Fiat Kobelco EX355 Tier2, Technical Manual

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EX355 T4-4-7
EXCAVATOR TEST
SWING MOTOR LEAKAGE
Summary:
Check for upperstructure drift while suspending a load
on a slope.
Preparation:
1. Check the lubrication of the swing gear and swing
bearing.
2. Park the machine on a smooth slope with a gradient
of 26.8 % (15°).
3. Load bucket fully. In lieu of loading the bucket,
weight (W: tons) of the following specification can
be used.
W = M x 1.5
where: M = Bucket heaped capacity (m
3
)
1.5 = Soil specific gravity
4. With the arm rolled out, and bucket rolled in,
position the arm top pin height to be level with the
boom foot pin.
5. Swing the upperstructure to position it 90° to the
slope. Make aligning marks on the swing bearing
periphery and track frame using tape, as illus-
trated.
6. Maintain the hydraulic oil temperature at 50 ± 5 °C
(122 ± 9 °F).
Measurement:
1. Select the following switch position:
E Mode HP Mode Work Auto-
Switch Switch Mode Idle
Switch Switch
OFF OFF General OFF
Purpose
Mode
2. Maintain the engine at slow idle. After five minutes,
measure the difference between the marks along
the swing bearing periphery and the track frame.
3. Perform the measurement in both right and left
swing directions.
4. Perform the measurement three times in each
direction and calculate the average values.
Evaluation:
Refer to the Performance Standard Table in Group
T4-2.
SM0147
Measure difference between marks
Marking on the Track Frame
Marking on the Swing Bearing
SM0148