Giant SP100W Pump System Malfunction, Worn packing seals Broken valve spring Belt slippage

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