4 - 2
Pressure Measurement Measurement
Part Name bar (lb/in
2
) Method Port
Main Relief Standard: 314 - 320 bar (4554 - 4641 lb/in
2
) Dipper Relief G1(G2)
Power Boost: 343 - 350 bar (4975 - 5076 lb/in
2
)
Boom Port Relief Raise 358 - 365 bar (5192 - 5294 lb/in
2
) Boom Up Relief G2
Lower 295 - 305 bar (4278 - 4423 lb/in
2
) Boom down Relief G2
Bucket Port Relief Open/Close 358 - 365 bar (5192 - 5294 lb/in
2
) Bucket Relief G2
Dipper Port Relief Out/In 358 - 365 bar (5192 - 5294 lb/in
2
) Dipper Relief G1
Swing Port Relief Left/Right 275 - 285 bar (3988 - 4133 lb/in
2
) Swing Relief G1
Pilot Relief 37 - 43 bar (536 - 624 lb/in
2
) Lever Neutral G3
Accumulator 15 ± 5 bar (217 ± 72.5 lb/in
2
)G3
Track Motor Relief 338 - 348 bar (4902 - 5047 lb/in
2
) G1(G2)
Section E Hydraulics
9803/6410
Section E
4 - 2
Issue 1
Pressure Testing
Pressure Testing - General
Confirmation of the oil Temperature
Confirm the oil temperature is between 45° - 55° C using the
self check function. 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.
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