Komatsu Galeo PC800-8 Shop Manual page 363

30 Testing and adjusting
4. Measuring jet sensor output differential pressure
When measuring output differential pressure
with machine monitor
a The jet sensor output differential pressure
can be checked with the monitoring function
of the machine monitor, too.
(For the operating method, see "Special
functions of machine monitor".)
• Monitoring code:
13800 (L-jet sensor differential pressure)
13801 (R-jet sensor differential pressure)
a For the measurement conditions, see 3), 4),
and 5).
When removing oil pressure pickup plugs
from machine and measuring output differ-
ential pressure
1) Remove clamping bolts (3) and (4) of the
differential pressure sensor wiring harness
and remove oil pressure pickup plugs (5)
and (6) under the left 5-spool control valve
and oil pressure pickup plugs (7) and (8)
under the right 4-spool control valve.
• (5): High pressure side (NCAI) of left 5-
spool control valve (F pump)
• (6): Low pressure side (NCBI) of left 5-
spool control valve (F pump)
• (7): High pressure side (NCA) of right 4-
spool control valve (R pump)
• (6): Low pressure side (NCB) of right 4-
spool control valve (R pump)
PC800, 850-8
2) Install measuring hose [2] of hydraulic tester
M1 and connect it to differential pressure
gauge M2 or oil pressure gauge [1].
a When using differential pressure gauge:
Connect the high pressure (5) or (7) to
the high pressure side (back side) of the
differential pressure gauge and connect
the low pressure (6) or (8) to the low
pressure side (lower side). Since the dif-
ferential pressure gauge needs DC 12
V, connect 1 battery to it.
a When using pressure gauge:
Connect the pressure gauge of 6.0 MPa
{60 kg/cm } to the high pressure side
2
(Pt) and connect the pressure gauge of
2.5 MPa {25 kg/cm
side (Pd).
3) Start the engine and set the working mode
switch in the P-mode position.
4) Set all the control levers in neutral and
measure the jet sensor output differential
pressure under the following condition.
i) Set all the control levers in neutral.
ii) Run the engine at high idle and measure
the output differential pressure.
a Jet sensor output differential pressure =
High pressure (NCA) – Low pressure (NCB)
SEN00788-02
} to the low pressure
2
15