Troubleshooting - Graco Merkur W10CAS Assembly

Troubleshooting

Troubleshooting
Relieve the pressure before checking or servicing
the equipment.
Problem
Pump output low on both strokes.
Pump output low on only one stroke.
No output.
Pump operates erratically.
Pump will not operate.
14
NOTE: Check all possible problems and causes before
disassembling the pump.
Cause
Restricted air supply lines.
Exhausted fluid supply.
Clogged fluid outlet line, valves, etc.
Worn piston packing.
Held open or worn ball check valves.
Worn piston packings.
Improperly installed ball check valves.
Exhausted fluid supply.
Held open or worn ball check valves.
Worn piston packing.
Restricted air supply lines.
Exhausted fluid supply.
Clogged fluid outlet line, valves, etc.
Damaged air motor.
Fluid dried on piston rod.
Runaway solenoid has tripped.
Solution
Clear any obstructions; be sure all shutoff
valves are open; increase pressure, but do
not exceed maximum working pressure.
Refill and reprime pump.
Clear.
Replace. See displacement pump manual
312792.
Check and repair.
Replace.
Check and repair.
Refill and reprime pump.
Check and repair.
Replace.
Clear any obstructions; be sure all shut off
valves are open; increase pressure, but do
not exceed maximum working pressure.
Refill and reprime pump.
Clear.
See air motor manual 312796.
Disassemble and clean pump. See page 15
and manual 312792. In future, stop pump at
bottom of stroke.
Retract solenoid. See air motor manual
312796.
312794F