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	Check for proper operation
	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
Pressure Drop at Gun	Restricted discharge plumbing	Re-size discharge plumbing to
		flow rate of pump
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-List & Recommended Spare Parts List

PUMP SYSTEM MALFUNCTION