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Series 90 Troubleshooting 7
7.2 System Operating Hot
Item Description Action
7. 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 Sec. 1.2 and related to your
specific equipment.
7.1 "Neutral" Difficult or Impossible to Find
Item Description Action
1. Check input to pump
control.
2. Check pump displace-
ment control.
3. Repair or replace
pump.
Input to control module is operating
improperly.
Control linkages are not secure, con-
trol orifices are blocked, etc.
1. Check oil level in reser-
voir.
2. Inspect heat ex-
changer.
3. Check charge pres-
sure.
4. Check charge pump
inlet vacuum.
5. Check system relief
pressure settings.
6. Check for internal leak-
age in motor.
7. Check system pres-
sure.
8. Replace transmission.
Fill reservoir to proper level.
Check air flow and input air temperature for
heat exchanger. Clean, repair or replace
heat exchanger.
Measure charge pressure (4.2). Inspect
and adjust or replace charge relief valve
(8.1.1 and 9.2.3). Or repair leaky charge
pump (9.2.4).
Check charge inlet vacuum (4.2). 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 necessary (8.1.2,
9.2.1)
Monitor motor case flow without loop flush-
ing in the circuit (use defeat spool 9.4.1.3).
If flow is excessive, replace motor.
Measure system pressure (4.2). If pres-
sure is high reduce loads.
Replace pump and motor.
Insufficient hydraulic fluid will not
meet cooling demands of system.
Heat exchanger not sufficiently cool-
ing the system.
Low charge pressure will overwork
system.
High inlet vacuum will overwork sys-
tem. A dirty filter will increase the
inlet vacuum. Inadequate line size
will restrict flow.
If the system relief settings are too
low, the relief valves will be over-
worked.
Leakage will reduce low side system
pressure and overwork the system.
High system pressure will overheat
system.
Check control input and repair or replace
as necessary.
Adjust, repair, or replace control module as
necessary (8.2 and 9.3).
Consult a Sauer-Sundstrand Authorized
Service Center.
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