
Maintenance
SY16C Excavator OMM
5-22
Operation and Maintenance Manual — 0420
SANY
4. Adjust the engine belt if it is outside of specification.
Loosen the adjusting plate fastener (5) and alternator
bracket fastener (6).
5. Use a lever between the alternator and adjusting plate
bracket to properly tension the belt. Hold the alternator
in this position and tighten the adjusting plate fastener.
6. Tighten the alternator bracket fastener.
7. Check the engine belt tension to confirm adjustment.
Inspect/Replace the Engine Belt
Inspect the Engine Belt
Visually inspect the condition of the engine belt. An engine belt that has been exposed to oil or engine coolant, or
shows signs of damage or wear, must be replaced.
•
Abrasion: The belt appears shiny or glazed, or fabric is exposed. This is a sign that the engine belt is in
contact with an object, such as a flange or fastener.
•
De-lamination: Chunks of rubber material have broken from the engine belt. At this stage, the engine belt
can fail at any moment. Heat, age, and stress are the primary contributors.
•
Pulling: Belt material is sheared from the ribs. Lack of tension, misalignment, worn pulleys, or a
combination of these factors can cause the following:
•
Uneven rib wear: The engine 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: An engine 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 engine 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 engine 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. 5-7
0005158
5
6
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