14 - 11
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, work function
disconnected etc.) while the work is carried out.
HYD 8-1/1
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 seat and floorplate to access the hose
connections A and B.
3 Insert a tee piece and 0 - 40 bar (0 - 600 lb/in
2
, 0 - 42
kg/cm
2
) pressure gauge as shown at X into the supply
hose at the pressure reducing solenoid valve at position
A.
4 Start the engine and observe the gauge reading which
should show the main pump charge pressure (see
Hydraulics Technical Data).
Section E
Hydraulics
9803/8500
Section E
14 - 11
Issue 1
Problem Solving
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 C.
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, at positions B.
8 Start the engine and move the joystick lever to pressurise
the relevant hose. The lever should be moved in the
direction of the appropriate hose.
9 Compare the pressure gauge readings with the figures
shown in Hydraulics Technical Data - Joystick Output
Characteristics.
10 If any readings are not correct, check the hoses for
blockage. If the hoses are clear the joystick should be
dismantled for repair.
X
BB
BB
BB
BB
AA
CC
325380
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