1-42
TROUBLE SHOOTING 1.8
Universal joint between
engine and tandem
pump failure.
Problem Cause Corrective Action Section
Loss of hydraulic
power (no flow from
the gear pump).
Reservoir low on oil. Check for leaks. Fill the reservoir to the proper level. 1.8
7.11
1.4 / 2.9
2.10
8
Inspect and replace the damaged parts as required.
Check for proper alignment.
Gear pump not
functioning.
Inspect and replace damaged parts.
Splined coupling
failure in the
hydrostatic pump
See the Sauer Sundstrand Repair Manual BLN 9992.
Loss of hydraulic
power (full flow from
gear pump).
Auxiliary hydraulics
engaged.
Disengage the switch.
Relief valve failure or
out of adjustment.
Electrical failure. Check fuse, switches and wiring.
4.9
Check pressure. Adjust or repair as required. 1.4
Hydraulic action jerky. Reservoir low on oil. Check for leaks. Fill the reservoir to the proper level. 1.8
Control linkages loose
or worn.
Inspect, adjust or replace parts.
4
Air in hydraulic
system.
Check for leaks between the oil reservoir and pump.
Load check valve not
functioning.
Inspect and replace damaged parts. 1.4
Control valve spool
spring return mech-
anism not functioning
Inspect and replace damaged parts. 1.4
Control locks engaged Check fuse, safety switches and valve lock parts.
1.4 / 8
Boom raises slowly at
full RPM
Reservoir low on oil. Check for leaks. Fill the reservoir to the proper level.
1.8
Control linkages loose
or worn.
Inspect, adjust or replace parts. 4
Auxiliary hydraulics
engaged.
Disengage the switch.
4.9
Lifting more than rated
capacity.
Reduce the load.
Engine RPM too low. Check engine RPM and reset.
7.11
Relief valve failure or
out of adjustment.
Check pressure. Adjust or repair as required. 1.4
Cylinder seal(s) failure.
Check seals.
Check seals.
1.5
1.5
Internal leakage in the
control valve.
Inspect the control valve and repair as required. 1.4
Hydraulic cylinders
will not support a load.
(leak down)
Control valve spools
not centering.
Check control linkage and control valve spool spring
centering devise.
1.4 / 4
External leak between
control valve and
cylinders
Inspect and repair.
1.4
Cylinder seal(s) failure
Load check valve not
functioning.
Inspect and replace damaged parts.
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