Control Board Diagnostics; Pump Diagnostics; Pump Service - Magnum 261800 Repair And Parts Manual

Control Board Diagnostics

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 14.
2. Unplug electrical cord.
3. Remove cover screws and front cover.
4. Project Painter 5 and Project Painter 7, go to step 6.
SR7, Prox7 and Prox9: Remove yoke and guide
rods.
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.
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.
312004B
Control Board Diagnostics

Pump Diagnostics

Pump Service

7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
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 28.
• If motor does not run, replace control board
repeat test. Control Board Kit, page 28.
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 30.
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, beginning on
page 28.
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