12
118 Workshop Manual, TSD3450E, Issue 1
2800
Fan drive belts
To check and to adjust the tension Operation 12-7
1 Remove the fan guards.
2 Use a Borroughs belt tension gauge to check the tension at the position shown (A1). It should be 800 N,
which is equivalent to 4,0 mm of movement when a force of 33 N is applied. To adjust the tension, proceed as
follows:
3 Loosen the lock nuts on the adjustment bolt, loosen the large lock nut on the belt tensioner and turn the
adjustment bolt (A2) until the correct tension is obtained. Tighten the lock nuts and check the tension of the
belts again.
4 Fit the fan guards and run the engine for 15 minutes. Remove the guards and check again the tension.
5 For new fan belts, set the tension to 868 N, which is equivalent to 4,0 mm of movement when a force of
35,7 N is applied. After the engine has been run for 15 minutes, check the tension and adjust it to 800 N;
equivalent to 4,0 mm of movement when a force of 33 N is applied.
6 When the correct tension is obtained, fit the fan guards
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