Fan drive pulley 320/08550 JCB Dieselmax, genuine

Fan drive pulley 320/08550 is a genuine JCB part for the JCB Dieselmax 444 engine. The card also lists 320/A8514.

The fan drive is a bearing housing and flange, turned by the belt and carrying the cooling fan. When the bearing wears, the unit hums, the fan wobbles and the blades can strike the cowl. A seized bearing can break the belt and overheat the engine. The fan drive is part of the belt drive: its pulley is turned from the crank pulley by the belt. Fan speed follows engine speed, and the unit's bearing carries both the belt tension and the weight of the fan. Imbalance on the fan side shortens bearing life, so a fan with a broken blade must be replaced at once. The unit housing bolts to the front of the engine. The bearing is a sealed type.

Specifications

Compatibility

The part is listed for JCB 3CX and 4CX backhoe loaders. The catalogue also has the aftermarket version of this part. Other parts are in JCB Dieselmax engine.

Fitting

The gap between fan and cowl must be even all round. Check the alignment of all pulleys before fitting the belt. Recheck the belt tension after a few hours of work.