6
824113
Basic Problem Solving
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column
Electrical
(continued)
5. Motor armature commutator for burn spots,
gouges and extreme roughness. Remove mo-
tor cover and brush inspection plates to check.
See page 10.
5. Remove motor and have motor shop
resurface commutator if possible. See
page 13.
6. Motor armature for shorts using armature tester
(growler) or perform motor test.
See page 9.
6. Replace motor. See page 13.
7. Leads from pressure control and motor to mo-
tor start board (47) to be sure they are securely
fastened and properly mated.
7. Replace loose terminals; crimp to leads.
Be sure male terminal blades are straight
and firmly connected to mating part.
8. Motor start board (47) by substituting with a
good board. See page 14.
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.
8. Replace board. See page 14.
9. Power supply cord (50). Disconnect black and
white power cord terminals; connect volt meter
to these leads. Plug in sprayer. Meter must
read: 105–125 VAC for models 820169 and
824175. Unplug sprayer.
9. Replace power supply cord. See page
14.
10. 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 must read: 105–125 VAC for
models 820169 and 824175.
10. Replace ON/OFF switch. See page 14.
11. Motor thermal cutout switch. Connect ohmme-
ter between motor’s red leads. Meter should
read 1 ohm maximum.
11. Allow motor to cool. Correct cause of
overheating. If switch remains open after
motor cools, replace motor.
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.
12. Replace pressure control. See page 16.
13. Pressure transducer (29) for hardened paint or
damaged or worn components. See page 17.
13. Replace transducer. See page 17. Thor-
ough system flushing will help extend life
of transducer.
Intermediate Problem Solving
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Low output
1. For worn spray tip.
1. Follow Pressure Relief Procedure then
replace tip. See your separate gun or tip
manual.
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.
2. Service pump. See page 12.
