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
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. This Gast Manufacturing
Laboratory Oil-Less Diaphragm Vacuum Pump and
Compressor is constructed of ferrous metals or
aluminum which are subject to rust and corrosion when
pumping condensable vapors such as water. Follow all
the steps to assure correct storage and shutdown
between operating periods.
Check that all external accessories such as relief
valves and gauges are attached to cover and are not
damaged before re-operating product.
1. Remove the four screws in the top of the product.
Remove the top plate.
2. Remove filters and clean with Gast AH255B solvent
or other non-petroleum based solvent. Use
compressed air to dry filters and make sure that all
moisture is removed. Reinstall filters.
3. Inspect head and O-ring for damage.
4. Reinstall head and valve plate with four screws.
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
Check intake and exhaust filters after first 500 hours of
operation. Clean filters and determine how frequently
filters should be checked during future operation. This
one procedure will help to assure the product’s
performance and service life.
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.
Gast will NOT guarantee field-rebuilt product
performance. For performance guarantee, the
product must be returned to a Gast Authorized
Service Facility.
Service Kit contents vary. Most contain gaskets, valves
and filter parts.
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. Label pressure gauge, vacuum gauge and pump
ports. Remove gauges if they interfere with head
bolt removal.
4. Remove the four fasteners that hold the handle and
head assembly in place. Lift washers and handle off
studs on the back of unit. Remove head and valve
plate from pump.
Replacing Diaphragm
1. Remove the two Phillips-head screws then the
retainer plate and diaphragm.
2. Install the new diaphragm over the ring on the
connecting rod. Place the pattern side up.
3. Apply Loctite® 222MS thread locker to the screws.
Replace the retainer plate and attach with the two
screws. Torque the screws to 30 in-lbs. Remove
any excess Loctite®.
1. Disconnect plumbing.
2. Operate product for at least 5 minutes without
plumbing.
3. Run at maximum vacuum for 10 to 15 minutes.
4. Repeat step 2.
5. Disconnect power supply.
6. Plug open ports to prevent dirt or other
contaminants from entering product.
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