Testing Control Circuit Source Pressure - Komatsu PC200-8M0 Shop Manual

101 Testing and adjusting, Part 1

Testing control circuit source pressure

Testing control circuit source
pressure
a Measuring tools for control circuit basic pres-
sure
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 remaining pressure from
the hydraulic circuit. For details, see
" R e l e a s i n g r e m a i n i n g p r e s s u r e f r o m
hydraulic circuit".
a Measure the control circuit source pressure
under the following condition.
Hydraulic oil temperature: Within operating
q
range
1. Remove the control valve top cover and oil
pressure pickup plug (1).
2. Install nipple K2 and connect oil pressure
gauge [1] of hydraulic tester K1.
a Use the oil pressure gauge with capacity
6 MPa {60 kg/cm
PC200, 200LC, 220, 220LC-8M0
Part name
O-ring
2
}.
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 to the neutral, and measure
the oil pressure.
5. After finishing measurement, remove the mea-
suring tools and return the removed parts.
a The control circuit basic pressure may be mea-
sured with oil pressure pickup plug (2) on the
hydraulic pump side.
a Do not adjust the relief valve for control circuit
source pressure.
SEN06127-00
37
30-101