TSE DPT60, Owner'S Manual

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27
Series 90 Toubleshooting
Troubleshooting
This section provides general steps to follow if certain undesirable system conditions are observed. Follow the steps in
a section until the problem is solved. Some of the items will be system specific. For areas covered in this manual, a section
is referenced.
Always observe the safety precautions listed in the section "Introduction" and related to your
specific equipment.
"NEUTRAL" Difficult or Impossible to Find
Check Description Action
1. Input to pump control.
2. Pump displacement control.
Input to control module is operating
improperly.
Control linkages are not secure, control
orifices are blocked, etc.
Check control input and repair or re-
place as necessary.
Adjust, repair, or replace control mod-
ule as necessary.
System Operating Hot
Check Description Action
1. Oil level in reservoir.
2. Heat exchanger.
3. Charge pressure.
4. Charge pump inlet vacuum.
5. System relief pressure settings.
6. For internal leakage in motor.
7. System pressure.
Insufficient hydraulic fluid will not meet
cooling demands of system.
Heat exchanger not sufficiently cooling
the system.
Low charge pressure will overwork sys-
tem.
High inlet vacuum will overwork sys-
tem. A dirty filter will increase the inlet
vacuum. Inadequate line size will re-
strict flow.
If the system relief settings are too low,
the relief valves will be overworked.
Leakage will reduce low side system
pressure and overwork the system.
High system pressure will overheat
system.
Fill reservoir to proper level.
Check air flow and input air tempera-
ture for heat exchanger. Clean, repair
or replace heat exchanger.
Measure charge pressure. Inspect and
adjust or replace charge relief valve. Or
repair leaky charge pump.
Check charge inlet vacuum. If high,
inspect inlet filter and replace as neces-
sary. Check for adequate line size,
length or other restrictions.
Verify settings of pressure limiters and
high pressure relief valves and adjust
or replace multi-function valves as nec-
essary.
Monitor motor case flow without loop
flushing in the circuit (use defeat spool).
If flow is excessive, replace motor.
Measure system pressure. If pressure
is high reduce loads.
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.