TROUBLESHOOTING
PROBLEM | POSSIBLE CAUSE | SOLUTION |
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Noisy pump caused by cavitation | Oil too heavy | Change to proper viscosity. |
| Oil filter plugged | Replace filter. |
| Suction line plugged or too small | Clean line and check for size. |
| Suction line kinked | Replace line. |
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Oil heating | Oil supply low | Fill reservoir. |
| Contaminated oil | Drain reservoir, change filter, and |
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| refill with clean oil. |
| Setting of relief valve too high or | Set to correct pressure. |
| too low |
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| Pump operating too fast | Do not exceed recommended |
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| rpm PTO speed. |
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Shaft seal leakage | Worn shaft seal | Replace shaft seal. |
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Foaming oil | Low oil level | Fill reservoir. |
| Air leaking into suction line | Tighten fittings. |
| Wrong kind of oil | Drain and refill reservoir with non- |
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| foaming oil. |
| Moisture in oil | Keep oil temperature below 180° |
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| and continue to operate as oil |
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| dries out, or replace oil and purge |
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| system if foaming is excessive. |
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Boom drops as dipper or bucket | Load check valve leaking | Clean or replace check valve |
cylinder lever is activated while |
| assembly. |
boom control is in raised position |
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Jerky operation | Hydraulic hoses plumbed | Check hydraulic plumbing |
| incorrectly | schematic and correct hose |
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| routing as required. |
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20 Owner Service | 51861 (Rev. 6/16/2006) |
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