Troubleshooting
3A4147B
25
Pump output is low
Pump rod damage
Repair pump. See pump manual.
Low stall pressure
Turn pressure knob fully clockwise.
Make sure pressure control knob is
properly installed to allow full
clockwise position. If problem
persists, replace pressure
transducer.
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.
Pressure setting is too low
Increase pressure.
Large pressure drop in hose with
heavy materials
Use larger diameter hose and/or
reduce overall length of hose.
Check to see if Amp switch (15/20) is
on low setting. Make sure circuit is
able to provide high setting.
Switch to 20A setting. Change to
circuit that provides 20A. Change
to less loaded circuit.
Motor runs but pump does
not stroke
Displacement pump pin damaged or
missing.
Replace pump pin if missing. Be
sure retainer spring is fully in
groove all around connecting rod.
Connecting rod assembly damaged. Replace connecting rod assembly.
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.
Tip is partially clogged
Clear tip.
Fluid supply is low or empty
Refill fluid supply. Prime pump.
Check fluid supply often to prevent
running pump dry.
PROBLEM
CAUSE
SOLUTION
