jcb 1CX, Service Manual

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Slew Cylinder
Re-seal
Position machine on firm level ground. Slew the excavator
fully round so that the cylinder to be worked on is facing
rearwards. Fit the boom lock and stop the engine. Operate
slew control levers to vent residual hydraulic pressure.
! !
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
Oil will run out of the slew housing when the cylinder is
removed. Position a container underneath to catch the oil.
Disconnect hydraulic feed pipe 1 from cylinder. Unscrew
capscrews 2 and remove cylinder 3.
Remove seals 4 from rack. Check that seal grooves are
clean and free from burrs.
Check end damping plunger 5 which should move freely in
its bore and be returned by the force of spring 6.
Lubricate new seals 4 with clean engine oil and fit to rack.
Renew 'O' ring 7.
Re-assemble components in reverse order. Tighten
capscrews 2 to 300 Nm (221 lbf ft, 31 kgf m).
Repeat for other slew cylinder if required then fill the slew
housing with oil (see opposite).
Section E Hydraulics
9803/8550
Section E
Issue 1
Rams 23 - 1
Filling Procedure
Whenever the slew housing is re-filled with oil the following
procedure must be carried out to ensure that all air is
expelled:
1 Remove plug A and fill with clean oil to the level of the
plug. Replace the plug.
2 Remove plug B and half fill the breather tube C with
clean oil.
3 Start the engine and operate the slew service until the
oil level rises in the breather tube. Stop the engine.
4 Remove plug A to release the air then replace the plug.
Top up the oil level in the breather tube.
5 Repeat the operation until all air is expelled.
6 Check that the oil level is up to the mark in the breather
tube and replace plug B.
23 - 1
S215900
203940
B
C
A
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