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30 Testing and adjusting
Hydraulic system
Testing oil pressure of control circuit
a Testing tools
Sym-
Part No.
bol
799-101-5002 Hydraulic tester
1
790-261-1205 Digital hydraulic tester
M
799-101-5520 Nipple (10 x 1.25 mm)
2
07002 11023 O-ring
Place the machine on a level ground, lower
the work equipment to the ground, and
release the remaining pressure in the
hydraulic circuit. For details, see "Releasing
remaining pressure in hydraulic circuit".
a Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55°C
Testing
(PC88MR-C010-362-K-00-A)
1. Open the left front inspection window, and
remove pressure pickup plug (1).
2. Install nipple M2 and connect it to oil pressure
gauge [1] of hydraulic tester M1.
a Use the oil pressure gauge of 5.9 MPa {60
kg/cm
2
}.
3. Start the engine, set the working mode to power
mode (P), and turn the auto deceleration OFF.
4. Run the engine at high idle, set all of control
levers and pedals of work equipment, swing,
and travel in neutral, and measure the oil
pressure.
30-48
Part name
(PC88MR-C010-360-K-00-A)
a After finishing the test, remove the testing
tools, and restore the machine.
5. After finishing the test, remove the testing tools,
and restore the machine.
a The control circuit pressure can be checked
at oil pressure pickup plug (2) on the pump
side.
PC88MR-10
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