7-7
TRAVEL DEVIATION
Measure the deviation by the tracks from
a 20 m straight line.
Preparation
Adjust the tension of both tracks to be
equal.
Provide a flat, solid test yard 20 m in
length, with extra length of 3 to 5 m on
both ends for machine acceleration and
deceleration.
Hold the bucket 0.3 to 0.5 m above the
ground with the arm and bucket rolled in.
Keep the hydraulic oil temperature at
50
Ü
5˚C.
Measurement
Measure the amount of mistracking at
high and low travel speeds.
Before beginning each test, select the
following switch positions.
Power mode switch : P mode
Star t traveling the machine in the
acceleration zone with the travel levers
at full stroke.
Measure the distance between a straight
20 m line and the track made by the
machine. (Dimension a)
After measuring the tracking in forward
travel, turn the upperstructure 180
Á
and
measure that in reverse travel.
Repeat steps
刱
and
刲
three times and
calculate the average values.
Evaluation
0.3~0.5m
5)
(1)
(2)
刮
刯
到
刱
(3)
刮
刯
余
到
刱
刲
刳
Unit : mm / 20 m
Mistrack should be within the following specifications.
3~5 m extra length
3~5 m extra length
20M
a
(4)
300L7MS02
(210-7) 7-7(2)
Model
Standard
Maximum allowable
Remarks
HX430 L
200 below
250
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