Komatsu WA250-6 Shop Manual

SEN03837-01
30-120 36 WA250, 250PZ-6
120 Testing and adjusting, Part 2
Testing and adjusting bucket positioner
Testing and adjusting bucket
positioner
1
a Measuring condition
q Engine coolant temperature: White range
of engine coolant thermometer
q Hydraulic oil temperature: 45 – 55°C
Testing
1. Stop the engine and check that clearance (a)
between proximity switch (1) and detection bar
(2) is in the standard range.
a Standard clearance (a): 3 – 5 mm
2. Run the engine at same as usual working
speed and check the operating point. (Mea-
sure 3 times and obtain the average.)
Adjusting
1. Adjusting clearance.
1) Adjust and secure clearance (b) between
the tip of switch protector (3) and the sen-
sitive surface of the switch to the standard
range with switch nuts (4).
a Standard clearance (b): 0.5 – 1.0 mm
3 Mounting nut:
14.7 – 19.6 Nm {1.5 – 2.0 kgm}
2) Adjust and secure clearance (a) between
the sensitive surface of proximity switch
(1) and detection bar (2) to the standard
range with the shim and mounting bolt of
the proximity switch bracket.
a Standard clearance (a): 3 – 5 mm
a Adjust detection bar (2) with the shim
so that clearance (a) will be in the
standard range through the stroke of
the detection bar (2).
2. Adjusting installing position (stopping
position).
1) Lower the bucket to the ground and set it
to a desired digging angle, then return the
lever to the holding position and stop the
engine.
2) Adjust with switch mounting nut (4) so that
clearance (b) of the detection bar (2) of
proximity switch (1) is within the standard
value, then secure in position.
3 Switch mounting nut:
14.7 – 19.6 Nm {1.5 – 2.0 kgm}
q The installing position may be
checked by checking the operation of
the pilot lamp of the proximity switch
with the starting switch at the ON
position.
a For ON/OFF of the pilot lamp, see
“Checking proximity switch working
pilot lamp”.
a After adjusting, start the engine and oper-
ate the work equipment control lever to
check that the bucket positioner operates
at the desired position.

Komatsu WA250-6 Specifications

General

Brand	Komatsu
Model	WA250-6
Category	Compact Loader
Language	English