TROUBLESHOOTING
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 1C-35
ZF / Hurth Hydraulic Transmission (continued)
Trouble Possible Cause Remedy
4. Transmission is
blocked
4. A. Medium piston ring in
input shaft in control block
is faulty
4. A. Remove control block,
replace piston ring,
replace control block if
worn
5. Output shaft turns
in neutral position
5. A. Rotary slide valve in
control block is worn
5. A. Replace control block
B. Faulty needle bearing
on input shaft
B. Disassemble
transmission and input
shaft, replace bearing
C. Dished discs due to
over-heating of slipping
clutch
C. Refer to Number 3
6. Shifting pressure
too low
6. A. Fluid filter dirty 6. A. Replace fluid filter
B. Fluid level in
transmission is too low
B. Fill with fluid; check for
fluid loss
transmission,cooler and
pipelines lines for leaks
also refer to steps Number
10 to Number 13
C. Fluid pump is worn out C. Replace control block
together with fluid pump
D. Piston rings in input
shaft in control block are
faulty
D. Remove control block
and replace piston rings.
also replace control block
E. Piston rings in clutch
are faulty
E. Disassemble
transmission, replace
clutch
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