2. Insucient Pressure in the System
Symptoms Remedy/Solution
Pump will not prime - See 1a and 1b
Relief valve opening below - Adjust the setting using a
setting. pressure gauge, change Relief
valve if necessary
Hydraulic motor/pump is worn or - Repair or replace unit
has excessive external damage
Lack of power from engine - Examine for possible faults in
system specication and
engine management system
Pump has not been primed - See pump installation
instructions
4.4 Fault Finding
1. Noisy system
Symptoms Remedy/Solution
a. Cavitation of pump due to :-
Low oil supply - Top up oil
Incorrect grade of oil - Replace with correct grade
oil.
Suction line restriction - Remove restriction
Sharp bend in suction line - Modify design / line length
b. Air entering system due to :-
Leakage in suction line - Inspect and tighten pipe
connections
Low oil level - Replenish / Top up
Leaking packings, pump shaft - Check and replace as
necessary seals etc.
c. Mechanical errors due to :-
Worn or damaged pump - Repair or replace pump
Worn or damaged motor - Repair or replace unit(s)
Failure of P.T.O. - Repair or replace as necessary
d. Vibrating pipes due to :-
Cavitation of pump - (see Cavitation of pump)
Resonance of system - Introduce exible piping at
critical points and/or fasten
pipes
Unstable relief valve - Check setting/examine.
Replace as necessary
Maintenance
When performing any type of
maintenance or fault nding,
ensure all rotating parts etc.
are guarded or isolated for
inspection.
CAUTION
Unless all the components
of a functioning hydraulic
system are kept in a good
working condition, operational
problems are likely to occur.
NOTE
Page 17
4991015005 Date:02/18
Hydrapak Installation, Operating & Maintenance Manual
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