Crown wheel and pinion 458/M1761 JCB 3CX/4CX, genuine

458/M1761

Brand
JCB
Article
458/M1761
Machine system
Transmission
Part type
Crown wheel and pinion
Machine brand
JCB
Manufacturing type
Original
Compatibility
JCB 3CX, 4CX
All the features

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Crown wheel and pinion 458/M1761 is a genuine JCB part for the JCB 3CX and 4CX backhoe loaders. The set's ratio is 11/33.

The crown wheel and pinion turn the drive from the propshaft through 90 degrees, pass it to the differential and provide the axle's main reduction. The two gears are machined and matched together, so they are always replaced as a set; a new pinion with an old crown wheel will not give the correct contact pattern and will soon become noisy. The gear ratio (pinion and crown wheel teeth) decides the axle's and machine's speed and pulling character, so the new set must have the same ratio as the old one.

Specifications

Part number	458/M1761
Manufacturer	JCB
Production type	Original
Part type	Crown wheel and pinion
System / group	Transmission
Machine make	JCB

Compatibility

According to sources, 458/M1761 is an 11/33 crown wheel and pinion (bevel gear set); the product card gives it for the front axle differential. 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
Original
Compatibility
JCB 3CX, 4CX

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No questions about this product.

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