Key
A 70 - 100 mm (2.7 - 3.9 in)
B 3 - 6 mm (0.12 - 0.24 in)
C 30 - 40 mm (1.18 - 1.57 in)
D 22 mm (0.87 in)
Before Assembly
Check that excessive force is not placed on the valve from
the piping.
Tighten installation bolts diagonally.
Do not remove the blanking plugs until installation to prevent
foreign matter from entering the piping.
Before assembly, check the quantity of the parts, installation
positions and necessary tools.
Assemble the component sub-assemblies before
assembling the main body of the valve housing.
33 - 1
Control Valves
Dismantling and Assembly
! WARNING
Hydraulic Pressure
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses or
couplings, vent the pressure trapped in the hoses in
accordance with the instructions given in this
publication.
HYD 1-5
Before Dismantling
Before working on the hydraulic system, ensure that the
engine is switched off and the starter key removed.
Disconnect all hydraulic hoses from valve ports. Seal
exposed connections to prevent the ingress of dirt. Mark the
hoses to ensure correct re-connection.
Note:
1 Ensure all work surfaces are clean.
2 Discard and renew all seals, ‘O’-rings and back-up
rings.
3 Lubricate all new seals and ‘O’-rings on assembly,
using a suitable grease or clean hydraulic oil and
ensure seals are firmly and correctly seated.
4 During dismantling, ensure all components are clearly
identified to assist assembly.
5 Handle components and sub-assemblies with care,
they are precision made and are easily damaged.
6 Prior to assembly, all components should be liberally
coated with hydraulic oil to ensure full movement
between moving parts.
7 Ensure screws and bolts are tightened to the correct
torque figures to prevent distortion of parts.
8 After dismantling, use a suitable solvent to clean all
components, dry using compressed air.
9 Torque tightening values in assembly procedures are for
threads lubricated with hydraulic oil.
10 To prevent surface damage when working on spools,
ensure they are encased in protective wooden blocks
as detailed opposite.
Section E Hydraulics
9803/6020
Section E
33 - 1
Issue 1
Control Valve
JS01510
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