453/00303
  • Brand
    ARIES
  • Article
    453/00303
  • Machine system
    Transmission
  • Part type
    Axle breather
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • Compatibility
    JCB 3CX, 4CX
  • All the features
In stock
0.00 ₺
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For the JCB 3CX and 4CX backhoe loaders: axle breather 453/00303, an aftermarket part.

The breather is cleaned at service and checked that it works, and a broken or blocked one is replaced. It is chosen by part number with the same thread and type as the old one. When washing the machine, do not aim a pressure jet at the breather, as water can get into the axle. The breather is small but important for the life of the axle seals.

Specifications


Part number453/00303
Production typeAftermarket
Part typeAxle breather
System / groupTransmission
Machine makeJCB

Compatibility

According to the product card, 450/13301 and 453/00303 are the rear axle breather of JCB backhoe loaders. Other parts are in Rear axle.

Fitting

Clean around the old breather before removing it. Screw in the new one by hand and tighten it to the specified torque, taking care not to overtighten plastic-bodied breathers. After fitting, check the axle oil level and look for leaks at the seals. The breather comes new. If the axle is overfilled, oil can escape through the breather, so the axle is never filled above the level in the service manual. Fit the breather with its opening facing up and protected from mud splash. On axles with leaking seals, check the seals again after the breather is changed, and renew any seals damaged by the pressure. When washing the axle, do not aim the pressure washer directly at the breather, or water may get inside.

Specifications

  • Machine system
    Transmission
  • Part type
    Axle breather
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • Compatibility
    JCB 3CX, 4CX
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JCB 3CX / 4CX 07/10/2026 36
JCB 3CX PD70 rear axle parts breakdown: drawings and part numbers from the JCB catalogue
This article brings together the drawings and parts lists for the PD70 rear axle of the JCB 3CX backhoe loader from the JCB parts catalogue: the complete axle, the axle arm with hub reduction and brake plates, the drive head with brake pistons, the differential and the remote breather. The example is axle 450/44530 with a 15.78:1 ratio and limited slip differential, fitted to 3CX-T machines with front wheel steering (catalogue 9812/0010, serial numbers 00960000–00989999, 01297000–01297999, 01327000–01349999, 01616000–01621599, 01705500–01709999). Part numbers shown as links open the product pages in our catalogue.
Useful articles 07/10/2026 21
JCB 3CX / 4CX Rear Axle Overheating: Causes and What to Check
The rear axle of a JCB 3CX or 4CX backhoe loader runs hotter than the front axle by design: it houses the oil-immersed service brakes, one multi-plate brake pack on each half shaft. A warm axle casing after a shift is therefore normal. It becomes a concern when the axle gets very hot after an ordinary road run, the machine feels as if it is dragging, there is a smell of burnt oil from the axle, or oil starts leaking past the seals. The usual cause is brake drag: the service brakes or the park brake are not releasing fully. Below, based on the JCB service manual, is what to check and in what order.
JCB 3CX / 4CX 07/10/2026 27
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 54
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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