Measuring Ppc Valve Output Pressure - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING
MEASURING PPC VALVE
OUTPUT PRESSURE
a Measuring instruments for PPC valve output
pressure
Symbol Part No.
799-101-5002
N
790-261-1203
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.
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.
No. Circuit to be measured No. Circuit to be measured
1 Boom RAISE (S06)
2 Boom LOWER (S02)
3 Arm IN (S04)
4 Arm OUT (S04)
5 Bucket CURL (S08)
6 Bucket DUMP (S01)
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).
PC130-7
Part name
Hydraulic tester
Digital hydraulic tester
Operate the control levers
7 Swing RIGHT (S07)
8 Swing LEFT (S03)
9 Travel (S30)
1ATT on front side
10
(S10)
1ATT on rear side
11
(S11)

MEASURING PPC VALVE OUTPUT PRESSURE

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
2
kg/cm }.
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.
20-135
(1)