25/105100
  • Brand
    JCB
  • Article
    25/105100
  • Machine system
    Transmission
  • Part type
    4WD solenoid valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 4CX
  • All the features
In stock
0,00 ₺
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For the JCB 3CX and 4CX backhoe loaders: 4WD engagement solenoid valve 25/105100, a genuine JCB part. The card also lists 25/974100, 25/101000, 460/34600.

The solenoid consists of a cartridge screwed into the transmission casing and the coil on it. Before the change, measure the coil resistance and check the 4WD switch and wiring. Do not remove the solenoid with hot oil, and catch the oil that runs out in a container. Lubricate the new cartridge O-rings with clean transmission oil. After the change, top up the oil and check that 4WD engages and disengages while driving the machine slowly. Driving for long in 4WD on hard, dry ground strains the axle and transmission parts, so 4WD is used only when traction is needed. If 4WD will not engage, check the switch and fuse first, then the solenoid coil.

Specifications


Part number25/105100
Cross / alternative numbers25/974100, 25/101000, 460/34600
ManufacturerJCB
Production typeOriginal
Part type4WD solenoid valve
System / groupTransmission
Machine makeJCB

Compatibility

The catalogue also has the aftermarket version of this part. Other parts are in Solenoids and valves.

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
    Transmission
  • Part type
    4WD solenoid valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 4CX
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07/10/2026 70
JCB 3CX and 4CX wiring diagrams before and after May 2009: sheets and component keys
Section C of the JCB service manual (publication 9803/3290-15) gives the JCB 3CX and 4CX backhoe loader wiring diagram in two versions: one for machines built up to May 2009 with analogue instruments and one for machines from May 2009 with the digital instrument panel. On the earlier machines the main machine circuit takes two sheets, with separate circuits for the gearboxes and options; the later circuit runs to 15 sheets. Below are the main sheets, the component keys and a guide to reading wire numbers.
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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