HARBEN 4018 DPK, Operation & Maintenance Manual

Page: 34 / 49

32
6.3. Pump Fault Finding
Problem Possible Cause
Recommended
Action

Mixing of oil and
water in
crankcase

Loss of pressure

Pump not running
evenly

Worn or damaged
delivery valves.

Damaged filter element
allowing debris to jam
delivery valve

Check all delivery
valves – replace as
necessary

Check all diaphragms
– replace as
necessary

Replace oil

Check filters – replace
as necessary

1 Loss of
crankcase oil
through high-
pressure hose

Loss of pump
pressure

Pump not running
evenly

Inlet restriction may
have been caused
through:
o
Blocked filters
o
Kinked inlet
hose
o
Worn or
damaged inlet
valves
o
Excessive inlet
hose length

Pump has been frozen

Clear restriction

Check inlet valves –
replace as necessary

Check diaphragms –
replace as necessary

Replenish oil

Mixing of oil and
water in
crankcase

Diaphragm failure (may
have been through
fatigue from excessive
running hours)

Check all diaphragms
– replace as
necessary