SERVICE KIT INSTALLATION
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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
Gast will NOT guarantee field-rebuilt product performance.
For performance guarantee, the product must be returned
to a Gast Authorized Service Facility.
Disassembly
To make reassembly easier, note the location of parts when
disassembling.
1. Disconnect electrical power to pump.
2. Disconnect air supply and vent all air lines to release
pressure or vacuum.
3. Note the direction of the arrows so you can orient
the pump head correctly during reinstallation.
4. Remove the four corner head screws and remove
the head, valve and valve plate.
5. Remove retainer plate and diaphragm.
6. Clean the pump using water-based solvents.
CAUTION: Do not use petroleum-base
compounds, acids, caustics or chlorinated solvents to clean
or lubricate parts. It will reduce service life of unit.
4
Solvent Cleaning
Use only Gast AH255B Solvent or other
non-petroleum based solvent. Do Not use kerosene or
ANY other combustible solvent to clean product.
WARNING
May contain solid or liquid material
that can result in eye or skin damage.
Wear eye protection when using this product.
Solvent Stream
Reassembly
1. Reattach retainer plate and diaphragm to rod with
retainer screw
2. Torque screw to 12 in-lbs.
3. Re-install valve plate, valve and head.
4. Re-install head screws and torque to 12 in-lbs.
CAUTION:
Do not over-tighten head screw(s). To do so can
damage unit and will reduce performance.
If pump still does not produce proper vacuum or pressure,
send unit to a Gast Authorized Service Facility for repair.
SHUTDOWN PROCEDURES
It is your responsibility to follow proper shutdown
procedures to prevent product damage.
NEVER ADD OIL TO THIS OIL-LESS PUMP.
Proper shutdown procedures must be followed to
prevent pump damage. Failure to do so may result in
premature pump failure. Follow all the steps to
assure correct storage and shutdown between
operating periods.
It is your responsibility to:
• Regularly inspect and make necessary repairs to
product in order to maintain proper operation.
• Make sure that pressure and vacuum are released
from product before starting maintenance.
Injury Hazard
Product surfaces become very hot during operation,
allow product surfaces to cool before handling.
Air stream from product may contain solid or liquid
material that can result in eye or skin damage,
wear proper eye protection.
Clean this product in a well ventilated area.
Failure to follow these instructions can result in
burns, eye injury or other serious injury.
WARNING
1. Disconnect plumbing.
2. Operate product for at least 5 minutes without
plumbing.
3. Disconnect power supply.
4. Plug open ports to prevent dirt or other
contaminants from entering product.