Control Board Diagnostics; Pump Diagnostics; Pump Service - Magnum 232735 Repair And Parts Manual

Check for motor problems before replacing control board. A damaged motor may burn out a good
control card
Check for a damaged control board or pressure control switch as follows:
1. Relieve pressure, page 10.
2. Unplug electrical cord.
3. Remove four cover screws and front cover (XR9).
Remove motor enclosure (dx).
4. Remove yoke and guide rods (XR models only).
5. Remove gear (XR models only).
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.
CAUTION
When repairing or cleaning the pump, never
submerge pump in water or allow fluid to enter
pressure control.
CAUTION
When repairing or cleaning pump, never
submerge pump in water or allow fluid to enter
pressure control.
309226M

Control Board Diagnostics

Pump Diagnostics

Pump Service

Pressure control switch does not have to be
installed in pump.
8. Turn pressure control adjustment knob (C) +to max-
imum pressure setting.
9. Plug electrical cord into 120VAC receptacle.
10. Turn power switch (B) ON.
• If motor runs, replace pressure switch.
Pressure Control Switch Kit, page 22.
• If motor does not run, replace control board
repeat test. Control Board Kit, page 22.
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 22.
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. List of Kits, page 22.
Control Board Diagnostics
25