Komatsu Galeo BR380JG-1E0 Shop Manual page 290

SEN02303-00
a Measuring condition and method of
judgment: If the output pressures are
in the following range, the PC-EPC
valve is normal.
All work
Engine equipment
switches
Low idle
High idle
5) After finishing measurement, remove the
measuring tools and return the removed
parts.
Adjusting
Adjusting pump PC valve
a If either of the following phenomena occurs
and the PC valve seems to be defective, adjust
PC valves (6) and (7) according to the proce-
dure shown below.
As the working load increases, the engine
q
speed lowers remarkably.
The engine speed is normal but the work
q
equipment speed is low.
(6): Front pump PC valve
q
(7): Rear pump PC valve
q
32
Output pressure
Approx. 2.9 MPa
{Approx. 30 kg/cm
OFF
0 MPa
{0 kg/cm 2 }
1. Loosen locknut (8).
a Before
counter mark at the adjustment screw end
so that you can see the position of the
locknut before the adjustment (and you
can return the locknut to its original posi-
tion after turning it in reverse).
2. Turn adjustment screw (9) clockwise or coun-
2
}
terclockwise to adjust.
a Turn the adjustment screw
Clockwise when the work equipment
q
speed is low (to in crease pu mp
absorption torque) and
Counterclockwise when the engine
q
speed lowers (to decrease pump
absorption torque).
3. Tighten locknut (8).
3
Locknut:
4. After finishing adjustment, check again that the
PC valve output pressure (servo piston inlet
pressure) is normal according to the above
described measurement procedure.
30 Testing and adjusting
loosening the locknut,
27.5 – 34.3 Nm {2.8 – 3.5 kgm}
BR380JG-1E0
make