50 - 3
Assembly
1
Fit spool
15
into sleeve
12
, aligning slots for centring
springs
13
and checking that the small marks
X
are
aligned . Ensure t hat t hree slot s in sp ool p art ially
uncover three holes in sleeve, as at
A
.
2
Fit two flat centring springs
13
with four curved springs
between them, as shown at
B
.
3
Fit seal
24
into steer unit body and insert sleeve of
service tool 892/00180. Fit back up ring
20
and seal
21
onto plastic boss, and position on tool spindle, as
shown.
4
Lower steering unit body and tool sleeve over tool
spindle until plastic bush is flush with end of bore.
Assemble sleeves
12
and
15
with cross pin
14
and
centring springs
13
. Fit bearing components
16
to
19
with chamfered face of
17
facing away from bearing
18
.
5
Remove body from tool leaving plastic bush in position,
and lower body over assembled spool.
6
Apply downward pressure on body until plastic boss is
forced out of bore, leaving seals correctly located.
Section H
9803/3280
Section H
50 - 3
Issue 1
Hydraulic Steer Unit
Dismantling and Assembly
The numerical sequence shown on the illustration is intended as a guide to dismantling.
Note: 1
During manufacture, a small mark
X
will have been made on sleeve
12
and spool
15
, close to one of the slots for the
centring springs
13
. Before removing the centring springs, check that this mark is visible; if not, make a new mark to ensure
correct assembly.
Note: 2
Shock valves (items
29
to
35
) are pressure set during manufacture and the adjusting screw
31
secured with Loctite.
Due to the difficulty of resetting the pressure it is recommended that the valves are not disturbed. If dismantling is
unavoidable, however, measure and record the depth of adjusting screw
31
below the top face of the steering unit before
removing the screw.
Note: 3
The unit illustrated in the following sequence represents a typical hydraulic steer valve. The relief valve (items
25
to
28
) and shock valves (items
29
to
35
) are not therefore shown in the following illustrations.
X
S229680
S229690