Advanced Troubleshooting
332697C
25
Low or Fluctuating Output
Specific Problem
Cause
Solution
Pump cycles, but output is low or
surging.
See
Basic Troubleshooting
,
page 15.
Worn or obstructed inlet and
outlet valves.
Check for worn pump valves as follows:
Prime sprayer with paint. Turn the Prime/Spray valve
to SPRAY position. Turn pressure control fully
clockwise.
Trigger spray gun briefly.
When spray gun trigger is released pump should
cycle momentarily and stop.
If pump continues to cycle, pump valves may be
worn or obstructed.
For replacement inlet and outlet valve kits, see
List
of Kits
, page 30.
Prime/Spray valve is leaking out
drain line when Prime/Spray
valve is in SPRAY position.
Check Prime/Spray valve for debris trapped on seat
and for worn parts. Torque to 130 - 180 in-lb
(15.8 - 18.1 N•m). Replace if parts are worn using
Prime/Spray Valve Kit
. See
List of Kits
, page 30.
Voltage from electrical outlet is
too low. Low voltages reduce
sprayer performance.
Check voltage of outlet. Meter must read 220-240
VAC.
Extension cord is too long or not
heavy enough gauge.
Replace extension cord.
See
Grounding and Electrical Requirements
,
Leads from motor or pressure
switch to control board are
damaged, loose, pinched, or
overheated.
Be sure terminals are centered and firmly
connected. Inspect for pinched wiring and wiring
insulation and terminals for signs of overheating.
Replace any loose terminals or damaged wiring.
Securely reconnect terminals.
Motor brushes are worn.
Check length of BOTH brushes (brushes do not
wear evenly on both sides of the motor). Brush
length must be 0.25 in. (6.4mm). If brushes are
worn, replace motor using
Motor Kit
. See
List of
Kits,
page 30.
Motor brush springs are broken. If springs are broken, replace motor using
Motor Kit
.
See
List of Kits
, page 30.
Motor brushes are binding in
brush holders.
Clean brush holders. Remove carbon dust with
small cleaning brush.
Motor stops before sprayer
reaches correct pressure (stall
pressure is too low).
Replace pressure control using
Pressure Control
Switch Kit
, page 28.
Control board is damaged.
CAUTION:
Do not perform
control board diagnostics until
you have determined the
armature is good. A damaged
armature can burn out a good
control board.
See
Control Board Diagnostics
, page 29. If
damaged, replace control board using
Control
Board Kit
. See
List of Kits
, page 30.
