SANY SY155U, Operation And Maintenance Manual, Page: 98 / 192

4-30
MACHINE OPERATION
SY155U Excavator OMM
0002906
Figure 4-62
NOTE: The tracks may slip when the machine is traveling
uphill. Use the arm to help the machine travel
uphill as necessary.
• To maintain machine balance on an incline, extend
the boom and arm uphill and keep the bucket

16 in.–20 in. (40 cm–50 cm) (1) off the ground.
Travel at a low speed.
NOTE: When traveling uphill, keep the tracks in the
forward direction.
0002908
Figure 4-63
• When traveling downhill, keep the bucket in the
traveling direction and 16 in.–20 in. (40 cm–50 cm)
(1) above the ground. Lower the bucket immediately
if the machine slips or loses balance.
Engine Stalls on an Incline
Before traveling up a steep incline, allow the machine to
warm to operating temperature.
If the engine stalls when the machine is on an incline,
lower the bucket to the ground immediately, move all
control levers to the neutral position and move the
hydraulic lockout control lever to the unlocked (open)
position, restart the engine.
When the engine stalls on an incline, do not allow the
upper structure to swing.
Operating on Soft Ground
NOTICE!
• Rugged terrain could cause wide tracks with
wide shoes to bend or come loose and damage
other track components.
• Wide track hoes are intended for operation on
soft ground.
• Inspect the track shoe fasteners on a regular
basis.
Choose the proper tracks when operating the machine
on soft ground. Soft ground could cave in and cause the
machine to roll over. Place steel plates on soft ground to
support the machine.
The machine may get stuck when operating on soft
ground. If the machine gets stuck. See “Removing a
Stuck Machine” on page 4-30.
Removing a Stuck Machine
Be careful when operating on soft terrain and avoid
becoming stuck. If the machine becomes stuck in the
mud, perform the following procedures to free the
machine:
WARNING
Use caution when placing cribbing under the
track, since the machine is supported only by the
boom and could drop without warning causing
injury or death.
One Track Stuck
1. Position the boom and arm at an angle between 90°
and 110°.
2. Pivot the upper structure to position the boom over
the track that is stuck.
3. Curl the bucket so that the back of the bucket
touches the ground.
4. Lower the boom to raise the track.
5. Place cribbing under the track to provide a firm
surface as necessary.
6. Raise the boom to lower the track onto the cribbing.
7. Drive the machine out of the mud.
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