jcb 1CX, Service Manual

Page: 137 / 242

11 - 4
Start-Up Procedure
The following start-up procedure should always be followed
when starting up a new installation or when restarting an
installation in which either a pump or motor has been
removed from the system.
Note: If a new or rebuilt pump is being fitted always refill the
pump with filtered oil prior to start up. Use the correct oil
(see page 3/1 - 1).
! !
WARNING
The following procedure requires the machine to be
disabled (wheels raised off the ground, work function
disconnected etc.) while the work is carried out.
HYD 8-1/1
Place the machine safely onto blocks, so that all four wheels
are clear of the ground. Ensure that the machine is stable.
! !
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
! !
WARNING
Hydraulic Fluid
Fine jets of hydraulic fluid at high pressure can penetrate
the skin. Do not use your fingers to check for hydraulic
fluid leaks. Do not put your face close to suspected
leaks. Hold a piece of cardboard close to suspected
leaks and then inspect the cardboard for signs of
hydraulic fluid. If hydraulic fluid penetrates your skin, get
medical help immediately.
INT-3-1-10/1
Fill the hydraulic tank with the correct fluid (see page 3/1 -
1), via a 10 micron filter (no by-pass).
Check that the pump inlet line from the hydraulic filter to the
pump unit is filled with fluid, by 'cracking' the hose
connection at the rear main pump.
Install a 0 - 35 bar (0 - 500 lb/in
2
, 0 - 35 kg/cm
2
) pressure
gauge in the charge pressure gauge port A, to monitor the
charge pressure. After machine serial no. 751012 a test
point is provided which, up to serial no. 751715, is
positioned under the pump as shown at B. From serial no.
751716 this test point is positioned at the rear of the left
hand side of the engine as shown at C.
Remove the ESOS fuse to prevent the engine from starting.
With the Drive Control Lever (in the cab) at Neutral, 'jog' the
engine using the starter. The pressure gauge should show a
small rise in pressure as the engine turns. If so, replace the
ESOS fuse and operate the starter whilst slowly increasing
the throttle lever setting until the engine starts and runs at
the lowest possible speed.
As air leaves the system, the charge pressure (as indicated
on the gauge) should rise to a minimum of 7 bar (100 lb/in
2
).
If the charge pressure is incorrect, shut-down and determine
the cause.
Once the correct charge pressure has been established,
operate the drive system 10 times in all directions with the
engine at idle then slowly increase the engine speed whilst
continuing to operate the system. Finally operate the system
in all directions several times with the engine running at
maximum speed.
Shut down engine and remove the pressure gauge. Check
the system fluid level and top up as necessary.
Section E Hydraulics
9803/8550
Section E
11 - 4
Issue 3*
Pumps
*
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