jcb JS 200 Series, Service Manual

Page: 231 / 531

4 - 12
Hydraulic Pump
Proportional Pressure Reduction Valve.
1. Prepare the Machine
a.
Put the operator lever into neutral, lower the gate lock
lever, start the engine and place the machine on level
ground. Lower and open the dipper and set the
bucket on the ground.
b. Stop the engine and release hydraulic pressure.
(See Releasing Tank Pressure ) .
c. Connect a 0-500 bar (0-7000 lb/in
2
) pressure gauge
and adaptor to port a3.
2. Pressure
a. Start the engine and lower the gate lock lever, run
the engine at maximum no-load speed, with the
operator lever in neutral.
b. Refer to the chart below for the pressure reading in
the relevant modes.
No adjustment is possible
Section E
Hydraulics
9803/6400
Section E
4 - 12
Issue 1
Pressure Testing
Engine revolutions Max.
Lever operation Neutral
H 99.5 lb/in
2
-355 lb/in
3
, 6.7 bar - 24.1 bar
(7 - 25 kgf/cm
2
)
S 367 lb/in
2
-455 lb/in
2
, 24.9 bar - 30.9 bar
(26 - 32 kgf/cm
2
)
L.F. _
Pressure gauge 0-500 bar, 0-7000 lb/in
2
(50kgf/cm
2
)
Measurement port a3
Mode
Operation
a3