SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 98
The coolant pump and alternator are driven by the belt drive,
as also is the A/C compressor.
(The fan is mounted on a special bracket and is driven by
the hydraulic system. See in chapter 5 Hydraulic system)
The drive belt is a “Multigroove V-belt”, i.e. the belt has numer-
ous V-shaped grooves on the drive side. The pulleys are of
corresponding design and the belt therefore has an extremely
large contact surface for its width. A large contact surface re-
duces the risk of belt slippage.
Included in the belt circuit are also jockey pulleys, the purpose
of which is to give the belt a good arc of contact round the pul-
leys.
An automatic belt tensioner is used to obtain the correct belt
tension.
Belt drive collant pump, generator and AC com-
pressor
1 Spacing sleeve
2 Roller
5 Roller
7 Belt tensioner
9 Poly V belt
10 Alternator
11 Coolant pump
12 A/C compressor
13 Pulley
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