Operation and maintenance manual

Section 220-0100
6
Steering System - Flow Amplifier Valve
SM 1392 Rev 3 10-03
6. Remove spring stop (27), springs (28 & 29) and
spring guide (30) from directional spool (6).
7. Remove spring (26) from amplifier spool (8).
8. Remove plate (22) and discard 'O' rings (19, 20 & 25).
9. Remove directional spool (6), priority spool (7) and
amplifier spool (8) assemblies from housing (36).
Note: Directional spool (6), priority spool (7),
amplifier spool (8) and check valve (9), are not sold
separately and are supplied as part of an assembly
with housing (36). Further disassembly of the spools
is therefore not required.
Shock & Anti-cavitation Valves (5)
1. Prise shock & anti-cavitation valves (5) from
housing (36) with a screwdriver. Take care not to
damage valves or housing.
Note: Shock & anti-cavitation valve (5) is available
only as an assembly.
Orifices (4 & 12) and Throttle Check
Valve (11)
1. Unscrew orifice (4) from 'LS' port in housing (36).
2. Unscrew throttle check valve (11) from 'PP' port in
housing (36).
3. Unscrew orifice (12) from cover (14) face in
housing (36).
INSPECTION
Numbers in parentheses refer to Figs. 1 & 6.
Clean and examine all parts for wear and damage. If
directional spool (6), priority spool (7), amplifier spool
(8) or housing (36) are damaged beyond repair,
replace as a unit.
Replace all 'O' rings and seals.
ASSEMBLY
Numbers in parentheses refer to Figs. 1 & 6. Letters
in parentheses refer to Figs. 1 & 2.
Note: Before assembly, lubricate all parts with
hydraulic oil as specified in Section 300-0020,
LUBRICATION SYSTEM.
5. Clean outer area of the flow amplifier valve with a
suitable solvent. Ensure all hydraulic lines connected
to the flow amplifier valve are identified for ease of
installation and, with suitable containers available to
catch leakage, disconnect hydraulic lines. Fit
blanking caps to all open lines and fittings.
6. Disconnect mounting hardware securing flow
amplifier valve to the vehicle. Remove flow amplifier
valve to a clean area for disassembly.
DISASSEMBLY
Numbers in parentheses refer to Figs. 1 & 6. Letters
in parentheses refer to Figs. 1 & 2.
System Relief Valve (1)
1. Unscrew plug (31) and remove from housing (36).
Discard 'O' ring seal (32).
2. Unscrew system relief valve (1) and remove from
housing (36). Remove and discard 'O' ring seal (33)
from housing (36).
3. If required, hold system relief valve (1) body with
pipe pliers and unscrew adjusting screw from the body.
Counter Pressure & Anti-cavitation
Valve (2)
1. Unscrew plug (34) and remove from housing (36).
Discard 'O' ring (35).
2. Remove counter pressure & anti-cavitation valve (2)
from housing (36) by removing, small spring, steel ball,
piston housing and large spring, in that order.
Spools (6, 7 & 8)
1. Remove screws (15 & 17) and lockwashers
(16 & 18) securing cover (13) to housing (36).
Remove cover (13) from housing (36).
2. Remove spring stop (27), springs (28 & 29) and
spring guide (30) from directional spool (6).
3. Remove spring stop (23) and spring (24) from
priority spool (7).
4. Remove plate (21) and discard 'O' rings (19 & 20).
5. Remove screws (15 & 17) and lockwashers (16 & 18)
securing cover (14) to housing (36). Remove cover
(14) from housing (36).