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 |
| 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 |
|
| oil with recommended lubricant |
| Cavitation | Check inlet lines for restrictions |
|
| 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 |
|
| plumbing to pump |
| Accumulator pressure | Recharge/Replace accumulator |
| Unloader | Check for proper operation |
| Cavitation | Check inlet lines for restrictions |
|
| and/or proper size |
|
|
|
Pump Pressure as | Restricted discharge plumbing | |
Drop at gun |
| flow rate of pump |
Rated, Pressure |
|
|
|
|
|
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 |
8