Troubleshooting
28
334730F
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.
Large pressure drop in hose
with heavy materials.
Reduce overall length of hose.
Check extension cord for
correct size.
See
Loose motor brushes and
terminals.
Tighten terminal screws.
Replace brushes if leads are
damaged.
Worn motor brushes. (Brushes
must be 1/2 in. [13mm]
minimum length.)
Replace brushes.
Broken and misaligned motor
brush springs. Rolled portion of
spring must rest squarely on
top of brush.
Replace spring if broken.
Realign spring with brush.
Motor brushes are binding in
brush holders.
Clean brush holders, remove
carbon dust with a small
cleaning brush. Align brush
lead with slot in brush holder to
assure free vertical brush
movement.
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.
Problem
What to Check
If check is OK, go to next
check
What to Do
When check is not OK,
refer to this column