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SERVICE KIT INSTALLATION & TROUBLESHOOTING GUIDE
SHUT-DOWN PROCEDURES
Proper shutdown procedure must be followed to prevent
damage. Failure to do so may result in premature unit failure.
Gast Manufacturing Laboratory units are constructed of
ferrous metals, which are subject to rust and corrosion when
pumping condensable vapors such as water.
This unit requires lubrication. Failure to maintain proper
oil level (10 wt. H.D./Gast part #AD220) in reservoir will
cause unit to malfunction.
Follow these steps below to assure correct shutdown
and storage between use:
1. Disconnect plumbing after using unit.
2. Allow unit to run open for at least 5 minutes.
3. Refill oil reservoir to proper level.
4. Cover inlet port (vacuum side) and run unit for 1-3
minutes.
5. Shutdown unit under vacuum.
6. Disconnect unit from power source.
7. Plug open ports to prevent dirt or other contaminants
from entering unit.
Unit is ready for storage.
SERVICE KIT INSTALLATION
Note: Gast will not guarantee performance of a field-rebuilt
unit. Return unit to a Gast Authorized Service
Facility, or perform following rebuild procedures.
Service kit contains four vanes, filter element, element
gasket, jar gasket, cover gasket, three filter felts, separator
felt, and wick.
Follow these steps to install kit.
Pump Disassembly
m
WARNING
Disconnect unit from power source and
vent all air lines to unit to remove pressure
before servicing it. Failure to do so can
result in severe personal injury or death.
1. Remove muffler jar and muffler assembly.
2. Remove filter jar and filter assembly.
3. Remove six (6) Phillips-head screws from end plate.
4. Remove end plate.
5. Remove old vanes in rotor.
6. Clean unit with solvent (Gast Part # AH255B).
7. Check exposed surfaces of rotor, vanes, pump body,
and end plate for scoring.
•
If no scoring, continue with service kit installation.
•
If severe damage, return unit to closest Authorized
Service Facility.
Pump Re-assembly
8. Re-lubricate inside of unit with 5-6 drops of oil.
9. Install new vanes supplied with kit. Be careful to install
vanes into rotor with machined surface toward body bore.
10. Re-install unit end plate with six (6) Phillips-head
screws. Torque screws to 40 in-lb.
11. Re-install new filter element on support stem.
12. Insert one end of wick up through assembly center.
13. Bend upper
3
/
4
" of wick 90˚.
14. Insert it into exit port as filter assembly is replaced.
15. Bend lower end 90˚ so it lies submerged in oil at
bottom of jar.
16. Clean jar and element with solvent.
17. Install jar gasket.
18. Re-assemble muffler element.
