Troubleshooting
3A9031A
31
Pump output is low
Pump rod damage.
Repair pump. See pump
manual.
Low stall pressure (pressure
setting too low).
Turn pressure knob fully
clockwise. Make sure pressure
control knob is properly
installed to allow full clockwise
position. If problem persists,
replace pressure control.
Piston packings are worn or
damaged.
Replace packings. See pump
manual.
O-ring in pump is worn or
damaged.
Replace o-ring. See pump
manual.
Intake valve ball is packed with
material.
Clean intake valve. See pump
manual.
Large pressure drop in hose
with heavy materials.
Reduce overall length of hose.
Motor runs but pump does not
stroke
Connecting rod assembly
damaged. See pump manual.
Replace connecting rod
assembly. See pump manual.
Gears or drive housing
damaged.
Inspect drive housing
assembly and gears for
damage and replace if
necessary.
Excessive paint leakage into
throat packing nut
Throat packing nut is loose.
Remove throat packing nut
spacer. Tighten throat packing
nut just enough to stop
leakage.
Throat packings are worn or
damaged.
Replace packings. See pump
manual.
Displacement rod is worn or
damaged.
Replace rod. See pump
manual.
Fluid is spitting from gun
Air in pump or hose.
Check and tighten all fluid
connections. Cycle pump as
slowly as possible during
priming.
Spray tip is partially clogged.
Clear tip. See
Fluid supply is low or empty.
Refill fluid supply. Prime
pump. See pump manual.
Check fluid supply often to
prevent running pump dry.
Problem
What to Check
If check is OK, go to next
check
What to Do
When check is not OK,
refer to this column
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