Hitachi 231580 manual No output motor runs but pump does not stroke

Intermediate Problem Solving

TYPE OF PROBLEM

Low output (continued)

WHAT TO CHECK	WHAT TO DO
If check is OK, go to next check	When check is not OK, refer to this column
3. Release gun trigger. Observe resting position of	3. If pump consistently comes to rest with
pump rod (107).	rod (107) fully extended, the piston pack-
	ings and/or piston valve may be worn.
	Service the pump. See page 21.

4.Check electrical supply with volt meter. Meter should read 105±125VAC.

5.Check extension cord size and length; must be at least 12 gauge wire and less than 150 ft (45 m) long.

6.Check motor brushes. See Electrical ± What To Check, item 4, on page 13.

7.Check motor start board (47) by substituting with a good board.

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.Check motor armature for shorts by using an armature tester (growler) or perform motor test. See page 17.

4.Reset building circuit breaker; replace building fuse. Repair electrical outlet or try another outlet.

5.Replace with a correct, grounded exten- sion cord.

6.See page 19.

7.Replace board. See page 23.

8.Replace motor. See page 22.

Drain valve leaks

Transducer leaks

No output: motor runs and pump strokes

1.Check drain valve for correct torque and/or worn parts. Check for debris trapped on seat.

1. Slight leakage from transducer is normal.

1.Check paint supply.

2.Check for clogged intake strainer.

3.Check for loose suction tube or fittings. See page 30.

4.Check to see if intake valve ball and piston ball are seating properly. See page 21.

9.Tighten to 185 in±lb (21 N.m). Clean valve and replace with new gasket (42a) and sealant (42d). See page 28.

1.Periodically remove residue from its cyl- inder port. See page 27.

1.Refill and reprime pump.

2.Remove and clean, then reinstall.

3.Tighten; use thread sealant on npt threads of adapter (38).

4.Remove intake valve and clean. Check ball and seat for nicks; replace as need- ed. See page 21. Strain paint before us- ing to remove particles that could clog pump.

5.Check for leaking around throat packing nut which may indicate worn or damaged packings. See page 21.

6.Release gun trigger. Observe resting position of pump rod (107).

5.Replace packings. See page 21. Also check piston valve seat for hardened paint or nicks and replace if necessary. Tighten packing nut/wet-cup.

6.If pump consistently comes to rest with rod (107) fully extended, the piston pack- ings and/or piston valve may be worn. Service the pump. See page 21.

No output: motor runs but pump does not stroke

1.Check displacement pump connecting rod pin (17). See Fig. 18, page 21.

7.Check connecting rod assembly (15) for dam- age. See page 24.

8.Be sure crank in drive housing rotates; plug in sprayer and turn on briefly to check. Turn off and unplug sprayer. See page 24.

1.Replace pin if missing. Be sure retainer spring (18) is fully in groove all around connecting rod.

7.Replace connecting rod assembly. See page 24.

8.Check drive housing assembly for damage and replace if necessary. See page 24.

3￿87￿5 ￿5