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Motor Diagnostics
Motor Diagnostics
Check for electrical continuity in motor armature,
windings and brush as follows:
Rotate motor and inspect bearings and shaft for proper
fit. There should be no clearance. Inspect gear train for
wear or binding. Check armature and field winding for
discoloration (dark brown) and burnt odor. Replace
motor if burning has occurred. Inspect commutator and
brushes for wear and arcing. If commutator surface is
pitted and uneven in color, replace motor.
If Motor Diagnostics reveal a damaged motor or if motor
brushes are shorter than 1/4 in. (6.4 mm) or if the motor
shaft cannot turn, replace the motor using Motor Kit,
page 17.
Setup
1. Relieve pressure, page 10.
2. Unplug electric cord.
3. Remove enclosure and disconnect motor leads from
control card.
4. Remove four screws and front cover.
Control Board Diagnostics
NOTE: Check for motor problems before replacing con-
trol board. A damaged motor may burn out a good con-
trol card.
Check for a damaged control board or pressure control
switch as follows:
1. Relieve pressure, page 10.
2. Unplug electrical cord.
3. Remove cover screws and front cover.
4. Remove yoke and guide rods.
18
5. Remove gear.
6. Remove pressure control harness from control
board. Using tip of small, flat blade screwdriver,
press tab on right side connector to release.
7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
NOTE: Pressure control switch does not have to be
installed in pump.
8. Turn pressure control adjustment knob clockwise to
maximum pressure setting.
9. Plug electrical cord into 120VAC receptacle.
10. Turn power switch ON.
•
If motor runs, replace pressure switch.
Pressure Control Switch Kit, page 17.
•
If motor does not run, replace control board
repeat test. Control Board Kit, page 17.
Pump Diagnostics
NOTICE
When repairing or cleaning the pump, never submerge
pump in water or allow fluid to enter pressure control.
When pump packings wear, paint begins to leak down
outside of pump. Replace pump packings at the first
sign of leaking or additional damage to drive train could
occur. Use Pump Repair Kit, page 17.
Pump Service
NOTICE
When repairing or cleaning pump, never submerge
pump in water or allow fluid to enter pressure control.
If sprayer continues to cycle (motor and pump run) when
the spray gun trigger is released, or if performance is
poor even with new spray tips and clean filters, the
pump inlet or outlet valve may be obstructed or worn. If
a pump is worn, replace it using Pump Repair Kit (see
List of Kits, page 17).
3A2361B
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