5. Overheating
Symptoms Remedy/Solution
Relief valve setting too low - Adjust setting using a pressure
allowing oil by-pass directly gauge - See Setting Section
to tank
Radiator blocked with road dirt - Clean/remove obstruction
or obstructed reducing cooling
Radiator fan not working - Replace fan motor/ investigate
for fan interference
Hydraulic motor/pump is worn - Repair or replace unit
and has excessive internal
leakage
Flow too high for Hydrapak - Reduce P.T.O. speed
(maximum 140 litres/min.)
Incorrect motor / pump type - Replace with higher eciency
used equipment
4. Erratic Operation of Motor
Symptoms Remedy/Solution
Entrapped air causing - Ensure that oil in system is
uctuating pump delivery clear from bubbles and foam
(See 1a)
Inconsistant P.T.O. speed - Check PTO spec,condition,
engine speed & engine
management system
Air pocket in system - Remove air from system by
bleeding
3. Pump Deliveries Low or No Fluid
Symptoms Remedy/Solution
Low oil level - Examine for cause of loss of
oil and top up
Suction line restricted or closed - See 1a
Pump running in reverse - Check rotation of pump and
P.T.O.
Incorrect oil having too high a - Change oil
viscosity
P.T.O. running too slow - Check speed
Maintenance
When handling hot Relief
Valves wear heat resistant
gloves.
CAUTION
Only a small amount of water
will cause this eect and will
not result in short term system
damage.
NOTE
6. Oil Condition
Symptoms Remedy/Solution
Oil looks milky (caused by water - Check for leaks, particulary
entering the system) in cooler
Page 18
4991015005 Date:02/18
Hydrapak Installation, Operating & Maintenance Manual
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