Johnston VM502, Руководство по обслуживанию

Страница: 210 / 220

V Range 502
l
652
l
802 Maintenance Manual
MA9:6
Chapter - Service Tools
Pump Set Up continued:
1. With the vehicle jacked-up and secured on axle stands and both front wheels fully chocked
- engage the
HydroDrive and select the 1:1 ratio.
2. Release the clutch and increase the engine rpm to the maximum 1700. Keep handbrake
applied, select forward using the drive select control, depress the accelerator pedal and read
the pressure from test point
T3 .
3. Then select reverse and read the pressure from test point T1 .
Note : The forward and reverse relief valves are located adjacent to the filter on the transmission
pump. The top valve is for reverse (350 bar) and the lower for forward (420 bar). Adjustments are
made by turning the valves clockwise to increase the pressure and counterclockwise to reduce it.
Pump - Control System Checks
The pump is equipped with an electronically controlled proportional control valve which acts to
convert an electrical current (mA) input into a hydraulic servo control pressure. In order to check that
this function is operating correctly, a pressure signal of 8-18 bar should be recorded at test point
T2
with accelerator pedal fully relaxed or fully depressed.
ANTI SKID MODULE SET-UP
1. Fit a 400 bar minimum pressure gauge on test point H-15Z6 adjacent to the valve on the anti
skid block.
2. Disconnect and remove the electrical coil from the cartridge valve.
3. With HydroDrive engaged, select reverse using the joystick, (the chassis gearbox in 1:1
drive and the parking brake applied, depress the accelerator pedal to its maximum position
and read the pressure on the gauge. Adjust the relief valve
CT2 on the antiskid module as
required to achieve a nominal 200 bar setting.