4 - 3
Pressure Measurement
Measurement
Part Name
bar (lb/in
2
)
Method
Port
Main Relief
279 - 284 bar (4046 - 4119 lb/in
2
)
Dipper Relief
G1(G2)
Boom Port Relief
Up
304 - 314 bar (4409 - 4554 lb/in
2
)
Boom Up Relief
G2
Down
255 - 265 bar (3698 - 3843 lb/in
2
)
Boom down Relief
G2
Bucket Port Relief
Out/In
304 - 314 bar (4409 - 4554 lb/in
2
)
Bucket Relief
G2
Dipper Port Relief
Out/In
304 - 314 bar (4409 - 4554 lb/in
2
)
Dipper Relief
G1
Swing Port Relief
Left/Right
201 - 209 bar (2915 - 3031 lb/in
2
)
Swing Relief
G1
Blade Main Relief
221- 231 bar (3205 - 3350 lb/in
2
)
Blade Up
G4
Blade Port Relief
Up/Down
250 - 260 bar (3626 - 3771 lb/in
2
)
Blade Relief
G4
Pilot Relief
34 - 44 bar (493 - 638 lb/in
2
)
Lever Neutral
G3
Accumulator
15 ± 5 bar (217 ± 72.5 lb/in
2
)
G3
Section E
Hydraulics
9803/6020
Section E
4 - 3
Issue 1
Pressure Testing
Pressure Testing - General
Confirmation of the oil Temperature
Confirm the oil temperature is between 45° - 55° C using a
thermometer. If the temperature is low use the following
warm-up procedure.
Warming-up Procedure
1
Turn the
Throttle Control
to mid-range and make sure the
Work Mode Selection Switch
is set to
S
.
2
Press the
One Touch Idle Switch
.
3
Run the engine until the
Coolant Temperature
gauge
reads within the normal (green) range.
4
Set the
Servo Isolator Switch
to ON to enable the
hydraulic servo controls to be operated.
5
Operate the bucket control slowly until it reaches one end
of its travel and leave it there for 30 seconds.
6
Operate the bucket control slowly to the other end of its
travel and leave it there for 30 seconds.
7
Repeat steps 5 and 6 for 10 minutes to warm up the
hydraulic circuit.
8
Now operate the excavating controls three to five times in
each direction to distribute warm hydraulic oil around the
system.
Summary of Contents for JS70
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Page 189: ...Section E Section E Hydraulics 9803 6020 Issue 1 33 4 33 4 Control Valves Control Valve 291360...
