Intermediate Problem Solving

TYPE OF

WHAT TO CHECK

WHAT TO DO

PROBLEM

If check is OK, go to next check

When check is not OK, refer to this column

 

 

 

Low Output

7. Check motor control board (22a) by substituting

7. Replace board. See page 24.

(continued)

with a good board.

 

 

CAUTION: Do not perform this check until motor

 

 

armature is determined to be good. A bad motor

 

 

armature can burn out a good board.

 

 

 

 

8.Check motor armature for shorts by using an arma- ture tester (growler) or perform motor test. See page 20.

8.Replace motor. See page 23

.

Drain Valve Leaks

1.

Check drain valve for correct torque and/or worn

1.

Tighten to 185 in-lb (21 N￿m). Clean

 

 

parts. Check for debris trapped on seat.

 

valve and replace with new gasket (55)

 

 

 

 

and sealant 110–110. See page 30.

 

 

 

 

 

No Output: Motor

1.

Check paint supply.

1.

Refill and reprime pump.

Runs And Pump

 

 

 

 

Strokes

 

 

 

 

 

 

 

 

 

 

2.

Check for clogged intake strainer.

2.

Remove and clean, then reinstall.

 

 

 

 

 

 

3.

Check for loose suction tube or fittings. See

3.

Tighten; use thread sealant on

 

 

page 29.

 

npt threads of suction tube (43). Check

 

 

 

 

for damaged o–ring (45).

 

 

 

 

 

 

4.

Check to see if intake valve ball and piston ball are

4.

Remove intake valve and clean. Check

 

 

seating properly. See page 22.

 

ball and seat for nicks; replace as need-

 

 

 

 

ed. See page 22. Strain paint before us-

 

 

 

 

ing to remove particles that could clog

 

 

 

 

pump.

 

 

 

 

 

 

5.

Check for leaking around throat packing nut

5.

Replace packings. See page 22. Also

 

 

which may indicate worn or damaged packings.

 

check piston valve seat for hardened

 

 

See page 22.

 

paint or nicks and replace if necessary.

 

 

 

 

Tighten packing nut/wet-cup.

 

 

 

 

 

 

6.

Release gun trigger. Observe resting position of

6.

If pump consistently comes to rest

 

 

pump rod (222).

 

with rod (222) fully extended, the piston

 

 

 

 

packings and/or piston valve may be

 

 

 

 

worn. Service the pump. See page 22.

 

 

 

 

 

No Output: Motor

1.

Check displacement pump connecting rod pin (14).

1.

Replace pin if missing. Be sure retainer

Runs But Pump

 

See Fig. 18, page 22.

 

spring (15) is fully in groove all around

Does Not Stroke

 

 

 

connecting rod.

 

 

 

 

 

 

2.

Check connecting rod assembly (12) for damage.

2.

Replace connecting rod assembly. See

 

 

See page 26.

 

page 26.

 

 

 

 

 

 

3.

Be sure crank in drive housing rotates; plug in

3.

Check drive housing assembly for dam-

 

 

sprayer and turn on briefly to check. Turn off and

 

age and replace if necessary. See

 

 

unplug sprayer. See page 26.

 

page 26.

 

 

 

 

 

Spray Pattern

1.

Spray tip worn beyond sprayer pressure capability.

1.

Replace spray tip.

Variations

 

 

 

NOTE: A smaller size tip will provide

 

 

 

 

 

 

 

 

longer life.

 

 

 

 

 

2.Check motor control board (22a) by performing motor control board diagnostics on page 24. If diagnostics indicate, substitute with a good board.

CAUTION: Do not perform this check until motor armature is determined to be good. A bad motor armature can burn out a good board.

2. Replace board. See page 24.

308801 17

Page 17
Image 17
Hitachi 232133 manual Replace pin if missing. Be sure retainer