing

We reserve the right to make any alterations which may be due to any technical improvements

Printed in the USA

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Change output shaft direction of worm gear reducers

1.   Remove drain plug and drain oil from unit.
2.   Remove end cover and seal cage cap screws. While supporting 

output shaft, remove end cover and shims from unit. Keep 
shims with cover.

3.   Remove output shaft and seal cage together from extension 

side. Keep shims with seal cage.

4.   Insert seal cage, shims and sub-assembly into housing from 

the side opposite from which they were removed.

5.   Insert seal cage cap screws and tighten with light pressure.
6.   Assemble end cover with shims. Insert end cover cap screws 

and tighten with light pressure.

7.   Turn high speed shaft in both directions to check that gear train 

is running freely.

8.   Cross-tighten seal cage and end cover cap screws.

Worm Gear Reducer Series A-F
Gear Reducer Specifications

All output shafts are in the standard location.

Model

Air Motor

Ratio

AG803

4AM

20:1

AG805

4AM

40:1

AG807

4AM

60:1

AG809

6AM

10:1

AG811

6AM

20:1

AG816

8AM

20:1

Service, Parts, or Repair

For service, parts or repair of the worm gear reducer, contact the 
manufacturer listed on the nameplate.

Part No. 45-200 D170PL (Rev. S)

TROUBLESHOOTING GUIDE

Problem

Reason and Remedy for Problem

Low Torque

Low Speed

Won’t Run

Runs Hot

Runs Well 
Then Slows 
Down

Dirt or foreign material present. Inspect and flush.

Internal rust. Inspect and flush.

Low air pressure. Increase pressure.

Air line too small. Install larger line(s).

Restricted exhaust. Inspect and repair.

Motor is jammed. Have motor serviced.

Air source inadequate. Inspect and repair.

Air source too far from motor. Reconfigure setup.

Summary of Contents for Gast 4AM Series

Page 1: ...100 psi 7 bar LL and NLP Models Pressure 1AM 80 psi 5 5 bar 1UP 65 psi 4 9 bar 2AM 80 psi 5 5 bar 4AM 80 psi 5 5 bar 6AM 80 psi 5 5 bar 8AM 80 psi 5 5 bar 16AM 80 psi 5 5 bar Product Use Criteria Non...

Page 2: ...specifications regarding explosion protection safety and accident prevention Complete the following checklist prior to starting installation in a hazardous area All actions must be completed in accor...

Page 3: ...t a 4 way valve with piping to both air ports of motor to make reversing possible Connect the sound absorber on the exhaust air port or valve connection Do not add any thrust to the end or side of the...

Page 4: ...ve dirt foreign particles moisture or oil that occurs in the operating environment will help to maintain proper vane performance Flush the motor if it is operating slowly or inefficiently Use only Gas...

Page 5: ...safety as in the case of air pressure failure etc contact your Gast Distributor Representative Some worm gear reducers may be shipped with a plug in the top pipe plug The plug must be removed and the...

Page 6: ...shaft in both directions to check that gear train is running freely 8 Cross tighten seal cage and end cover cap screws Worm Gear Reducer Series A F Gear Reducer Specifications All output shafts are in...

Page 7: ...OR RE PLACEMENT GAST WILL NOT BE RESPONSIBLE OR LIABLE FOR INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND however arising including but not limited to those for use of any products loss of time inconve...

Page 8: ...Kingdom Phone 44 0 1527 504040 Fax 44 0 1527 525262 Registered Trademark Trademark of Gast Manufacturing Inc Copyright 2019 Gast Manufacturing Inc All Rights Reserved www gastmfg com ISO 9001 CERTIFI...

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