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SY135C Excavator OMM
Maintenance
SANY
Operation and Maintenance Manual — 0120
5-39
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INTRODUCTION
SAFE
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CONTROLS
MACHINE
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INTENANCE
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EQUI
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Inspect Engine Serpentine Belt
1. Prepare the machine for service. See “Maintenance
2. Open the engine compartment cover. See “Engine
Compartment Cover” on page 3-8.
3. Inspect the engine serpentine belt (1) for the following:
•
Abrasion: The belt appears shiny or glazed, or fabric
is exposed. This is a sign that the belt is in contact
with an object, such as a flange or fastener.
•
Chunk-out: Chunks of rubber material have broken
from the belt. At this stage, the belt can fail at any
moment. Heat, age, and stress are the primary
contributors.
•
Pulling: Belt material is sheared off from the ribs.
Lack of tension, misalignment, worn pulleys, or a
combination of these factors can cause the following:
•
Uneven rib wear: The belt shows damage to the side, with the possibility of breaks in the tensile cord or
jagged-edged ribs. A thumping/grinding noise may also be heard when running.
•
Improper installation: A belt rib begins separating from the strands. If left unattended, the cover will often
separate, causing the belt to unravel.
•
Cracking: Small visible cracks appear along the length of a rib or ribs. With continuous exposure to high
temperatures, the stress of bending around the pulleys leads to cracking.
•
Misalignment: The side walls of the belt may appear glazed, or the edge-cord may become frayed. A
noticeable noise may result.
•
Gravel penetration: Small pinholes are visible on the back side of the belt. Bumps may be visible and
fabric around the holes can be frayed, indicating damage from foreign objects, such as dirt, gravel, or
similar debris.
Fig. 5-91
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