jcb JS70 Service Manual

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.

jcb JS70 Specifications

General

Brand	jcb
Model	JS70
Category	Excavators
Language	English