904/20179
  • Brand
    NAK
  • Article
    904/20179
  • Machine system
    Transmission
  • Part type
    Transmission seal
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • All the features
In stock
0,00 ₺
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For the JCB machines: transmission oil seal 904/20179, an aftermarket part. This seal is used in the transmission.

A seal is chosen by inside diameter (shaft), outside diameter (bore) and width, and also by lip type and material. Seals with a dust lip are used in axles and gearboxes working in dirt, and single-lip seals in enclosed housings. A seal of the same size in a different material may harden faster at high temperature or with some oils.

Specifications


Part number904/20179
Production typeAftermarket
Part typeTransmission seal
System / groupTransmission
Machine makeJCB

Compatibility

According to the product card, 904/20179 is an oil seal. According to the product card, it measures 100 x 75 x 12 mm. Fit is confirmed by the part number. Other parts are in Transmission.

Fitting

Remove the old seal without scoring the bore or shaft. Clean the bore, lubricate the seal lip with the working oil or grease and drive the seal in evenly, lip towards the oil, with a flat mandrel on its outside diameter. After assembly, top up the oil and check for leaks after the first run. Where possible, the new seal is set a few millimetres away from the old seal's track rather than on it.

Specifications

  • Machine system
    Transmission
  • Part type
    Transmission seal
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
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JCB 3CX / 4CX 07/10/2026 28
JCB 3CX / 4CX Transmission: Gearboxes, Axles, Pressures and Stall Test
Section F of the JCB service manual covers the transmission of the JCB 3C, 3CX and 4CX backhoe loaders: Synchro Shuttle SS700, Powershift PS764 and PS766 gearboxes, torque converter, front and rear axles, propshafts and oil cooler. It contains technical data, gearbox operation and electrics, pressure tests, the torque converter stall test, fault finding tables and removal procedures. This is issue 9803/3290-16 of the manual; the PDF runs to 306 pages.
Useful articles 02/10/2026 55
Which gearbox and axles are fitted to your JCB 3CX/4CX
Gearbox and axle parts are matched to a specific unit. Here is which transmissions and axles are fitted to JCB 3CX and 4CX backhoe loaders and how to tell them apart. The data comes from the JCB service manual for 3C, 3CX and 4CX backhoe loaders (machines with serial numbers 960001–989999, 1327000–1349999 and 1616000–1625999).
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