Komatsu PC200-8M0, Shop Manual, Page: 398 / 1254

SEN06127-00
30-101
46
PC200, 200LC, 220, 220LC-8M0
101 Testing and adjusting, Part 1
Testing solenoid valve output pressure
Testing solenoid valve output
pressure
1
a
Measuring tools for solenoid valve output 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
Before measuring the solenoid valve output
pressure, check that the control circuit source
pressure is normal.
a
Measure the solenoid valve output pressure
under the following condition.
q Hydraulic oil temperature: Within operating
range
1. Disconnect outlet hoses (1) – (6) of the sole-
noid valves to be measured.
a
When measuring with hose (1), remove
the undercover (rear side) of the opera-
tor's cab.
a
When measuring with hoses (2) – (6),
remove the undercover of the control
valve.
2. Install adapter N2 and connect the discon-
nected hose again.
3. Fit nipple [1] of hydraulic tester N1 and then
connect it to oil pressure gauge [2].
a
Use the oil pressure gauge of 6 MPa {60 kg/
cm
2
}.
a
The figure shows the measuring tools con-
nected to outlet hose (1) of the PPC lock
solenoid valve.
4. Start the engine.
5. Run the engine at high idle, operate the control
levers and switches to turn the solenoid valve
ON or OFF, and measure the oil pressure.
a
For the conditions for turning the solenoid
valve ON and OFF, see the operation
table of each solenoid valve.
a
The operating condition of the solenoid
valve can be checked with the monitoring
function of the machine monitor (For
details, see “Special functions of machine
monitor”).
q Monitoring code: 02300 Solenoid 1
q Monitoring code: 02301 Solenoid 2
Symbol Part No. Part name
N
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2 799-401-3100 Adapter (Size 02)
No. Solenoid valve to be measured
1 PPC lock solenoid valve
2 2-stage relief solenoid valve
3 Swing holding brake solenoid valve
4 Travel speed selector solenoid valve
5 Travel junction solenoid valve
6
ATT return selector solenoid valve
(Attachment installation specification)