Fan cowl (diffuser) 123/05899 JCB 3CX/4CX, aftermarket

123/05899

Brand
Yedekparca
Article
123/05899
Machine system
Engine
Part type
Fan cowl
Machine brand
JCB
Manufacturing type
Aftermarket
Compatibility
JCB 3CX, 4CX
All the features

In stock

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Fan cowl (diffuser) 123/05899 is an aftermarket part for the JCB 3CX and 4CX backhoe loaders.

The fan cowl (diffuser) surrounds the fan so that air is drawn through the radiator core. If the cowl is broken or missing, the fan pulls air around it, flow through the radiator falls and the engine runs hot, especially under heavy load. Broken pieces can also hit the fan and damage the blades. The cowl also closes off the spinning fan and protects hands and tools during servicing. Running for long with a broken cowl means air passes through only part of the radiator and the core clogs unevenly. The machine should not be run without the cowl, especially in summer and in heavy digging work. The cowl is plastic and fixes to the radiator at its mounting points.

Specifications

Part number	123/05899
Production type	Aftermarket
Part type	Fan cowl
System / group	Engine
Machine make	JCB

Compatibility

The part is listed for JCB 3CX and 4CX backhoe loaders. The cowl is for the all-wheel-steer (AWS) backhoe loader version. Other parts are in JCB Dieselmax engine.

Fitting

Check that the radiator core is clean while you are there: a blocked core overheats the engine however good the cowl is. Tighten the fixings evenly.

Specifications

Machine system
Engine
Part type
Fan cowl
Machine brand
JCB
Manufacturing type
Aftermarket
Compatibility
JCB 3CX, 4CX

Questions: 0

No questions about this product.

07/10/2026 34

JCB Dieselmax Engine in the JCB 3CX / 4CX: Builds, Technical Data and Servicing

Section K of the JCB service manual (publication 9803/3290-14) deals with the installation of the JCB Dieselmax engine in JCB 3C, 3CX and 4CX backhoe loaders. It gives the technical data for each engine build, the cold start heater electrics with their fault codes and the operation of the viscous fan coupling, together with the removal procedures for the radiator, expansion tank, fuel injection pump and the engine itself. The PDF runs to 30 pages.