Komatsu PC130-7, Shop Manual, Page: 53 / 342

PC130-7
20-135
TESTING AND ADJUSTING
MEASURING PPC VALVE
OUTPUT PRESSURE
a
Measuring instruments for PPC valve output
pressure
a
Before measuring the PPC valve output pres-
sure, check that the basic pressure in the control
circuit is normal.
k
Lower the work equipment to the ground and
stop the engine. Operate the control levers
several times to release the residual pressure
in the piping, and then loosen the oil filler cap of
the hydraulic tank slowly to release the internal
pressure of the hydraulic tank.
1. Disconnect PPC oil pressure switches (1) – (4)
of the circuit to be measured.
a
Since PPC oil pressure switches (1) – (8) are
installed in the battery room, open the bat-
tery room cover.
a
Since PPC oil pressure switch (9) is installed
on the under side of the floor frame, remove
the cab undercover (on the front side).
a
Since PPC oil pressure switches (10) and
(11) are installed in the battery room, open
the battery room cover.
2. Install nipple [1] of hydraulic tester N and con-
nect it to oil pressure gauge [2].
a
Use the oil pressure gauges of 5.9 MPa {60
kg/cm
2
}.
a
The figure shows the measuring instruments
installed to the mounting part of the swing
LEFT PPC pressure switch.
3. Run the engine and heighten the hydraulic oil
temperature to 45 – 55°C.
Symbol Part No. Part name
N
799-101-5002 Hydraulic tester
790-261-1203 Digital hydraulic tester
No. Circuit to be measured No. Circuit to be measured
1 Boom RAISE (S06) 7 Swing RIGHT (S07)
2 Boom LOWER (S02) 8 Swing LEFT (S03)
3 Arm IN (S04) 9 Travel (S30)
4 Arm OUT (S04) 10
1ATT on front side
(S10)
5 Bucket CURL (S08) 11
1ATT on rear side
(S11)
6 Bucket DUMP (S01)
MEASURING PPC VALVE OUTPUT PRESSURE
(1)