5 - 2
Removal and Replacement
up to machine no. 807225
Slew Cylinder - Removal
Position the machine on firm level ground, rest the front
shovel on the ground and position the excavator bucket just
above the ground. Stop the engine. Operate the excavator
controls to vent residual hydraulic pressure.
Release the hydraulic connections to the slew cylinders.
Unscrew and remove capscrews 1 from each slew cylinder 2.
Position an oil tray underneath the kingpost to catch any oil
lost during dismantling.
Withdraw the cylinders by manually swinging the excavator
assembly to one side and then the other. This will push off
each cylinder in turn.
Remove rack seals 3 as each side of the rack 4 is exposed.
Kingpost - Removal
If required, remove the boom and dipper (see pages B/3-1
and B/4-1).
Note: Unless the kingpost is to be renewed, it is not
necessary to remove the boom and dipper to release the
kingpost from the machine.
!
!
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
At the kingpost, disconnect and plug the hydraulic hoses,
marking the hoses to ensure correct reconnection (see page
E/2-1).
Position an oil tray underneath the kingpost to catch any oil
lost during dismantling. Remove capscrews 5 and lift off the
thrust cap 6 complete with filler tube assembly 7.
Slacken and remove the pinion capscrews 8.
Support the backhoe by placing a sling from a crane around
the boom ram to kingpost pivot. (If the boom and dipper
have been removed, place the sling around the kingpost.)
Remove locking bolt 9 and kingpost pivot pin 10.
Using the crane, lift the excavator assembly up which will
free the pinion from the carriage base then pull the assembly
back away from the carriage, taking care to collect shim 11.
Note: Shim 11 is not fitted to later machines.
Remove pinion 12 and thrust washer 13 from the kingpost.
Remove the anti-rotation pin 14 and withdraw the rack 4.
Kingpost - Replacement
Repacement is a reversal of the removal procedure.
If bushes 16,17 or 18 are to be renewed, coat outside
diameter with JCB Multi-Gasket before pressing into
position.
Note: On later machines, bush 18 was changed to a flanged
type and is fitted with a thrust washer as shown at X. The
flanged type bush may be fitted to earlier machines provided
the thrust washer is also fitted.
Lubricate the pinion and rack with gear oil before assembly.
Apply JCB Special MPL grease to pivot pin 10.
Check that shim 11 is the latest steel type; replace if not.
Note: Shim 11 is not fitted to later machines; the pinion
flange is machined 3 mm deeper. The shim should be
discarded if the later pinion is fitted to earlier machines.
Clean threads of capscrews 8 and apply JCB Threadlocker
and Sealer. Tighten to correct torque.
After replacement, refill the slew housing with the appropriate
grade of oil (see page 3/6-1 for correct procedure).
Slew Cylinder - Replacement
Fit new seals 3 to rack 4. Ensure that plungers A move freely
in their bores without sticking.
Assemble cylinders 2 using new ‘O’ ring 15. Reconnect
hydraulic pipework.
After replacement, refill the slew housing with the appropriate
grade of oil (see page 3/6-1 for correct procedure).
When assembly is complete, operate excavator services fully
to bleed the hydraulic system then check the hydraulic level.
Torque Settings
Item
Nm
kgf m
lbf ft
1
300
30.6
221
5
159
16.2
117
8
395
40.3
291
Section B
9803/8550
Section B
5 - 2
Issue 5*
Kingpost Assembly
*
*
Содержание 1CX
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