Testing Control Circuit Basic Pressure - Komatsu Galeo PC138US-8 Shop Manual

SEN02458-01
Testing control circuit basic
pressure
a Testing tools for control circuit basic pressure
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
K
799-101-5220 Nipple (10 × 1.25 mm)
2
07002-11023
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the residual pressure from
the hydraulic circuit. For details, see
"Releasing residual pressure from hydrau-
lic circuit".
a Test the control circuit basic pressure under
the following condition.
Hydraulic oil temperature: Within operating
q
range
1. Remove the control valve cover and oil pres-
sure pickup plug (1).
2. Install nipple K2 and connect oil pressure
gauge [1] of hydraulic tester K1.
a Use the oil pressure gauge of 5.9 MPa {60
kg/cm 2 }.
30
Part name
O-ring
3. Start the engine, set the working mode in the
power mode (P), and turn the auto-decelerator
1
OFF.
4. Run the engine at high idle, set all the levers
and pedals for work equipment control, swing
control, and travel in neutral, and test the oil
pressure.
5. After finishing test, remove the testing tools
and return the removed parts.
a The control circuit basic pressure may be
tested with oil pressure pickup plug (2) on the
hydraulic pump side.
a Do not adjust the relief valve for control circuit
basic pressure.
30 Testing and adjusting
PC138US, USLC-8