7
TROUBLESHOOTING GUIDE
SERVICE KIT INSTALLATION
NOTE: Gast will not guarantee performance of a field-
rebuilt unit. Return unit to a Gast Authorized Service
facility, or perform rebuild procedures described below.
Kits contain most or all of the following: Head Gasket, Valve
Plate Assembly, Retainer Plate Screws, O-ring, and Cup.
Kits are used for several models and may contain extra
parts not applicable for your specific model. Refer to
exploded view.
Disassembly:
1. Disconnect unit from power source.
m
WARNING Disconnect power before servicing to
avoid electric shock.
2. Vent all air lines to unit to remove pressure.
m
WARNING Vent all air lines to unit to remove pressure
before servicing it. Failure to do so can
result in severe personal injury.
3. Remove head bolts.
4. Remove gasket, head, and valve plate assembly
(Note orientation of head assembly for re-assembly).
5. Carefully remove cylinder and shims (Be sure to
replace all shims, as they are matched to cylinder and
rod assembly height dimensions). Remove two retainer
plate screws on retainer plate (may require heat to
break adhesive on retainer screws) and discard old cup.
6. Clean residue from cylinder walls with soft cloth
using non-petroleum, non-oil-based solvent. DO NOT
use kerosene, gasoline, or any flammable substance.
Re-assembly:
7. Replace cylinder and shims.
8. Place retainer plate in new cup and push both down
into cylinder.
9. Install new retainer plate screws and torque to 35 in-lbs.
10. Install O-ring into groove of cylinder
11. Install valve plate, head gasket (note gasket orientation),
and head, on cylinder so ports are in original orientation.
12. Install and snug all head bolts and torque to 80 in-lbs.
NOTE: Before putting unit into service, ensure that any
external accessories such as relief valves and
gauges attached to head have not been damaged.
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