RE 15345-WA, Version 11.2022, Bosch Rexroth AB
Troubleshooting |
Drive system Hägglunds Fusion 67/72
Causes Of Trouble And Its Effect In The Hydraulic Installation
Pressure Valves
Flow Control
Valves
Directional
Control Valves
Fluid
Motor
Others
1. Valve chatter
due to dirt on valve
seal
2. Insufficient
damping
(unsuitable flow)
3. Flow noises
when operating
4. Unsuitable
characteristic curve
5. Wrong design
1. The valve
oscillates and
excites other
control elements
into oscillation
2. Flow noises 3.
Control system
oscillating
1. Valve chatters
due to defective
solenoid or the
voltage is too low
2. Valve defective
due to dirt or wear
3. Flow through
valve is excessive
4. Pilot pressure
variations
5. On valves with
adjustable damping
the adjustment
has not been
performed
6. Check the
electrical controls
1. Cavitation
problems due to
low fluid level or
viscosity too high.
(fluid temperature
is too low)
2. Fluid is
contaminated
and dirty leading
to damage and
blockage of
equipment
3. Fluid foams
1. Wear of running
surfaces
2. Control system
oscillating
1. Operating
pressure set too
low
2. Internal leakage
due to wear
3. Dirty or
damaged valve seat
4. Broken spring
5. Unsuitable type.
(setting too low)
1. Pressure losses
excessive
2. False setting
3. Valve defective
4. Unsuitable type
1. Wrong switched
position (eg
pressureless)
2. Solenoid
defective
3. Internal leakage
due to wear
4. Excessive fluid
velocity
5. Spool jams
1. Viscosity too
low, causing
excessive leakage.
2. Viscosity too
high causing
excessive flow
resistance
3. Fluid foams.
1. Internal Leakage
2. Wear or running
surfaces
3. Excessive
internal friction
causing low
efficiency
1. In the case of
pressure controls
there is a defect
in the open (or
closed) loop
control circuit
2. Display
instruments are
defective
1. Valve chatter
due to dirt on valve
seat or valve worn
2. Insufficient
damping
(unsuitable type)
3. Excessive length
of undamped
remote control line
4. Unsuitable
remote- control
valve
1. Valve dirty
2. Pressure losses
excessive
1. Valve chatters
due to defective
solenoid or the
voltage is too low
2. Valve defective
due to dirt or wear
3. Flow through
valve is excessive
4. Pilot pressure
variations
5. Adjustable
damping on valves,
has not been set
6. Check the
electrical controls.
1. Hydraulic fluid
dirty
2. Hydraulic fluid
foams.
1. Stick-slip effect
due to friction
2. Operation
below minimum
recommended
motor speed.
1. Insufficient
load counter-
balance (eg
lowering control
valve)
1. Unsuitable fluid
for the duty.