Operation and maintenance manual

Section 230-0060
Body System - Body Control Valve
SM 1410 Rev 2 2-02
4
7. Remove capscrews (12) securing end cap (10)
assembly to valve housing (41). Remove end cap (10).
If required, remove bolts (45) and end plate (46) from
end cap (10). Remove and discard 'O' ring (47).
8. Carefully withdraw spool and spring pack assembly
from valve housing (41). Remove and discard 'O' rings
(3 & 5).
Note: 'O' rings (3 & 5) can be replaced without
disassembly of the spring mechanism.
9. If necessary, the centring mechanism can be
removed from the spool assembly. Remove shoulder
screw (9) to release washer (8), spring seats (6),
spring (7) and shims (15 & 16).
Relief Valve
1. Clean the entire body control valve assembly with a
suitable solvent and dry thoroughly. Remove caps
from valve housing (41) ports.
2. If desired, clamp body control valve assembly in a
soft jawed vice. Take care to avoid damaging valve
housing (41) machined surfaces.
3. Release locking nut (29) and slacken adjusting
screw (30) until loose.
4. Remove cap (34) from valve housing (41) and
discard 'O' ring (36).
5. Withdraw spring (32) and poppet (33) from valve
housing (41) bore.
6. Remove plug (40) from the opposite end of valve
housing (41) and discard 'O' ring (36).
7. Push out relief valve (37) assembly from bore in
valve housing (41). Discard 'O' rings (38 & 39).
INSPECTION
Numbers in parentheses refer to Fig. 1.
1. Clean all parts thoroughly and examine for wear
and/or damage.
2. Inspect valve housing (41) bores and control spool
(1) for grooves, deep scratches or excessive wear.
Note: If condition of valve housing (41) bores or
control spool (1) indicates that they require to be
replaced, the body control valve should be replaced as
an assembly.
3. If either poppet (33) or relief valve (37) are damaged,
BOTH parts should be replaced by new parts.
Note: Do not lap or grind poppet (33) to relief valve
(37) assembly.
ASSEMBLY
Numbers and letters in parentheses refer to Fig. 1.
Note: Lightly lubricate all components with hydraulic
oil. Refer to Section 300-0020, LUBRICATION
SYSTEM, for recommended oil specifications.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
Valve Body
1. If removed, install new 'O' ring (26) on port 'B' of
valve housing (41). Install blanking plate (25) and
secure using bolts (23) and lockwashers (24).
3. If removed, install new 'O' ring (28) on port 'F' of
valve housing (41). Install cover plate (27) and secure
using bolts (23) and lockwashers (24). If removed,
install plug (42) and new seal (43) to cover plate (27).
Control Spool
1. If required, reassemble spring seats (6), shims
(15 & 16), spring (7) and washer (8) and secure
assembly to spool cap (4) using shoulder screw (9).
Note: Apply 3 drops of Loctite 243 to the spool cap (4)
threads prior to reassembly.
2. Replace 'O' rings (3 & 5) on spool and spring pack
assembly.
3. Refit spool and spring pack assembly to valve
housing (41).
4. Install end cap (10) to valve housing (41) and
secure using capscrews (12). Tighten capscrews (12)
to a torque of 30 Nm (22 lbf ft).
5. If removed, fit new 'O' ring (47) and install end plate
(46) on end cap (10) using capscrews (45). Tighten
capscrews (45) to a torque of 30 Nm (22 lbf ft).
6. If required, install new 'O' ring (18) on plug (19) and
refit to mounting block (20).
7. Install new 'O' rings (21) and secure mounting blocks