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Troubleshooting
Source of trouble,
Mechanical Drive
effects
Power Take-off
1. Coupling wrongly
either does not turn
aligned. 2. Coupling
at all or too slowly.
loose.
(no delivery flow or
3. Coupling
insufficient delivery
defective.
flow)
4. Loose mounting
on pump and/or
motor.
5. Other
transmission
elements loose.
6. Pump or motor
defective.
7. Direction of
rotation wrong.
Excessive operating
temperature
line shocks when
switching takes
place.
Bosch Rexroth AB, Installation and maintenance manual, Hägglunds DOb, RE 15327-WA/05.2017
Causes Of Trouble And Its Effect In The Hydraulic Installation
Suction line
Suction line
resistance excessive
because:-
1.Suction line
blocked or leaking
2.Fluid level too low
Pump
Pressure line
1. Internal leakage
1. Leakages.
due to wear.
2. Excessive line
2. Pump defective
resistance.
3.Saftey block
3. Pressure filter
pressure set too low
blocked.
or control element
defective
1. Reduction in
1. Pipe bore is
efficiency due to
too small, causing
wear.
high frictional
2. Rotational speed
resistances.
and/or delivery
2. Pressure filter
excessive.
blocked.
1. Line mounts are
missing or loose.
2. Poor installation.
3. Pipe bore too
small.
4. Installation not
bled.
5. Oil volume in lines
is excessive
Return line
1. Excessive line
resistance.
2. Filter blocked.
1. Pipe bore is
too small, causing
High frictional
resistances.
2. Filter blocked.
.
Lines loose.
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