Operation and maintenance manual

Section 230-0060
SM 1410 Rev 2 2-02
5
(20) to end caps (10 & 17) using capscrews (22).
8. Install pressure reducing valves (13) to mounting
blocks (20) and secure using capscrews (14). Tighten
capscrews (14) to a torque of 2 Nm (1.5 lbf ft).
Relief Valve
1. Install new 'O' rings (38 & 39) on relief valve (37)
assembly. Install relief valve (37) assembly into relief
valve bore in valve housing (41).
Note: Push relief valve (37) assembly fully in until the
snap ring on the outer sleeve locates in the recess in
the relief valve bore.
2. Install a new 'O' ring (36) on plug (40) and install
plug (40) in valve housing (41). Tighten plug (40) to a
torque of 150 Nm (110 lbf ft).
3. Install poppet spring (32) and poppet (33) in cap
(34). Install a new 'O' ring (36) on cap (34).
4. Install cap (34) assembly, adjusting screw (30) and
locking nut (29) in valve housing (41) bore. Tighten
cap (34) to a torque of 150 Nm (110 lbf ft).
5. Leave adjusting screw loose prior to pressure
setting. Refer to 'Adjustments' for correct pressure
setting.
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
Note: Tighten all hydraulic lines fitted with ORFS
connections, as described in Section 220-0000,
STEERING SYSTEM SCHEMATIC. Renew all
'O' rings where used.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
1. Using a suitable lifting device, position body control
valve in place on the machine. Secure body control
valve to the cradle assembly with mounting hardware
as removed at 'Removal'.
Body System - Body Control Valve
2. Reconnect all servo control lines to body control
valve, as tagged at 'Removal'.
3. Install new 'O' rings in split flange line fittings and
install all hydraulic lines to body control valve, as
tagged at 'Removal'.
Note: Be sure to use new 'O' rings with the split flange
fittings.
4. Fill hydraulic oil tank with hydraulic oil as specified
in Section 300-0020, LUBRICATION SYSTEM. Refer
to Section 230-0040, HYDRAULIC TANK, for hydraulic
oil levels. Install filler cap on hydraulic tank filler neck.
5. Adjust the system relief valve according to the
instructions in 'Adjustments'.
ADJUSTMENTS
Numbers in parentheses refer to Fig. 1.
Relief Valve Adjustment
This type of relief valve is very sensitive to adjustment.
Relief valve setting and adjustment can be carried out
as follows:
Note: If adjustment only is to be carried out, the
procedure for blocking the machine as described in
'Removal, must be strictly adhered to.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
1. Connect a hydraulic gauge, capable of recording a
pressure of 0 - 207 bar (0 - 3 000 lbf/in²), to remote
diagnostic pressure point.
2. Start engine and raise body completely.
3. Check reading on pressure gauge. Slacken locking
nut (29) and turn adjusting screw (30) until a pressure
reading of 172 bar (2 500 lbf/in²) is recorded on the
pressure gauge.
Note: Turning adjusting screw (30) 'IN' will increase
relief valve pressure, turning adjusting screw (30) 'OUT'
will reduce relief valve pressure.
4. Secure locking nut (29) in place and operate body.
Re-check relief valve pressure and adjust if required.