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 | ||
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Drain valve | 1. | Drain valve for correct torque and/or worn parts. Check for | 1. | Tighten to 185 |
leaks |
| debris trapped on seat. |
| valve and replace with new gasket (55) |
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| and sealant |
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No output: | 1. | Paint supply. | 1. | Refill and reprime pump. |
motor runs |
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and pump |
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strokes |
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| 2. | For clogged intake strainer. | 2. | Remove and clean, then reinstall. |
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| 3. | For loose suction tube or fittings. | 3. | Tighten; use thread sealant on |
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| npt threads of adapter fitting (43). |
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| 4. | To see if intake valve ball and piston ball are seating | 4. | Remove intake valve and clean. Check |
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| properly. See page 11. |
| ball and seat for nicks; replace as need- |
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| ed. See page 11. Strain paint before us- |
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| ing to remove particles that could clog |
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| pump. |
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5.For leaking around throat packing nut which may indicate worn or damaged packings. See page 11.
5.Replace packings. See page 11. Also check piston valve seat for hardened paint or nicks and replace if necessary. Tighten packing nut.
6.Release gun trigger. Observe resting position of pump rod (222).
6.If pump consistently comes to rest with rod (222) fully extended, piston packings and/or piston valve may be worn. Service pump. See page 11.
No output: | 1. | Displacement pump connecting rod pin (14). | 1. | Replace pin if missing. Be sure retainer |
motor runs but |
| See Fig. 9, page 11. |
| spring (15) is fully in groove all around |
pump does not |
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| connecting rod. |
stroke |
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| 2. | Connecting rod assembly (12) for damage. See page 15. | 2. | Replace connecting rod assembly. See |
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| page 15. |
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| 3. | Be sure crank in drive housing rotates; plug in sprayer and | 3. | Check drive housing assembly for dam- |
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| turn on briefly to check. Turn off and unplug sprayer. |
| age and replace if necessary. See |
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| See page 15. |
| page 15. |
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Spray pattern | 1. | Spray tip worn beyond sprayer pressure capability. | 1. | Replace spray tip. |
variations |
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| NOTE: Smaller size tip provides |
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| longer life. |
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2.Motor control board (22a) by performing motor control board diagnostics on page 13. If diagnostics indicate, sub- stitute 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 13.
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