Gast 4AM (SS) - Manual (Page 5)

5
Gast will NOT guarantee field-rebuilt product
performance. For performance guarantee, the product
must be returned to a Gast Authorized Service Facility.
SERVICE KIT INSTALLATION
Service Kit contents vary. Most contain vanes, end cap
gasket, body gasket, bearings and a muffler element or
felt.
Rebuilds
Tool kits which include a more in-depth rebuild manual
are available through your Gast
Distributor/Representative. These kits include the tools
required to remove and reassemble end plates,
bearings and shaft seals, and to set the proper end
clearance. The rebuild manual also includes step by
step instructions, including illustrations, to help achieve
a successful rebuild. Gast highly recommends using
the air motor rebuild manual and tool kit when
attempting a minor or major rebuild to your Gast air
motor.
Minor Rebuild:
1. Remove the end cap.
2. Remove dead end plate bolts.
3. Remove dead end plate using factory issued tool,
(do NOT use screwdriver to remove the end plate).
4. Remove vanes.
5. Clean parts. Check for scoring on the end plate
and rotor assembly. If scoring exists, send unit to
a Gast authorized service facility.
7. Place the dead end plate on the body.
8. Place the bearing onto the shaft using a factory
supplied bearing pusher.
9. Install end plate bolts. Check to make sure the end
plate does not bind - it should allow a small amount
of movement. Tighten bolts to 60-80 in-lbs.
10. Use the bearing tapper from kit to lightly tap on the
inner race of the dead end bearing to free up and
center the rotor in the body; the rotor should not rub
on either end plate when pushed or pulled.
11. Reattach the end cap.
12. Lubricated models only: add a few drops of oil
into the ports and rotate shaft by hand for a few
rotations.
Major Rebuild:
For major repairs, it is recommended that the unit be sent
to a Gast authorized service facility.
Disposal (Please note current regulations)
Parts of the air motor may be recycled as scrap
metal.