50 - 4
Section H Steering
9803/3280
Section H
50 - 4
Issue 1
Hydraulic Steer Unit
Assembly (Continued)
7 Invert unit and place on a suitable hollow support so
that body does not rest on protruding sleeve, thus
preventing displacement of the new seals. Place ball 23
into check valve hole and fit bush 22.
8 Fit new 'O' ring 10.
9 Fit distributor plate 9 ensuring that holes align. Locate
shaft 11 onto cross-pin 14, noting position of slot.
When rotor 7 is fitted, slot must align with hollows of
rotor as shown at C.
10 Use a suitable piece of rigid flat material, 0.25mm
(0.010 in.) thick, to support the shaft and ensure
positive engagement with the splines of rotor 7.
11 Locate rotor onto shaft, ensuring alignment as at C. Fit
spacing bush 6 into rotor.
12 Fit 'O' rings 4 and 8 each side of body 5, then position
body over rotor.
13 Refit the end plate and fit at least one bolt 2 before
removing support material.
14 Fit remaining bolts, ensuring that special bolt 1 is
correctly located. Tighten all bolts to 29Nm (22 lbf ft).
S229700
Pressure Relief Valve Cartridge
After renewing the 'O' ring, torque tighten the cartridge to 50 Nm (37 lbf ft). The relief valve is preset, refer to
Technical Data for the valve setting. The relief valve setting should be rechecked after fitting the steering unit to the
machine. Refer to Service Procedures, Steer System - Pressure Testing.
Shock Valves
If the shock valves have been dismantled, clean the threads of adjusting screw 31 and the threads in the bore of the steering
unit body using JCB Cleaner/Degreaser, allow to dry. Assemble seat 35, ball 34, cap 33 and spring 32 then coat threads of
screw 31 with JCB Threadlocker and Sealer. Assemble screw to depth measured during dismantling then fit plug 29 and
washer 30.
S229710
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