Crown wheel and pinion 458/70023 JCB Loadall, aftermarket

Crown wheel and pinion 458/70023 is an aftermarket part for the JCB Loadall telehandlers. The set's ratio is 8/35.

Crown wheel and pinion sets differ in ratio, spiral direction (right or left hand), pinion thread and mounting dimensions, so two similar-looking sets may not fit the same axle. The set is therefore chosen by part number and the tooth counts on the old set. On four-wheel-drive machines the front and rear axle ratios must match each other, since different ratios strain the driveline and wear the tyres.

Specifications

Compatibility

According to sources, 458/70023 is the 8/35 crown wheel and pinion used on JCB machines. Other parts are in Reduction gears.

Fitting

Fitting a crown wheel and pinion is precise work needing measuring tools and should be done by an experienced workshop. Pinion depth is set with shims and backlash with the differential bearing adjustment, then the tooth contact pattern is checked with marking compound. Pinion bearing preload and pinion nut torque are set to the service manual. After assembly, fill the axle with the specified oil and check for whine and heat during the first hours.