Giant P217, Operating Instructions/ Repair And Service Manual

14

PUMP SYSTEM MALFUNCTION

MALFUNCTION

The Pressure and/or
the Delivery Drops

Water in crankcase

Noisy Operation

Rough/Pulsating
Operation with
Pressure Drop

Pressure Drop at
Gun

Excessive Leakage

High Crankcase
Temperature

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

High humidity
Worn seals

Worn bearings

Cavitation

Worn packing
Inlet restriction

Accumulator pressure
Unloader
Cavitation

Restricted discharge plumbing

Worn plungers
Worn packing/seals
Excessive vacuum
Cracked plungers
Inlet pressure too high

Wrong Grade of oil
Improper amount of oil in crankcase

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

Reduce oil change interval
Replace seals

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

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

Re-size discharge plumbing to
flow rate of pump

Replace plungers
Adjust or Replace packing seals
Reduce suction vacuum
Replace plungers
Reduce inlet pressure

Giant oil is recommended
Adjust oil level to proper amount