ALKOTA 4142 - Pump Troubleshooting

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Supersedes 08-27-04 Z08-00195 05-26-06 Z08- 00195
REMEDYPOSSIBLE CAUSE
TROUBLE
1. Oil leaking in the
area of water pump
crankshaft
2. Excessive play on
crankshaft
3. Oil leaking at the
rear portion of the
crankshaft.
4. Water in crankcase
5. Worn bearing
6. Dirty or worn check
valves.
7. Presence of metal
particles during oil
change.
8. Water leakage from
under head.
9. Loud knocking noise
in pump
10.Frequent or
premature failure
of the packing
A. Worn crankshaft seal
B. Bad bearing
C. Grooved shaft
D. Failure of retainer o-ring
A. Defective bearings
B. Excess shims
A. Damaged or improperly installed
oil gauge window gasket.
B. Damaged or improperly installed
rear cover.
C. Oil gauge loosed
D. Rear cover screws loose
A. May be caused by humid air
condensing into water inside the
crankcase.
B. Worn or damaged plunger screw
o-ring.
A. Excessive belt tension.
B. Oil contamination.
A. Normal wear.
B. Debris
A. Failure of internal component.
B. New pump
A. Worn packing
B. Cracked/scored plunger
C. Failure of plunger retainer o-ring
A. Pulley loose on crankshaft
B. Defective bearing
C. Worn connecting rod
D. Worn crankshaft
E. Worn crosshead
A. Scored, damaged, or worn
plunger
B. Overpressure to inlet manifold
C. Abrasive material in the fluid
being pumped
D. Excessive pressure and or
temperature of fluid being
pumped.
E. Over pressure of pumps
F. Running pump dry
A. Remove and replace
B. Remove and replace
C. Remove and replace
D. Remove and replace
A. See “Worn bearing”
B. Set up crankshaft.
A. Replace gasket or o-ring
B. Replace gasket or o-ring
C. Tighten oil gauge
D. Tighten rear cover screws
A. Maintain or step up lubrication schedule
B. Remove and replace. See PLUNGER
SERVICE in PUMP MAINTENANCE
A. See BELT TENSION in MACHINE
MAINTENANCE
B. Check oil type and change intervals per PUMP
SPECIFICATIONS
A. Remove and replace
B. Check for lack of water inlet screens
A. Remove and disassemble to find probable
cause.
B. New pumps have machine fillings and debris
and should be drained and refilled per PUMP
SPECIFICATIONS
A. Install new packing.
B. Remove and replace plunger
C. Remove and replace plunger retainer o-ring
A. Check key and tighten set screw
B. Remove and replace bearing
C. Remove and replace connecting rod
D. Remove and replace crankshaft
E. Remove and replace crosshead
A. Remove and replace plungers
B. Reduce inlet pressure
C. Install proper filtration on pump inlet pumping
D. Check pressures and fluid inlet temperature;
be sure they are within specified range
E. Reduce pressure
F. Do not run pump without water.
PUMP TROUBLESHOOTING