5
308854
Troubleshooting
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Motor runs and pump strokes,
but output is low or there is no
output.
Extension cord size and length.
Replace cord with a larger size, grounding
type extension cord.
Paint supply.
Refill and reprime pump.
Clogged intake strainer.
Remove and clean strainer and reinstall. Mark
V models 232171 and 232173 strainer is for
use in paint only.
Loose suction tube or loose fittings.
Tighten; use thread sealant or sealing tape on
threads, if necessary.
Worn spray tip.
Follow
Pressure Relief Procedure
Warning
, then replace tip. See your
separate gun or tip manual.
Motor brushes, loose leads and terminals,
minimum 13 mm brush length, broken or
misaligned springs, or brushes binding in
holders. See page 7.
Replace parts as needed. See page 7.
Motor armature for shorts. Use an armature
tester (growler).
Replace motor. See page 13.
If pump continues to stroke when gun trigger
is released. With pump on and primed, trigger
gun momentarily, then release and engage
safety latch. Relieve pressure, turn off and
unplug sprayer.
Service pump. See manual 308798.
If intake valve ball and piston ball are seating
properly.
Remove intake valve and clean. Check balls
and seats for nicks; replace if necessary.
See manual 308798. Strain paint before
using to remove particles that could clog the
pump.
Intake valve ball is packed with material.
Remove and clean intake valve. Do not
leave Mark V models 232171 and 232173
sprayers under pressure for more than 5
minutes when pumping texture material and
not actively spraying.
Leaking around throat packing nut which may
indicated worn or damaged packings.
Replace packings. See manual 308798.
Also check piston valve seat for hardened
paint or nicks and replace if necessary.
Tighten the packing nut/wetcup.
Defective pressure control transducer.
Replace pressure control transducer. See
page 10.
(Continued on page 6)
