728/30000
  • Article
    728/30000
  • Machine system
    Electrics
  • Part type
    Steer mode control unit
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • All the features
In stock
0,00 ₺
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For the JCB machines: steer mode control relay 728/30000, an aftermarket part.

The unit is screwed down by its two mounting lugs and connects to the harness through a single multi-pin connector. Before the change, check the fuse, wheel position sensors and mode selector switch, since a wrong sensor gap gives the same symptoms. Fit the connector clean and dry. Afterwards, set the wheels straight, select the modes in turn and check that the wheels turn correctly, carrying out the alignment procedure from the manual if needed. The unit is mounted where it is protected from moisture and the direct wash jet, with the connector seal in place. If the wheels often lose alignment, check the wheel position sensor gaps and wiring before replacing the unit, since the sensors are the commonest cause. The unit is chosen by part number. The unit comes new and needs no setting up.

Specifications


Part number728/30000
Production typeAftermarket
Part typeSteer mode control unit
System / groupElectrics
Machine makeJCB

Compatibility

The catalogue also has the genuine version of this part. Other parts are in Relays.

Fitting

After fitting, secure the harness with ties so it does not touch moving parts or hot surfaces, since a chafed wire loses its insulation and causes a short circuit.

Specifications

  • Machine system
    Electrics
  • Part type
    Steer mode control unit
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
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JCB 3CX and 4CX wiring diagrams before and after May 2009: sheets and component keys
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07/10/2026 37
JCB 3CX / 4CX Electrics: Fuses, Relays, Battery, Alternator and Starter Motor Tests
Section C of the JCB service manual (publication 9803/3290-15) covers the electrical system of JCB 3C, 3CX and 4CX backhoe loaders: fuses and relays, circuit diagrams for machines of different build years, battery, alternator and starter motor testing, the wire numbering system, harness repair, earth points and harness drawings. The PDF has 402 pages, most of them harness drawings.
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