Graco 25T818, Instructions, Repair And Parts

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Troubleshooting
14 3A8571A
Troubleshooting
1. Follow Pressure Relief Procedure , page 11,
before checking or repairing the equipment.
2. Check all possible problems and causes before
disassembling the equipment.
Problem Cause Solution
Motor is running, but the pump
will not prime.
The pump lost the prime. Refer to Priming , page 10.
There is dirt under the pressure relief valve. Remove the pressure relief valve and
inspect. Clean or replace the pump
housing assembly.
The gears are worn or damaged. Remove the pump body and inspect the
gears. If damaged, replace the pump
housing assembly.
The oil level is low. Refill or replace the tank.
There is an air leak in the suction tube. Inspect all joints in the suction tube
making sure that all threaded joints have
sealant applied properly.
There is an air lock in the system. Fill the system with fluid by keeping
nozzle open by operating the pump.
The motor does not run at the proper speed. Check the electric connections.
Ensure the supply voltage is at the proper
level.
Oil is leaking in the motor
mount.
A faulty or damaged motor shaft seal. Replace the pump housing assembly.
Pressure switch is not activating.
Pressure relief is relieving pressure internally. Pressure switch is faulty.
Replace the pump outlet assembly with
new pressure switch.
Dirt is under the pressure relief valve.
Remove the pressure relief valve and
inspect. Clean or replace the pump
housing assembly.
A worn motor shaft. Replace with a new pump.