Part number: 459/M2874
Alternate numbers: 25/220804
Manufacturer: JCB (Original)
Function: Gear shifting / Reverse
Compatible transmission: Powershift and Manual (Synchro-Shuttle)
Voltage: 12V
Function & Diagnostics
In JCB machines manufactured after 2005, the gear engagement solenoid is a critical control component responsible for directing hydraulic pressure to engage the correct clutch. Depending on the transmission type, it controls either gear changes (Powershift) or direction of travel (reverse in manual transmissions).
Electrical or mechanical failure prevents engagement of a specific gear or direction, potentially immobilizing the machine.
Symptoms of failure:
Loss of one or more gears in Powershift transmission.
Inability to move forward or backward in manual transmission.
Jerky or abrupt gear engagement.
Transmission-related error codes displayed.
⚠️ Safety Warning:
Before replacing the solenoid, disconnect the battery and ensure the system is depressurized. Hot transmission oil can cause serious burns.
| Brand (Machine Type) | Model |
|---|---|
| JCB (Backhoe Loaders) | 3CX, 4CX (post-2005 models) |
| JCB (Telehandlers) | Loadall (post-2005 models) |
The list above is for reference. Before purchasing, we recommend verifying the part number in the parts catalogue for your machine.
Data sheet
Specific References







In JCB machines manufactured after 2005, the gear engagement solenoid is a critical control component responsible for directing hydraulic pressure to engage the correct clutch. Depending on the transmission type, it controls either gear changes (Powershift) or direction of travel (reverse in manual transmissions).

















