14
309044
Advanced Troubleshooting
General Problem: Output is Low or Fluctuating (continued)
SPECIFIC PROBLEM
CAUSE
SOLUTION
Motor runs and pump
cycles, but pressure does
not build up.
Intake valve ball or outlet valve ball is not
seating properly.
Remove and clean valves, and check balls and
seats for nicks; replace if necessary. Strain paint
before spraying to remove particles that could clog
pump.
See
Pump Service
on page 23.
Pump packings are worn or damaged.
Check for leaking around throat packing nut.
Replace pump packings if there are leaks.
See
Pump Service
on page 20.
Spray–Prime/Drain valve is leaking.
Check Spray–Prime/Drain valve for debris trapped
on seat and for worn parts. Torque to 185 in-lb
(21 N
S
m). Replace if parts are worn.
See
Spray–Prime/Drain Valve Kit
on page 28.
Spray pattern has
variations, or pressure
fluctuates excessively.
Leads from motor to control board are
damaged, loose, or overheated.
Be sure terminals are centered and firmly
connected. Inspect wiring insulation and terminals
for signs of overheating, and replace any loose
terminals or damaged wiring. Securely reconnect
terminals.
Pressure control switch leads are pinched
between pump and drive housing or between
front cover and drive housing.
Make sure pressure control harness is routed
behind pump, through retention clip, and
connected to control board connector at back of
drive housing (connected with tab to the right).
Control board is damaged.
CAUTION:
Do not perform control board
diagnostics until you have determined that the
armature is good. A bad motor armature can
burn out a good control board.
See
Control Board Diagnostics
on page 16, and
replace control board if damaged.
See
Control Board Kit
on page 17.
Pressure control switch is damaged.
Replace pressure control switch.
See
Pressure Control Switch Kit
on page 22.
General Problem: There is No Output
SPECIFIC PROBLEM
CAUSE
SOLUTION
Power switch is on and
sprayer is plugged in but
See
Basic Troubleshooting
page 8.
sprayer is plugged in, but
pump does not cycle.
Motor runs, but pump does not
cycle.
Gear and/or yoke are damaged.
Replace gear and yoke.
See
Gear/Yoke Kit
on page 27.
Motor does not run.
Water or paint entered pressure control
switch or shorted control board.
Clean out and/or dry out, and retry. Replace if
necessary. See
Pressure Control Switch Kit
on
page 22.
