Mack M359, Manual

Page: 276 / 332

MAINTENANCE, LUBRICATION AND SERVICE
DRIVE BELT ROUTING
mark (the shiny area on the pulley where
the belt rides). The witness mark should
be approximately the same width of the
belt.
1 Acceptable (Witness Mark Approximately
Same Width as Belt)
2 Not Acceptable (Witness Mark Tracking Off
Edge of Pulley)
Remove the belt by using a 1/2 inch
breaker bar to pull the tensioner back to
the install stop. Slowly return the
tensioner to the free-arm stop.
With the belt removed, use the breaker
bar to slowly pull the tensioner from the
free-arm stop to the install stop and then
slowly releasing it back to the free-arm
stop. Any excessive roughness or
hesitancy noticed while performing this
check indicates that the tensioner must
be replaced.
Check for metal-to-metal contact as
follows:
Check for contact between the arm and
the spring case. Replace if metal-to-
metal contact is seen.
1 Free-Arm Stop Position
2 Contact between Arm and Spring Case
Check.
Check for metal-to-metal contact
between the arm and the end cap.
Replace if contact is seen.
1 Contact between Arm and End Cap Check
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