Advanced Troubleshooting
313036H
23
General Problem: Low or Fluctuating Output
Specific Problem
Cause
Solution
Pump cycles, but output is low
or surging.
See Basic Troubleshooting,
page 13.
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 28.
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, page 28.
Voltage from electrical outlet is
too low. Low voltages reduce
sprayer performance.
Check voltage of outlet. Meter must read 85 to
130V AC.
Extension cord is too long or
not heavy enough gauge.
Replace extension cord.
See Grounding and Electrical Requirements,
page 10.
Leads from motor or pressure
switch to control board are
damaged, loose, pinched, or
overheated.
Be sure terminals are centered and firmly con-
nected. Inspect for pinched wiring and wiring insu-
lation 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, page 28.
Motor brush springs are bro-
ken.
If springs are broken, replace motor using Motor
Kit, page 28.
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 con-
trol 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 27. If dam-
aged, replace control board using Control Board
Kit, page 28.
Summary of Contents for 24N808
Page 41: ...Notes 313036H 7 Notes ...
