Operation and maintenance manual

Section 220-0090
Steering System - Steering Valve
SM 1391 5-98
4
from sleeve (11) and spool (9).
10. Carefully remove spool (9) from sleeve (11) and
press neutral position springs (12) from spool (9).
11. Remove and discard seal ring (1), 'O' ring (5) and
kin ring (6) from valve housing (2).
INSPECTION
1. Clean all parts in a suitable solvent and dry with
clean, lint free cloths.
2. Check all parts for wear or damage and replace if
necessary.
ASSEMBLY
Numbers in parentheses refer to Figs. 1 & 3.
Note: Tighten all fasteners without special torques
specified to torques listed in Section 300-0080,
STANDARD BOLT AND NUT TORQUE
SPECIFICATIONS.
Note: Before assembly, lubricate all parts with
hydraulic oil as specified in Section 300-0020,
LUBRICATION SYSTEM.
1. Install the two flat neutral position springs (12) in
their slot in spool (9). Install the curved neutral position
springs (12) between the flat ones and press into
place.
2. Line up neutral position spring (12) set.
3. Guide spool (9) into sleeve (11).
Note: When assembling spool (9) and sleeve (11) only
one of two possible ways of positioning neutral
position springs (12) slot is correct. There are three
slots in spool (9) and three holes in sleeve (11) in the
end opposite to neutral position springs (12) slot.
Place the slots and holes opposite each other so that
parts of the holes in sleeve (11) are visible through the
slots in spool (9).
4. Press neutral position springs (12) together and
push into place in sleeve (11). Line up neutral position
springs (12) and centre them.
5. Install ring (8) down over sleeve (11). Ensure ring (8)
rotates free of neutral position springs (12).
6. Install cross pin (10) into spool (9) and sleeve (11)
assembly.
SM - 537
7. Install bearing assembly (7) on spool (9) as shown
in Fig. 4.
8. Turn valve housing (2) until spool (9) and sleeve
(11) bore is horizontal. Using assembly tool shown in
Fig. 7, guide the outer part into valve housing (2) bore.
9. Install new kin ring (6) and 'O' ring (5) on assembly
tool guide. Install the guide in inner part of assembly
tool.
10. Hold the outer part of the assembly tool in the
bottom of valve housing (2) and guide the inner part of
the tool until it bottoms.
11. Press and turn 'O' ring (5) and kin ring (6) into
position in valve housing (2).
12. Draw the inner and outer parts of the assembly
tool out of valve housing (2) bore, leaving the guide
from the inner part in the bore.
13. With a light turning movement guide spool (9) and
sleeve (11) assembly into valve housing (2).
Note: Install spool (9) and sleeve (11) assembly with
cross pin (10) in the horizontal position.
14. Spool (9) and sleeve (11) assembly will push
assembly tool guide out of valve housing (2) when
installed. 'O' ring (5) and kin ring (6) are now installed
in position.
Fig. 4 - Installation of Bearing Assembly
1 - Outer Bearing Race
2 - Needle Bearing
3 - Inner Bearing Race
4 - Spool
5 - Sleeve