Operation and maintenance manual

Section 220-0100
8
Steering System - Flow Amplifier Valve
SM 1392 Rev 3 10-03
position in place on cover (14) end of housing (36).
10. Secure cover (14) on housing (36) with
lockwashers (16 & 18) and screws (15 & 17). Tighten
screws (15) to a torque of 80 ± 10 Nm (710 ± 90 lbf in)
and screws (17) to 25 ± 5 Nm (220 ± 45 lbf in).
11. Install spring (24) and spring stop (23) on priority
spool (7) at cover (13) end of housing (36).
12. Install spring guide (30), springs (28 & 29) and
spring stop (27), in that order, on directional spool
(6), at cover (13) end of housing (36).
13. Install new 'O' rings (19 & 20) on plate (21) and
position in place on cover (13) end of housing (36).
14. Secure cover (13) on housing (36) with
lockwashers (16 & 18) and screws (15 & 17). Tighten
screws (15) to a torque of 80 ± 10 Nm (710 ± 90 lbf in)
and screws (17) to 25 ± 5 Nm (220 ± 45 lbf in).
15. Install counter pressure & anti-cavitation valve
(2) in port 'A' of housing (36) as follows:
a. Smear large spring with vaseline and install in
piston housing. Install piston housing assembly in
housing (36).
b. Insert steel ball in piston housing.
c. Insert new 'O' ring (35) on plug (34) and insert
small spring in plug (34).
d. Install plug (34) assembly in housing (36) and
tighten to a torque of 25 ± 3 Nm (220 ± 25 lbf in).
16. If removed, install adjusting screw in system
relief valve (1) body, as removed at disassembly.
17. Install new 'O' ring seal (32) in port 'B' of housing (36).
18. Screw system relief valve (1) into port 'B' in
housing (36). Tighten system relief valve (1) to a
torque of 30 ± 3 Nm (265 ± 25 lbf in).
19. Install new 'O' ring seal (32) on plug (31) and
secure in housing (36). Tighten plug (31) to a torque
of 60 ± 5 Nm (530 ± 45 lbf in).
INSTALLATION
Note: Tighten all fasteners without special torques
specified to 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 blocking materials and lifting
equipment are properly secured and of
adequate capacity to do the job safely.
1. Install flow amplifier valve on the vehicle and
secure with mounting hardware removed during
removal.
2. Connect hydraulic lines and tubes to flow amplifier
valve, as tagged at removal.
3. Fill hydraulic oil tank with hydraulic oil as specified
in Section 300-0020, LUBRICATION SYSTEM. Install
filler cap on hydraulic tank.
4. Place the battery master switch in the 'On'
position, remove all wheel blocks, start the engine
and operate steering and body systems. Check
hydraulic lines and tubes for leaks. Tighten as
required.
5. Check hydraulic tank oil level and replenish as
required.
RELIEF VALVE - PRESSURE CHECK
Numbers in parentheses refer to Figs. 1 & 6.
1. Attach a 276 bar (4 000 lbf/in²) pressure gauge to
remote steering pressure check point at the rear left
hand side of the tractor frame.
2. With the engine and hydraulic oil at operating
temperature, continuously steer into the LH stop at full
throttle. The pressure should rise to 206 bar (3 000 lbf/
in²) and remain stable. Repeat this test 10 - 12 times.
3. Repeat the above test, continuously steering into
the RH stop.
4. If required, adjust relief valve pressure as follows:
a. Remove plug (31) from housing (36).
b. Screw adjusting screw with an allen key,
clockwise to increase the pressure reading, or
anticlockwise to reduce the pressure reading.