PUMP SYSTEM MALFUNCTION

MALFUNCTION

The Pressure and/ or the Delivery Drops

CAUSE

Worn packing seals Broken valve spring Belt slippage

Worn or Damaged nozzle Fouled discharge valve Fouled inlet strainer Worn or Damaged hose

Worn or Plugged relief valve on pump Cavitation

Unloader

REMEDY

Replace packing seals Replace spring Tighten or Replace belt Replace nozzle Clean valve assembly Clean strainer Repair/Replace hose

Clean, Reset, and Replace worn parts Check suction lines on inlet of pump for restrictions

Check for proper operation

Water in crankcase

High humidity

Reduce oil change interval

 

Worn seals

Replace seals

 

 

 

Noisy Operation

Worn bearings

 

Cavitation

Replace bearings, Refill crankcase oil with recommended lubricant Check inlet lines for restrictions and/or proper sizing

Rough/Pulsating

Worn packing

Operation with

Inlet restriction

Pressure Drop

 

 

Accumulator pressure

 

Unloader

 

Cavitation

Replace packing

Check system for stoppage, air leaks, correctly sized inlet plumbing to pump Recharge/Replace accumulator Check for proper operation Check inlet lines for restrictions and/or proper size

Pressure Drop at

Restricted discharge plumbing

Re-size discharge plumbing to

Gun

 

flow rate of pump

Excessive Leakage

Worn plungers

 

Worn packing/seals

 

Excessive vacuum

 

Cracked plungers

 

Inlet pressure too high

Replace plungers

Adjust or Replace packing seals Reduce suction vacuum Replace plungers

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

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Giant P208, P205, P206 installation instructions Pump System Malfunction

P206, P208, P205 specifications

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