Needle bearing (transmission) 917/51400 JCB, aftermarket, option 2

For the JCB machines: needle bearing (transmission) 917/51400, an aftermarket part.

A needle bearing is chosen by inside diameter (shaft), outside diameter (gear bore) and width; for example K40x45x27 means a 40 mm shaft, 45 mm bore and 27 mm width. For thrust bearings, the inside and outside diameters and thickness are what matter. As the needles run directly on the shaft and gear surfaces, their hardness and condition matter as much as the bearing itself. In caged needle bearings, a cracked or distorted cage makes the needles run skewed and soon break, so the cage is also inspected carefully on strip-down.

Specifications

Compatibility

According to the product card, 917/51400 is a needle bearing. Standard bearing designation: NTA2435. Fit is confirmed by the part number. The catalogue also has the aftermarket version and genuine version of this part. Other parts are in Transmission.

Fitting

To change the bearing, take the gear and shaft out of the gearbox and clean and inspect the shaft track and gear bore. Oil the new needle bearing with transmission oil and push it onto the shaft by hand without force; fit thrust bearings with their washers the right way round. Once the gear is on, check that it turns freely without play; after the gearbox is assembled and filled, listen to it on a test drive.