Gast 6066 Series - Manual (Page 5)

Disassembly
1. Remove the dead end shroud , fan and fan spacer.
2. Use a wheel puller to remove the dead-end plate
and bearing from the pump body. Note the
direction of the bevel edge on the vane. Do not
damage the dowel pins between the end plate and
the body. Save the bearing spacer on the dead-
end of the shaft for reassembly. Remove the
snap ring from the end plate. Save the snap ring,
belleville springs and washer for reassembly.
3. Remove the bearing from the dead-end plate.
4. Check the exposed surfaces of the rotor, body, and
end plate for scoring. If you find no scoring, you can
perform a Minor Rebuild to replace only the vanes
and the dead-end bearing. If you find severe
damage, perform the Major Rebuild.
5
Minor Rebuild
5. Install the new vanes supplied with the kit. Be
careful to face the vane bevels in the proper
direction (as noted in step 2).
6. Place end plate over the shaft with dowel pins
aligned. Place bearing spacer on dead end of
shaft. Place the new bearing in its bore in the
dead end plate. Be careful to press only on the
inner bearing race.
7. Install and tighten the pump body bolts, install the
belleville springs with the washer between them
and the snap ring.
Major Rebuild
5. Remove the drive end cap. Use a wheel puller to
remove the drive-end plate and bearing from the
body. Do not remove or damage the dowel pins
in the body. Save the bearing spacer and end plate
gasket for reassembly.
6. Place one shoulder ring in its seat in the drive-end
plate, then place one of the new bearings in the
seat. Using an arbor press, press the bearing onto
the shaft. Be careful to press only on the inner
bearing race. Tighten the pump body bolts.
7. Install the new vanes supplied with the kit. Be
careful to face the vane bevels in the proper
direction (as noted in step 2).
8. Perform step #6 from Minor Rebuild.
9. Install the belleville springs with the washer between
them and the snap ring. Install and tighten the
pump body bolts.
10. Apply a thread-lock adhesive and start the drive-
end cap into its thread in the drive-end plate, but
do not tighten it.
11. Place a dial indicator against the dead-end of the
shaft to measure axial movement.Tighten the drive-
end cap until the indicator shows:
.002” - .003” of shaft movement against the belleville
springs.
12. Clean and reinstall filter(s).
Gast will NOT guarantee field-rebuilt product per-
formance. For performance guarantee, the product
must be returned to a Gast Authorized Service
Facility.
Service Kit contents vary. Most contain vanes, gaskets
and filter parts.
SERVICE KIT INSTALLATION
Ꮨ
Disconnect electrical power supply cord before
installing Service Kit.
If product is hard wired into system, disconnect
electrical power at the circuit breaker or fuse box
before installing Service Kit.
Disconnect air supply and vent all air lines to
release pressure or vacuum.
Failure to follow these instructions can result in
death, fire or electrical shock.
WARNING
Electrical Shock Hazard
Do Not attempt to remove the rotor. It is held in
place by Loctite and can only be serviced by a Gast
Authorized Service Facility.
Do Not loosen or adjust motor thru-bolts to prevent
misalignment and damage to the pump.