Troubleshooting Guide - OEM 8.6CAH12A Instruction Manual

INSTRUCTION MANUAL
HORIZONTAL AXIAL PUMPS
accessories not obtained from an
authorized dealer or not approved by
the manufacturer.

TROUBLESHOOTING GUIDE

Symptom
Oil leak between
crankcase
and pumping
section
Frequent or
premature failure
of the packing)
Pump runs
but produces
no flow
Pump fails
to prime
Pump looses
prime, chattering
noise, pressure
fluctuates
Low pressure
at nozzle
Pressure gauge
fluctuates
Low pressure
140*213MM
Possible Cause(s)
Worn rod oil seals
Cracked, damaged
or worn plunger
Overpressure to
inlet manifold
Material in the fluid
being pumped
Excessive pressure
and/or temperature of
fluid being pumped
Running pump dry
Pump is not primed
Air is trapped inside pump
Air leak in suction
hose or inlet
Clogged suction strainer
Unloader valve is by-passing Make sure unloader is adjusted property
Incorrect or worn nozzle
Worn packing or valves
Valves worn or blocked
by foreign bodies
Packing worn
Worn nozzle
Low engine RPM
Air leak in inlet plumbing
5 - ENG
Horizontal Axial Pumps
components affected by moving
parts.
HIGH PRESSURE PUMP (DEFECTS IN
MATERIAL AND WORKMANSHIP)
One (1) year from date of purchase.
Corrective Action
Replace crankcase piston rod seals
Replace plungers
Reduce inlet pressure
Install proper filtration on
pump inlet plumbing
Check pressures and fluid inlet
temperature; be sure they are
within specified range
Do not run pump without water
Flood suction then restart pump
Disconnect discharge hose from pump.
Flood suction hose, restart pump and run
pump until all air has been evacuated
Remove suction line and inspect
it for a loose liner or debris lodged
in hose. Avoid all unnecessary
bends. Do not kink hose
Clean strainer
and by-pass seat is not leaking
Make sure nozzle is matched to the
flow and pressure of the pump. If
the nozzle is worn, replace
Replace packing or valves
Clean or replace valves
Replace packing
Replace with nozzle of proper size
Increase engine RPM to 3400
Disassemble, reseal and reassemble