Giant GP7145 installation instructions Pump System Malfunctions, Cause, Remedy

PUMP SYSTEM MALFUNCTIONS

MALFUNCTION	CAUSE	REMEDY
The Pressure and/	Worn packing seals	Replace packing seals
or the Delivery Drops	Broken valve springs	Replace springs
	Belt slippage	Tighten or Replace belt
	Worn or Damaged nozzle	Replace nozzle
	Fouled discharge valve	Clean valve assembly
	Worn or Plugged relief valve on pump	Clean, Reset, and Replace
		worn parts
	Cavitations	Check suction lines on inlet
		of pump for restrictions
	Unloader	Check for proper operation
Water in Crankcase	High Humidity	Reduce oil change intervals
	Worn Seals	Replace seals
Noisy Operating	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
Pressure Drop	Inlet restriction	Check system for stoppage
		air 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	Re-size discharge plumbing to flow
Drop at gun Rated,		rate of pump
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

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