Hitachi 231580 - Manual (Page 14)

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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. Check motor armature commutator for burn
spots, gouges and extreme roughness. Re-
move motor cover and brush inspection plates
to check. See page 19.
5. Remove motor and have motor shop
resurface commutator if possible. See
page 22.
6. Check motor armature for shorts using arma-
ture tester (growler) or perform motor test.
See page 17.
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.
7. Replace loose terminals; crimp to leads.
Be sure male terminal blades are straight
and firmly connected to mating part.
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.
8. Replace board. See page 23.
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.
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.
10. Replace ON/OFF switch. See page 23.
11. Check motor thermal cutout switch. Connect
ohmmeter 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 26.
13. Check pressure transducer (29) for hardened
paint or damaged or worn components. See
page 27.
13. Replace transducer. See page 27. 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. Check 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 21.