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Troubleshooting
12
308352E
* To determine if the fluid hose or dispense valve is
obstructed
:
1. Follow the
2. Disconnect the fluid hose and place a container at
the pump fluid outlet to catch any fluid.
3. Turn on the air just enough to start the pump. If the
pump starts when the air is turned on, the
obstruction is in the fluid hose or dispense valve.
NOTE:
If you experience air motor icing, call your Graco
distributor.
Pump operates, but output is low on
downstroke.
The fluid is too heavy for pump
priming.
Use the bleeder valve or a ram.
Follow the
The intake valve or seals are held
open or worn.
Clear the valve and replace seals.
Pump operates, but output is low on
upstroke
The piston valve or seals are held
open or worn.
Clear the valve and replace seals.
Erratic or accelerated pump speed
The fluid supply is exhausted.
Refill and prime.
The fluid is too heavy for pump
priming.
Use the bleeder valve or a ram.
Follow the
The piston valve or seals are held
open or worn.
Clear the valve and replace seals.
The priming piston is held open or
worn.
Clear and service the piston.
Packing in the displacement pump
are worn.
Replace the packings.
Problem
Cause
Solution