Fiat Kobelco EX355 Tier2, Technical Manual

Page: 202 / 968

EX355 T4-4-3
EXCAVATOR TEST
MISTRACK CHECK
Summary:
1. Allow the machine to travel 20 m (65.5 ft). Measure
the maximum tread deviation from the tread chord
line drawn between the travel start and end points
to check the performance equilibrium between both
sides of the travel device systems (from the main
pump to the travel motor).
2. If measured on a concrete surface, the tread
deviation has a trend to decrease.
Preparation:
1. Adjust the track sag of both tracks to be equal.
2. Provide a flat, solid test yard 20 m (65.5 ft) in
length, with extra length of 3 to 5 m (9.8 to 16 ft) on
both ends for machine acceleration and decelera-
tion.
3. Hold the bucket 0.3 to 0.5 m (12 to 20 in) above the
ground with the arm and bucket rolled in.
4. Maintain the hydraulic oil temperature at 50 ± 5 °C
(122 ± 9 °F).
Measurement:
1. Measure the amount of mistracking in both fast,
and slow travel speeds.
2. Select the following switch positions:
Travel Engine E Mode HP Mode Work Auto-Idle
Mode Control Switch Switch Mode Switch
Switch Dial Switch
Slow Fast OFF OFF General OFF
Mode Idle Purpose
Mode
Fast Fast OFF OFF General OFF
Mode Idle Purpose
Mode
3. Start traveling the machine in the acceleration
zone with the travel levers at full stroke.
4. Measure the maximum distance between a
straight 20 m (65.5 ft) tread chord line and the tread
made by the machine.
5. After measuring the tracking in forward travel, turn
the upperstructure 180° and measure in reverse
travel.
6. Repeat steps 3. to 5. three times and calculate the
average values.
Evaluation:
Refer to the Performance Standard Table in Group
T4-2.
SM0140
Maximum Distance
Acceleration
Zone:
3 to 5 m
20 m