Komatsu PC200-8M0, Shop Manual

Page: 389 / 1254

SEN06127-00
PC200, 200LC, 220, 220LC-8M0 30-101
37
101 Testing and adjusting, Part 1
Testing control circuit source pressure
Testing control circuit source
pressure
1
a
Measuring tools for control circuit basic pres-
sure
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.
q
Hydraulic oil temperature: Within operating
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
2
}.
3. Start the engine, set the working mode in the
power mode (P), and turn the auto-decelerator
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.
Symbol Part No. Part name
K
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2
799-101-5220 Nipple (10 × 1.25 mm)
07002-11023 O-ring