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MAINTENANCE, LUBRICATION AND SERVICE
DRIVE BELT ROUTING
Drive Belt Installation
To install a poly V-belt, swing the
automatic tensioner to the full sprung
position (fully toward the install stop),
then place the belt over the pulleys.
Slowly return the automatic tensioner
back to its original position. Do not allow
the tensioner to snap against the stops.
Before installing the new belt, ensure
that the pulley grooves are clean and
free of debris.
Drive Belt Routing
Certain model chassis equipped with
MP7
™
engines utilize a 10-rib belt on 12-
rib pulleys. When replacing the belt, the
belt must be installed against the rear
face of the pulley (edge of pulley closest
to the engine).
1
Install 10-rib belt against rear edge of 12-rib
pulley.
Accessory Drive Belt Routing
Accessory drive belt and main belt
routing with and without air conditioning.
This diagram is located in a clear area
on the outside of the left frame between
the radiator and center line of the front
axle.
1
Crankshaft Pulley
2
Automatic Tensioner
3
Idler Pulley
4
Coolant Pump
5
Main Drive Belt
6
Fan Drive
7
Idler Pulley (when applicable)
8
Accessory Drive Belt
9
Automatic Tensioner
10 Alternator
11 Air Conditioner Compressor (if equipped)
Automatic Belt Tensioner
The automatic belt tensioner is designed
to maintain proper belt tension
throughout the life of the tensioner. The
belt tensioner cannot be adjusted or
repaired. At each D inspection interval or
once per year, whichever occurs first,
check the following:
• With the belt on the drive, check the
following:
Check to see if the tensioner is resting
against the install stop or the free-arm
stop. If the tensioner is resting against
either stop, the tensioner must be
replaced.
1
Install Stop
2
Free Arm Stop
On main drive belt tensioners, check
belt tracking. If the belt is tracking all the
way to one side of the tensioner pulley
(either the front- or back-side), replace
the tensioner. Belt tracking can be
determined by looking at the witness
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