12 - 16
Checking the Joystick Hydraulic Lines
If the machine does not respond to joystick movements,
check the hydraulic supply to and from the joystick as
follows:
!!
WARNING
The following procedure requires the machine to be
disabled (wheels raised off the ground, attachment
disconnected etc.) while the work is carried out.
HYD 8-1/2
1 Raise and block the machine so that the wheels are
clear of the ground. Stop the engine. Make sure the
machine is stable.
2 Remove the front floorplate to access the hose
connections.
3 Insert a tee piece and 0 - 40 bar (0 - 600 lb/in
2
, 0 - 42
kg/cm
2
) pressure gauge into the joystick supply hoses at
the brake valve at positions A and B.
4 Start the engine and observe the gauge reading which
should show the transmission pump charge pressure
(see Hydraulics Technical Data). Make sure the brake
valve is selected.
5 If the gauge shows no or little pressure it could indicate
a fault in the charge pressure relief valve in the
hydrostatic pump or the pressure reducing solenoid
valve.
6 If the supply pressure is correct, check the feed hose to
the joystick for blockage.
7 Remove the tee piece and gauge and connect into each
servo feed line in turn, as shown at C.
1 Right hand side forward
2 Left hand side forward
3 Right hand side reverse
4 Left hand side reverse
8 Start the engine and move the joystick lever fully in the
appropriate direction to pressurise the relevant hose.
The joystick positions shown are for single lever
operation.
9 The pressure gauge should show transmission pump
charge pressure with full joystick travel (see Hydraulics
Technical Data).
10 If any readings are not correct, check the hoses for
blockage. If the hoses are clear the joystick should be
dismantled for repair.
Section E Hydraulics
9803/8550
Section E
12 - 16
Issue 2
Pumps
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