The 300 TDI engine
uses a 'serpentine' type drive belt, which drives all the
ancilliaries except for the air conditioning compressor.
An automatic belt
tensioner keeps the belt at the correct tension, thereby eliminating
the need to manually check the belt tension.
The belt and all
pulleys should be examined regularly for any damage, deterioration or
fouling with mud, grit or chaff etc.
Under normal use
the belt should be changed every 1,200 hrs or every 2yrs but in
adverse conditions it may need changing at 600hrs or less.
checking or adjusting any drive belt, turn off the battery isolator
switch to prevent the engine from being started
Replacing drive belt
1. Disconnect both
hydraulic and fan drive shafts.
2. Fit a 15mm ring
spanner on to the tensioning pulley centre bolt (A above right) and
turn anti-clockwise to release tension.
3. Remove belt and
release tension gently.
4. Check all
pulley grooves for wear and cleanliness.
5. Turn tensioner
anti-clockwise again and fit new belt.
6. Re-fit drive
shafts (see notes on page 32)
conditioning compressor belt
To tension the
belt correctly an accurate torque wrench will be required.
Slacken the 3
bolts (1) securing the tensioner
Apply a clockwise
torque of 35Nm to the square drive (2) of the tensioner and tighten
the bolts to 25Nm