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3094096
Troubleshooting
Relieve pressure; page 5.
PROBLEM CAUSE SOLUTION
E=XX is displayed Fault condition exists Determine fault correction from table, page 14.
Engine won’t start Engine switch is OFF Turn engine switch ON
Engine is out of gas Refill gas tank. Honda Engines Owner’s Manual.
Engine oil level is low Try to start engine. Replenish oil, if necessary.
Honda Engines Owner’s Manual.
Spark plug cable is disconnected or damaged Connect spark plug cable or replace spark
plug
Cold engine Use choke
Fuel shutoff lever is OFF Move lever to ON position
Oil is seeping into combustion chamber Remove spark plug. Pull starter 3 to 4 times.
Clean or replace spark plug. Start engine.
Keep sprayer upright to avoid oil seepage.
False tripping of WatchDog
system. EMPTY is displayed.
Pump does not run.
Operating conditions out of WatchDog param-
eters
Low pump output; page 7.
Turn pressure down. Contact Graco Technical
Assistance to adjust WatchDog parameters.
Operate without WatchDog active; Manual
309408.
Engine operates, but dis-
placement pump does not
operate
Error code displayed? Reference pressure control repair. Page 15.
Pump switch is OFF Turn pump switch ON.
Pressure setting is too low Turn pressure adjusting knob clockwise to
increase pressure.
Fluid filter (318) is dirty Clean filter. Page 24.
Tip or tip filter is clogged Clean tip or tip filter. Manual 309091.
Displacement pump piston rod is stuck due to
dried paint
Repair pump. Manual 309277.
Connecting rod is worn or damaged Replace connecting rod. Page 8.
Drive housing is worn or damaged Replace drive housing. Page 9.
Electrical power is not energizing clutch field Check wiring connections. Page 13.
Reference pressure control repair. Page 15.
Reference wiring diagram. Page 25.
With pump switch ON and pressure turned to
MAXIMUM, use a test light to check for power
between clutch test points on control board.
Remove 7–pin connector from control board
and measure resistance across clutch coil. At
70_ F, the resistance must be between 1.2
±0.2Ω (GMax 3900); 1.7 ±0.2Ω (GMax 5900);
if not, replace pinion housing.
Have pressure control checked by authorized
Graco dealer.
Clutch is worn, damaged, or incorrectly
positioned
Replace clutch. Page 10.
Pinion assembly is worn or damaged Repair or replace pinion assembly. Page 10.