Crown wheel and pinion 458/70246 JCB 3CX/4CX, OEM

458/70246

Brand
HEMA
Article
458/70246
Machine system
Transmission
Part type
Crown wheel and pinion
Machine brand
JCB
Manufacturing type
OEM
Compatibility
JCB 3CX, 4CX
All the features

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For the JCB 3CX and 4CX backhoe loaders: crown wheel and pinion 458/70246, an OEM part. The set's ratio is 13/33.

Signs of crown wheel and pinion wear are a whine that changes on acceleration and deceleration, knocking under load, bright metal particles in the axle oil and broken tooth fragments. Common causes are long running with low or dirty axle oil, loss of the pinion bearing adjustment and sudden shock loads. When the set is replaced, the pinion and differential bearings, seals and shims are renewed too.

Specifications

Part number	458/70246
Production type	OEM
Part type	Crown wheel and pinion
System / group	Transmission
Machine make	JCB

Compatibility

According to sources, 458/70246 is a right-hand spiral 13/33 M30 crown wheel and pinion, used on JCB 3CX, 3DX and 4C backhoe loaders and 526-56 and 531-70 telehandlers and made up of parts 458/70247 and 458/70248. The catalogue also has the aftermarket version and genuine version of this part. 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.

Specifications

Machine system
Transmission
Part type
Crown wheel and pinion
Machine brand
JCB
Manufacturing type
OEM
Compatibility
JCB 3CX, 4CX

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