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PUMP SYSTEM MALFUNCTION
MALFUNCTION | CAUSE | REMEDY |
The Pressure and/ | Worn packing seals | Replace packing seals |
or the Delivery | Broken valve spring | Replace spring |
Drops | Belt slippage | Tighten or Replace belt |
| Worn or Damaged nozzle | Replace nozzle |
| Fouled discharge valve | Clean valve assembly |
| Fouled inlet strainer | Clean strainer |
| Worn or Damaged hose | Repair/Replace hose |
| Worn or Plugged relief valve on pump | Clean, Reset, and Replace worn parts |
| Cavitation | Check suction lines on inlet of |
| pump for restrictions |
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| Unloader | Check for proper operation |
Water in crankcase | High humidity | Reduce oil change interval |
| Worn seals | Replace seals |
Noisy Operation | Worn bearings | Replace bearings, Refill crankcase |
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| oil with recommended lubricant |
| Cavitation | Check inlet lines for restrictions |
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| and/or proper sizing |
Rough/Pulsating | Worn packing | Replace packing |
Operation with | Inlet restriction | Check system for stoppage, air |
Pressure Drop |
| leaks, correctly sized inlet |
| Accumulator pressure | plumbing to pump |
| Recharge/Replace accumulator | |
| Unloader | Check for proper operation |
| Cavitation | Check inlet lines for restrictions |
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| and/or proper size |
Pump Pressure as | Restricted discharge plumbing | |
gun |
| flow rate of pump |
Rated, Pressure |
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Excessive | Worn plungers | Replace plungers |
Leakage | Worn packing/seals | Adjust or Replace packing seals |
| Excessive vacuum | Reduce suction vacuum |
| Cracked plungers | Replace plungers |
| Inlet pressure too high | Reduce inlet pressure |
High Crankcase | Wrong Grade of oil | Giant oil is recommended |
Temperature | Improper amount of oil in crankcase | Adjust oil level to proper amount |
Preventative Maintenance
Check | Daily | Weekly | 50hrs | Every | Every | Every |
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| 500 hrs | 1500 hrs | 3000 hrs |
Oil Level/Quality | X |
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Oil Leaks | X |
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Water Leaks | X |
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Belts, Pulley |
| X |
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Plumbing |
| X |
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| Recommended Spare Parts |
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Oil Change (1 Gallon) p/n 1154 |
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| X | X |
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Seal Spare Parts (1 kit/pump) |
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| X |
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Valve Spare Parts (1 kit/pump) |
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| X |
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