H-19
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
*Thermal shock - A condition caused when the hydraulic system is operated for some time without turning
the steering wheel so that fluid in the reservoir and system is hot and the steering control unit is relatively
cool (more than 50
0
C temperature differential). When the steering wheel is turned quickly the result is
temporary seizure and possible damage to internal parts of the steering control unit. The temporary seizure
may be followed by total free wheeling.
Broken or worn linkage Check for loose fitting bearings
between cylinder and steered and anchor points in steering
wheels. linkage between cylinder and
steered wheels.
Leaky cylinder seals. Replace cylinder seals.
High back pressure in tank line Revise circuit return line.
can cause slow return to center.
Should not exceed 300 psi.
Large particles can cause Clean the unit and filter the oil.
binding between the spool If another component has failed
and sleeve. generating contaminants, flush
the system while bypassing the
steering control unit.
Large particles in meter section. Clean the unit.
Insufficient hydraulic power Check hydraulic power supply.
(units over 15 in
3
).
Severe wear and/or broken pin. Replace the unit.
*Thermal shock. Replace the unit.
Parts assembled wrong. Correct it.
Steering unit improperly timed. Correct timing.
Lines connected to wrong ports. Reconnect lines correctly.
Lines connected to wrong Reconnect lines correctly.
cylinder ports.
No inlet check valve on Install a check valve.
steering control unit.
9. TROUBLE SHOOTING (Contd.)
TROUBLE PROBABLE CAUSE REMEDY REF.
K. Excessive free
play at
steered
wheels.
L. Binding or
poor
centering of
steering
wheel.
M. Steering unit
locks up.
N. Steering
wheel
oscillates or
turns by
itself.
O.
Steered wheels
turn in wrong
direction when
operator
activates
steering
wheel.
P. Steering
wheel kicks
at start of
steering.
Steering
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