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72/80
Troubleshooting
Source of trouble,
Mechanical Drive
effects
Excessive noises
1. Coupling wrongly
aligned
2. Coupling loose
3. Coupling
defective
4. Loose mounting
on pump or motor
5. Other
transmission
elements loose.
6. Pump or motor
defective
7. Direction of
rotation wrong
8. Noise dampening
not incorporated
in design (rubber-
metal mountings)
Insufficient power
1.Power
and torque at the
transmission
hydraulic motor
defective
(pressure too low)
2.V-belt or Toothed
belt slipping
3.Motor defective
4.Key sheared at
pump or motor
5. Incorrect
parameter values
regarding electric
motor in the VFD
Jerky motor
1.Coupling wrongly
movements.
aligned
(variations in
2.Coupling loose.
pressure and/or
3.Coupling defective
flow)
4.Loose mounting
on pump and/
or motor 5.Other
transmission
elements loose
6.Pump or motor
defective
Foaming of the
hydraulic fluid
Bosch Rexroth AB, Installation and maintenance manual, Hägglunds DOb, RE 15327-WA/05.2017
14 Troubleshooting
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
Suction line
resistance excessive
because:-
1.Suction line
blocked or leaking
2.Fluid level too low
1. Suction line leaks
2. Fluid level too
low.
Pump
Pressure line
1.Pump is running
1.Line mounts
too fast
missing or loose
2.Maximum pump
2.Poor installation
pressure exceeded
3.Pipe bore too
3.Shaft seals, or
small
seals on suction side
4.Installation not
are defective
bled completely
4.Pump defective
5.Pressure and
return lines
connected wrongly
6.Control system
oscillating
7.Noise dampening
not incorporated in
design
n
1.Internal leakages
1.Leakages
due to wear
2.Excessive
2.Unsuitable type
line resistance
3.Pump defective
3.Pressure filter
4.Saftey block
blocked
pressure set too
low,
or control element
defective
1.Incorrect
1.Installation not
parameter values in
bled completely
the VFD
2.Pump defective
3.The regulator
doesn't work as
intended.
ve
1. Shaft seals on
the suction side are
defective.
Return line
1.Line mounts
missing or loose.
2. Poor installation
3.Pipe bore too
small 4.Installation
not bled
5. Filter blocked
1.Excessive line
resistance
2.Filter blocked
1.Excessive line
resistance
2.Filter blocked.
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