Delco PN 09301 A - Manual (Page 12)

Manual Page 12
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
registering accurately. Check pressure with new gauge and replace as needed.
Relief valve stuck partially plugged or
improperly adjusted. Clean and reset relief valve to system pressure and correct by-
pass. Check supply tank for contamination.
Worn seat or valves. Clean or replace with valve kit.
Inlet suction strainer clogged or improperly
sized. Use adequate size for inlet pump connection and fluid being
pumped. Clean frequently.
Worn seals. Abrasives in pumped fluid,
severe cavitation; inadequate water
supply, stressful inlet conditions. Install and maintain proper filter, check line size and flow available
to pump. Install a C.A.T.
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
extremely rough, pressure
low.
Faulty Pulsation Dampener
Check precharge (should be 30-50%) of system pressure or
replace as needed.
Restricted inlet or air entering inlet
plumbing. Check filters and clean as needed. Check fittings and use PTFE
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
the manifold
Worn seals Replace with seal kit, check inlet pressure and system
temperature, use Thermo Valve in by- inlet pressure regulator in
inlet line.
Oil leak between crankcase
and pumping section *Slight
leakage.
Worn crankcase seals Replace crankcase seals
Oil leaking in area of
crankshaft
Worn crankshaft seal Bad bearing Replace damaged seals. Replace bearing.
Excessive play in the end of
t
he crankshaft.
Worn bearing Replace bearing.
Water in crankcase inside of
the crankcase
Humid air condensing into water Change oil every 3 months or 500 hours intervals using premium
grade 10W30 Non-detergent hydraulic oil, (other approved oil
every month or 200 hours.)
Leaking of crankcase seals or seals
installed backward Replace seals. Follow proper installation procedure. Contact Cat
Pumps supplier for crankcase servicing.
Oil leaking at the rear
portion of the crankcase
Damaged or improperly installed oil gauge,
crankcase cover, or drain plug o-ring Replace oil gauge, crankcase cover or drain plug o-ring. Thread in
oil gauge and drain plug hand tight to avoid extruding o-ring.
Loud knocking noise in
pump
Pulley loose on crankshaft Check key and tighten screw
Worn bearing, connecting rod or
crankshaft.
Consult Cat Pumps supplier for crankcase servicing.
Stressful inlet conditions. Install C.A.T.
Frequent or premature
failure of the packing
Cracked or scored plungers Abrasive
material in the fluid being pumped Check
supply tank for contamination. Replace plungers Install proper filtration on pump inlet plumbing.
Excessive pressure and/or temperature of
fluid being pumped. Check pressure and fluid inlet temperature; be sure they are within
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
and low pressure at the
discharge side.
Foreign particles in the inlet or discharge
valve or worn inlet or discharge valves. Check for smooth surfaces on inlet and discharge valve seats.
Replace with kit if pitted or worn. Check supply tank for
contamination, Install and regularly clean filter. Do not pump
abrasive fluids.