Section E - Hydraulics
Transmission Pumps
Start-Up Procedure
E - 74 E - 74
9803-9450-2
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
fluid see Fluids, Lubricants and Capacities.
!MWARNING
The start-up procedure requires the machine to be
disabled (wheels raised off the ground, work function
disconnected, etc.) while the procedure is carried out.
HYD-8-1
Place the machine safely onto blocks, so that all four
wheels are clear of the ground. Ensure that the machine is
stable.
!MWARNING
It is not possible to vent all residual pressure. Loosen
the connection one full turn and allow the pressure to
dissipate. Keep face and hands well clear of
pressurised hydraulic oil and wear protective glasses.
HYD-4-3
!MWARNING
Fluid Under Pressure
Fine jets of fluid at high pressure can penetrate the
skin. Keep face and hands well clear of fluid under
pressure and wear protective glasses. Hold a piece of
cardboard close to suspected leaks and then inspect
the cardboard for signs of fluid. If fluid penetrates your
skin, get medical help immediately.
INT-3-1-10_2
Fill the hydraulic tank with the correct fluid (see Fluids,
Lubricants and Capacities) 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 slackening the hose
connection at the loader pump.
Bleed air from the pump casing by slackening hose
connection at C K
Fig 64. ( T E-74) until oil flows freely,
then retighten the connections.
Install a 0 - 40 bar (0 - 600 lbf/in
2
, 0 - 42 kgf/cm
2
) pressure
gauge in the pressure test point at the hydraulic filter.
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 14 bar
(203 lbf/in
2
, 14.3 kgf/cm
2
). If charge pressure is not
registered on the gauge, shut-down and determine the
cause.
Once 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.
Check the charge pressure at maximum engine speed
which should be as specified K
General Data ( T E-1).
Stop the engine and remove the gauge. Check the system
for leaks and top up the fluid as necessary.
Fig 64.
C
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