ACDelco PN 09301 A manual Diagnosis and Maintenance, Problem Probable Cause Solution

DIAGNOSIS AND MAINTENANCE

PROBLEM	PROBABLE CAUSE	SOLUTION
Low Pressure	Worn nozzle	Replace nozzle of proper size.
	Belt slippage.	Tighten or replace; use correct belt.
	Air leak in inlet plumbing.	Use PTFE liquid or tape.
	Pressure gauge inoperative or not	Check pressure with new gauge and replace as needed.
	registering accurately.
	Relief valve stuck partially plugged or	Clean and reset relief valve to system pressure and correct by-
	improperly adjusted.	pass. Check supply tank for contamination.
	Worn seat or valves.	Clean or replace with valve kit.
	Inlet suction strainer clogged or improperly	Use adequate size for inlet pump connection and fluid being
	sized.	pumped. Clean frequently.
	Worn seals. Abrasives in pumped fluid,	Install and maintain proper filter, check line size and flow available
	severe cavitation; inadequate water	to pump. Install a C.A.T.
	supply, stressful inlet conditions.
	Fouled or dirty inlet or discharge valves.	Clean inlet and discharge valve assemblies.
	Worn inlet or discharge valves.	Replace with valve kit.
	Leaky discharge hose.	Replace hose. Check connections.
Pulsation, pump runs	Faulty Pulsation Dampener	Check precharge (should be 30-50%) of system pressure or
extremely rough, pressure
		replace as needed.
low.
	Restricted inlet or air entering inlet	Check filters and clean as needed. Check fittings and use PTFE
	plumbing.	liquid or tape for air tight connection.
	Stuck inlet or discharge valve	Clean or replace valve. Check supply tank for contamination.
Water leakage from under	Worn seals	Replace with seal kit, check inlet pressure and system
the manifold		temperature, use Thermo Valve in by- inlet pressure regulator in
		inlet line.
Oil leak between crankcase	Worn crankcase seals	Replace crankcase seals
and pumping section *Slight
leakage.
Oil leaking in area of	Worn crankshaft seal Bad bearing	Replace damaged seals. Replace bearing.
crankshaft
Excessive play in the end of	Worn bearing	Replace bearing.
the crankshaft.
Water in crankcase inside of	Humid air condensing into water	Change oil every 3 months or 500 hours intervals using premium
the crankcase		grade 10W30 Non-detergent hydraulic oil, (other approved oil
		every month or 200 hours.)
	Leaking of crankcase seals or seals	Replace seals. Follow proper installation procedure. Contact Cat
	installed backward	Pumps supplier for crankcase servicing.
Oil leaking at the rear	Damaged or improperly installed oil gauge,	Replace oil gauge, crankcase cover or drain plug o-ring. Thread in
portion of the crankcase	crankcase cover, or drain plug o-ring	oil gauge and drain plug hand tight to avoid extruding o-ring.
Loud knocking noise in	Pulley loose on crankshaft	Check key and tighten screw
pump
	Worn bearing, connecting rod or	Consult Cat Pumps supplier for crankcase servicing.
	crankshaft.
	Stressful inlet conditions.	Install C.A.T.
Frequent or premature	Cracked or scored plungers Abrasive	Replace plungers Install proper filtration on pump inlet plumbing.
failure of the packing	material in the fluid being pumped Check
	supply tank for contamination.
	Excessive pressure and/or temperature of	Check pressure and fluid inlet temperature; be sure they are within
	fluid being pumped.	specified range.
	Over pressure of inlet or discharge	Reduce pressure per specifications.
	Running pump dry.	DO NOT RUN PUMP WITHOUT WATER!
Strong surging at the inlet	Foreign particles in the inlet or discharge	Check for smooth surfaces on inlet and discharge valve seats.
and low pressure at the	valve or worn inlet or discharge valves.	Replace with kit if pitted or worn. Check supply tank for
discharge side.		contamination, Install and regularly clean filter. Do not pump
		abrasive fluids.

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