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Section E
60 - 7
Removal and Replacement
Precision Control (Servo)
!
DANGER
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses, stop the
engine and operate the controls to release pressure
trapped in the hoses. Make sure the engine cannot be
started while the hoses are open.
INT-3-1-11/1
Removal
It is recommended that the valve is removed complete with
its mounting plate. The assembly is lowered down and then
out from under the rear on the machine. Before commencing
make sure that there is sufficient clearance between the
machine and the ground. If necessary raise the rear of the
machine using the stabilisers. Chock the machine securely,
remembering to leave access for removal of the valve
assembly.
The illustration is viewed from the bottom.
Before proceding, vent the hydraulic pressure as follows:
1
Stop the engine. With the operator seat set in the rear
facing position (for backhoe operation), switch the
starter to ON without starting the engine. Operate the
joystick controls several times to vent the hydraulic
pressure from the servo system and backhoe rams.
2
Operate the stabiliser controls several times to vent
pressure from the stabiliser rams.
3
Turn the starter switch to the OFF position and remove
the key.
! WARNING
Make the machine safe before working underneath it.
Park the machine on level ground, lower the arms. Apply
the parking brake, put the transmission in neutral and
stop the engine. Chock both sides of all four wheels.
Disconnect the battery, to prevent the engine being
started while you are beneath the machine.
GEN-1-2
To avoid damage to the pilot supply valve (shown at A),
remove it as follows:
1
Carfully tag all the hoses connected at the valve. Record
the phasing. Disconnect the hoses.
2
Uncouple the solenoid electrical connector 1.
3
Undo the two fixing bolts 2 and remove the valve.
9803/3280
Hydraulics
Excavator Valve
Purchased from www.WorkshopManuals.co.uk
Disconnect the stabiliser spool control cables 3 as follows:
1
Undo the lock nut 4.
2
Undo the housing retaining screws 5 and slide the
housing down the cable.
3
Push out the cable connecting pin 6 and disconnect
the cable at the spool. Tie the cables out of harms way.
Remove the excavator valve as follows:
1
For access remove bolts 7 and tie hose guard 8 out of
the way.
2
Uncouple electrical connection to the rear horn 9.
3
Uncouple electrical connection 10 to the hydraclamp
solenoid.
4
Record the phasing of the pilot hoses 11 connected at
the top and bottom of the excavator valve. The hoses
should be labelled, if not label each hose before
disconnecting, this will ensure correct position when
refitting. Disconnect all hydraulic pilot hoses from the
valve block and plug all open ends and ports to
prevent ingress of dirt.
5
Record the phasing of the service hoses connected at
the front of the excavator valve. Label each hose
before disconnecting, this will ensure correct position
when refitting. Disconnect all the hoses from the valve
block and plug all open ends and ports to prevent
ingress of dirt.
6
Disconnect the inlet 13 and tank return 14 hoses from
the valve block, plug all open ends and ports to
prevent ingress of dirt.
7
Loosen the three mounting plate bolts 15 - DO NOT
completely remove the retaining bolts.
! CAUTION
This component is heavy. Do not attempt to remove it
unless its weight is held by a sling. Make sure that the
sling is attached to a suitable lifting appliance.
HYD 2-3/1
8
Open the rear window. Remove the access plate in the
cab floor above the excavator valve. Attach a suitable
sling to the mounting bracket slinging point, make sure
that the weight of the valve is supported by the sling
(shown at B).
9
Remove bolts 15 and lower the valve block to the
ground.
10
If the hose adaptors are going to be removed from the
valve block, label before removing to ensure
replacement in the correct ports. Record the positions
of any restrictors.
Section E
60 - 7
Issue 2*
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