Grease Models - Graco LD Series Instructions Manual

Grease Models

Pump fails to operate
Continuous air exhaust through muf-
fler
Erratic pump operation
Errataic or accelerated pump speed
Pump operates but output is low
Grease leaking from muffler
3A1334P
Inadequate air supply pressure or
restricted air lines
Closed or clogged pump valves
Clogged fluid line, hose, valve, or
other accessory
Damaged air motor
Exhausted fluid supply
Worn or damaged piston o-ring or
valve cup
Ice build up on the valve plate allows
air leakage past valve u-cup sealing
surface
Exhausted fluid supply
Worn pump seals
Damaged shovel tube
Damaged check seat
Exhausted fluid supply
Fluid too heavy for pump priming
Damaged valve gasket
Worn piston seal
Damaged upper check seat
Worn fluid intake seal
Damaged lower check seat
Inadequate air supply pressure or
restricted air lines
Partially closed or clogged pump
valves
Air pockets in the grease inlet
Partially clogged fluid line, hose,
valve, or other accessory
Worn seals
Worn throat seal
Troubleshooting
Increase air supply and/or clear
restriction.
Open and/or clean.
Relieve pressure.
Clear obstruction.
Assess damage, and service air
motor.
Refill and reprime or flush.
Assess wear or damage, and service
air motor.
Lower compressed air dewpoint.
Increase compressed air tempera-
ture.
Decease air pressure.
Increase ambient room temp.
Refill and reprime or flush.
Replace.
Replace.
Replace pump piston or shovel rod
(or other damaged part).
Refill and reprime of flush.
Use inductor or follow plate.
Replace valve gasket.
Lower air pressure to prevent reoc-
currence.
Replace.
Replace pump piston.
Replace.
Replace shovel rod.
Increase air supply and/or clear
restriction.
Open and/or clean.
Eliminate the air pockets.
Relieve pressure.
Clear obstruction.
Replace.
Replace.
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