Basic Problem Solving
TYPE OF PROBLEM
Electrical (continued)
WHAT TO CHECK
If check is OK, go to next check
5.Check motor armature commutator for burn spots, gouges and extreme roughness. Re- move motor cover and brush inspection plates to check. See page 19.
6.Check motor armature for shorts using arma- ture tester (growler) or perform motor test. See page 17.
WHAT TO DO
When check is not OK, refer to this column
5.Remove motor and have motor shop resurface commutator if possible. See page 22.
6.Replace motor. See page 22.
7.Check leads from pressure control and motor to motor start board (47) to be sure they are se- curely fastened and properly mated.
8.Check motor start board (47) by substituting with a good board. See page 23.
CAUTION: Do not perform this check until mo- tor armature is determined to be good. A bad motor armature can burn out a good board.
9.Check power supply cord (50). Disconnect black and white power cord terminals; connect volt meter to these leads. Plug in sprayer. Meter should read 105±125VAC. Unplug sprayer.
7.Replace loose terminals; crimp to leads. Be sure male terminal blades are straight and firmly connected to mating part.
8.Replace board. See page 23.
9.Replace power supply cord. See page 23.
10.Check ON/OFF switch (52). Disconnect the motor start board (47) and switch and connect volt meter between exposed terminal on switch and power cord's white wire. Plug in sprayer and turn ON. Meter should read 105±125VAC Turn off and unplug sprayer.
11.Check motor thermal cutout switch. Connect ohmmeter between motor's red leads. Meter should read 1 ohm maximum.
12.Remove pressure control (64) and check mi- croswitch operation with ohmmeter:
(1)With pressure knob at lowest setting and stem pushed into control, readings should be: white & black = 1 ohm max.
white & red = open.
(2)With pressure knob at highest setting,read- ings should be: white & black = open; white & red = 1 ohm max.
13.Check pressure transducer (29) for hardened paint or damaged or worn components. See page 27.
10.Replace ON/OFF switch. See page 23.
11.Allow motor to cool. Correct cause of overheating. If switch remains open after motor cools, replace motor.
12.Replace pressure control. See page 26.
13.Replace transducer. See page 27. Thor- ough system flushing will help extend life of transducer.
Intermediate Problem Solving
TYPE OF PROBLEM
Low output
WHAT TO CHECK
If check is OK, go to next check
1.Check for worn spray tip.
2.Be sure pump does not continue to stroke when gun trigger is released. Plug in and turn on sprayer. Prime with paint. Trigger gun mo- mentarily, then release and lock safety latch. Relieve pressure, turn off and unplug sprayer.
WHAT TO DO
When check is not OK refer to this column
1.Follow Pressure Relief Procedure then replace tip. See your separate gun or tip manual.
2.Service pump. See page 21.
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