11
General Information:
The product nameplate specifies all information required
when ordering parts or requests for information. The
type of lubricant required for unit is also specified on the
nameplate.
STANDARD & WORM GEAR REDUCERS - OPERATING AND MAINTENANCE INSTRUCTIONS
Product Use Criteria:
• All worm gear reducers require that the air motor be
mounted so that the intake and exhaust piping is at a
90º angle to the centerline of the reducer output shaft.
• Gear motors are NOT self-locking. If a brake is
required for safety (for air pressure failure, etc.)
contact your Gast representative.
• Worm gear reducers are shipped with a plug in the top
pipe plug. The plug must be removed and the breather
plug installed for proper operation.
• Operating an air motor without venting will create
internal pressure build-up which can damage the
internal parts of gear motor.
• Check the oil level in units which have been stored or
not operated for a period of time.
• Gear motors require proper lubrication. Insufficient oil
level can cause loss of performance, damage or failure
of the gear motor.
Model GR11 GR20 GR25
Speed Range 33.3 to 400 RPM 30 to 300 RPM 20 to 200 RPM
(Reducer Output Shaft)
Gear Reduction 15:1 10:1 15:1
Maximum Allowable 100 lbs./45,4 kg 200 lbs/90,8 kg @300 250 lbs/113,5 kg at 200
End Thrust With RPM to 800 lbs/363,2 kg RPM to 800 lbs/363,2 kg
Zero Overhung Load. at 30 RPM at 20 RPM
(Reducer Output Shaft)
Maximum Allowable 100 lbs/45,4 kg at 333 200 lbs/90,8 kg at 300 200 lbs/90,8 kg at 200
Overhung Load With RPM to 200 lbs/90,8 kg RPM to 600 lbs/272,4 kg RPM to 600 lbs/272,4 kg
Zero End Thrust. at 33.3 RPM at 30 RPM at 20 RPM
(Reducer Output Shaft)
Lubrication Use a 300 ssu at 100˚F/38˚C turbine quality lubricant – Gast #AG292A, Gulf Harmony
53, Shell Tellus 33, Socony DTE heavy medium or Humble Nuto 53.
For horizontal operation, remove both plugs and add oil to top hole until
other hole overflows.
For vertical operation, fill to overflow point of uppermost hole.
Gear Reducer Specifications
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
Change output shaft direction
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.
Service, Parts or Repair
For service, parts or repair of the worm gear reducer,
contact the manufacturer listed on the nameplate.
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