Komatsu 75001, Shop Manual

Page: 352 / 1293

SEN03834-01
WA250, 250PZ-6 10-920
21
920 Electrical system, Part 2
ECSS system
Operation
q
The operating condition of ECSS is as follows.
*1. It is allowed to select any travel speed at the
ECSS switching point (B) in the range of 5 to 8
km/h by adjusting the items "Adjustment of
ECSS operation travel speed" with the adjust-
ing function of the machine monitor.
*2. The travel speed available at ECSS switching
point (A) is obtained by deducting 1 km/h from
that available at the switching point (B)
(namely, 4 - 7 km/h).
a
When tilting the bucket or lowering the lift arm,
turn "OFF" the ECSS operation signal to reset
ECSS.
(WA250PZ-6)
a
For the adjustment procedure, see "Special
functions of machine monitor (EMMS)" in Test-
ing and adjusting.
q
The operating condition of PPC oil pressure
switch is as follows.
ECSS switch Travel speed [km/h]
ECSS operation
signal
OFF 0 – Max.
OFF
ON
(*2) Max. 4
(*1) Min. 5 ON
ECSS switching point A B
Travel speed [km/h]
(*2)
4
(*1)
5
PPC oil pressure switch
operating point
A B
Operating oil pressure
[MPa{kg/cm
2
}]
0.29
{3}
0.49
{5}