4
40 User’s Handbook, TSL 4186E, Issue 2
4012/16 Diesel
How to check and adjust the radiator fan drive belts (if fitted)
1 Remove the mesh guard from around the fan belts.
2 Grease the fan bearings and jockey pulley bearings.
3 Check the tension and wear of the fan belts using hand pressure midway between the crankshaft and the
pulley. A total deflection of 12,5 mm (0.5”) is satisfactory (A1).
Note: If the fan belts are worn the complete set should be replaced and the fan pulley to crankshaft pulley
alignment checked.
4 If adjustment is necessary slacken the adjusting screws (A2). Using a tube extension (A3) on the jockey
pulley move outwards to tension the belts and inwards to slacken.
5 With the tension set, tighten the adjusting screws (A2).
6 Refit the mesh guard.
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