Graco LD Series, Instructions Manual

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Troubleshooting
3A1334P 25
Grease Models
Pump fails to operate
Inadequate air supply pressure or
restricted air lines Increase air supply and/or clear
restriction.
Closed or clogged pump valves Open and/or clean.
Clogged fluid line, hose, valve, or
other accessory Relieve pressure .
Clear obstruction.
Damaged air motor
Assess damage, and service air
motor.
Exhausted fluid supply Refill and reprime or flush.
Continuous air exhaust through muf-
fler
Worn or damaged piston o-ring or
valve cup Assess wear or damage, and service
air motor.
Ice build up on the valve plate allows
air leakage past valve u-cup sealing
surface
Lower compressed air dewpoint.
Increase compressed air tempera-
ture.
Decease air pressure.
Increase ambient room temp.
Erratic pump operation
Exhausted fluid supply Refill and reprime or flush.
Worn pump seals Replace.
Damaged shovel tube Replace.
Damaged check seat
Replace pump piston or shovel rod
(or other damaged part).
Errataic or accelerated pump speed
Exhausted fluid supply Refill and reprime of flush.
Fluid too heavy for pump priming Use inductor or follow plate.
Damaged valve gasket
Replace valve gasket.
Lower air pressure to prevent reoc-
currence.
Pump operates but output is low
Worn piston seal Replace.
Damaged upper check seat Replace pump piston.
Worn fluid intake seal Replace.
Damaged lower check seat Replace shovel rod.
Inadequate air supply pressure or
restricted air lines Increase air supply and/or clear
restriction.
Partially closed or clogged pump
valves
Open and/or clean.
Air pockets in the grease inlet Eliminate the air pockets.
Partially clogged fluid line, hose,
valve, or other accessory Relieve pressure .
Clear obstruction.
Worn seals Replace.
Grease leaking from muffler Worn throat seal Replace.