Section 220-0000
Steering System - Steering Schematic
SM 1943 4-00
2
Priority Valve (5)
Refer to Section 220-0105, PRIORITY VALVE.
The priority valve is mounted off the rear right hand
fender support. The valve is installed in the lines
between the steering valve (4) and body control valve.
Hydraulic oil is pumped to the priority valve (5) and
depending on the position of the spool within the
priority valve (5), oil is directed to the steering or body
hoist systems.
There are six ports on the priority valve housing as
follows:
Port 'P' - Pump Inlet Port - Supply from pump
Port 'PP' - Pilot Pressure - Plugged
Port 'CF' - Control Flow - Supply to steering valve
Port 'EF' - Excess Flow - Supply to body hoist valve
Port 'LS' - Load Sensing - To LS port on steering valve
Port 'T' - Relief Return - Return to tank
Emergency Valve (6)
Refer to Section 220-0140, EMERGENCY VALVE.
Mounted off the right hand cab leg, the emergency
valve forms part of the emergency steering system. It
is connected to the main output line of the ground
driven Emergency Steering Pump (3) mounted on
the transmission.
Steering Cylinders (7)
Refer to Section 220-0120, STEERING CYLINDER.
There are two single stage, double acting steering
cylinders on the machine. The cylinder base end is
connected to the articulation and oscillation pivot, and,
the piston rod end is connected to the front frame.
Single stage double acting means that the piston rod
can have oil applied to either side, extending or
retracting the piston rod.
Cylinder mounting is by pins, spacers, seals and,
spherical bearings secured with circlips. Spherical
bearings permit a limited amount of cylinder
misalignment when travelling over rough terrain.
Diagnostic Test Point
Mounted on the rear right hand side of the tractor
frame are diagnostic test points. The steering system
has one diagnostic test point which enables the
service engineer to obtain an accurate steering system
pressure reading.
Steering system pressure is set at 241 bar (3 500 lbf/in²).
'O' RING FACE SEALS (ORFS)
Where hydraulic lines are fitted with ORFS
connections, the following procedure should be carried
out during 'Installation'. Refer to Fig. 1.
SM - 1335
FITTING
NUT
TUBE
'O' RING
'O' RING
SLEEVE
Fig. 1 - Assembly of Typical ORFS Connector
a. Ensure 'O' ring/seal is in place and that the joining
surfaces are clean. If necessary, retain 'O' ring/seal in
place with a light coating of grease or vaseline.
b. Initially, the nuts should be tightened by hand.
c. Where a hose is fitted, ensure that it is not twisted or
kinked when the nuts are tightened so that it is allowed
to adopt a natural position.
d. Where a tube is fitted, ensure that the connection is
aligned correctly.
e. Tighten the nut a further 1/4 to 1/2 a turn using the
correct size spanner (wrench).
f. Check that a satisfactory hose or tube routing has
been achieved.
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