saue
27
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.
CONTENTS
Summary of Contents for PTV100/72
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Page 54: ...Contents iv 032015 PN 4 ...
Page 175: ...Troubleshooting 70 35 032015 PN 133 ...
Page 187: ...Troubleshooting 70 47 032015 PN 145 ...
Page 205: ...Warranty DX EMISSIONS EPA 19 12DEC12 2 2 TS1721 UN 15JUL13 90 6 032015 PN 163 ...
Page 213: ...Warranty DX EMISSIONS CARB 19 01AUG14 8 8 RG26036 UN 24JUN14 90 14 032015 PN 171 ...
Page 214: ...Warranty 90 15 032015 PN 172 ...
Page 220: ...Engine Registration IBC 2 032015 PN 178 ...
Page 223: ...Engine Registration IBC 5 032015 PN 181 ...
Page 224: ...Engine Registration IBC 6 032015 PN 182 ...
Page 225: ...SERVICE MANUAL ...
Page 262: ...saue Axial Piston Pumps and Motors Service Manual Series 90 CONTENTS ...
Page 348: ...saue 87 Series 90 Exploded View Parts Drawings 10 Notes CONTENTS ...
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