TSE DPT60, Owner'S Manual

Page: 258 / 459

29
Series 90 Toubleshooting
Low Motor Output Torque
Check Description Action
1. System pressure at motor.
2. Variable motor stuck at minimum
displacement.
3. For internal leakage.
Low system pressure at the motor will
reduce torque.
Minimum motor displacement yields low
output torque.
Internal leakage will reduce system
pressure.
Measure system pressure at motor. If
pressure limiter setting is low, increase
setting.
Check control supply pressure or re-
pair displacement control. Check mo-
tor control orifices.
Check for leakage in O-rings, gaskets,
and other fittings. Repair unit as re-
quired, or replace leaky unit.
Improper Motor Output Speed
Check Description Action
1. Oil level in reservoir.
2. Pump output flow.
3. Variable motor displacement con-
trol.
4. For internal leakage.
Insufficient hydraulic fluid will reduce
motor speed.
Incorrect outflow will affect output
speed. Incorrect output flow indicates
the swashplate is out of position.
If variable motor displacement control
is not functioning correctly, variable
motor swashplate may be in wrong
position.
Internal leakage will reduce system
pressure.
Fill oil to proper level.
Measure pump output and check for
proper pump speed and see that the
pump is in full stroke.
See if variable motor displacement con-
trol is responding. If not, repair or re-
place control.
Check for leakage in O-rings, gaskets,
and other fittings. Repair unit as re-
quired, or replace leaky unit.
10. Pump displacement control.
11. System pressure.
12. System multi-function valves.
Control linkages are not secure, control
orifices are blocked, etc.
Low system pressure will not provide
power necessary to move load.
Defective multi-function valves will
cause system pressure to be low.
Repair or replace control module as
necessary.
Measure system pressure. Continue
with next step.
Repair or replace multi-function valve(s).
If the above actions do not remedy the problem
contact a SAUER-SUNDSTRAND Authorized Service Center.
If the above actions do not remedy the problem
contact a SAUER-SUNDSTRAND Authorized Service Center.
If the above actions do not remedy the problem
contact a SAUER-SUNDSTRAND Authorized Service Center.