Steering knuckle, left 458/20404 JCB 3CX/4CX, aftermarket

Steering knuckle, left 458/20404 is an aftermarket part for the JCB 3CX and 4CX backhoe loaders. This part is for the left-hand side.

The steering knuckle at the end of a steered axle carries the wheel hub and planetary gearbox and pivots on kingpins or trunnions. It has the arm to which the track rod and steering cylinder attach, passing the steering movement to the wheel. Heavy loads and impacts can wear the trunnion bearing seats, track rod bores and seal faces, and a severe impact can crack or bend the knuckle. A damaged knuckle causes steering play, tyre wear and oil leaks.

Specifications

Compatibility

According to sources, the product card gives 448/42602 and 448/42601 together with 458/20404; 448/42602 is the left-hand steering knuckle of the JCB 3CX backhoe loader. The catalogue also has the genuine version of this part. Other parts are in Reduction gears.

Fitting

For the change, remove the wheel, planetary gearbox and axle shaft and drain the axle oil. Fit the knuckle with its trunnion bearings and shims, tighten the trunnion bolts to torque and set the preload by measurement. Connect the track rod and steering cylinder, renew the seals, top up the axle oil and check the wheel alignment. The knuckle comes new; its seats and bores are cleaned and checked before assembly.