JCB Excavator 701 Fault Code: Loss Of High Speed Travel
Loss Of High Speed Travel · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 701 means the machine will not shift from middle to high travel gear, the operator changes gear but no increase in speed is achieved. JCB points to propshaft speed, clutch pack/park brake pressure, pressure switches, and the engine speed sensor signal as the areas to check.
Medium severity. This fault does not stop the machine from operating, but it limits travel speed and may point to a clutch pack, pressure switch, or sensor signal problem that should be diagnosed before it worsens or affects brake pressure circuits.
What does JCB Excavator error code 701 mean?
Fault code 701 is set when the operator tries to shift from middle gear to high gear during travel and the machine does not respond with the expected increase in speed. This is a functional travel fault rather than a stored numeric diagnostic trouble code with a fixed threshold.
JCB ties this symptom to three mechanical/hydraulic systems: propshaft speed, clutch pack and park brake pressure, and the pressure switches that report clutch and brake status to the controller. A problem in any of these can prevent the transmission controller from allowing the shift into high range.
There is also an electronic angle to this fault. The transmission controller will not energize any gear-shift solenoids if it does not see a valid engine speed signal. If the controller believes the engine is not running, it holds back all solenoid activity, which will also present as a loss of high speed travel.
Common causes of 701
- Incorrect or abnormal propshaft speed, preventing the controller from allowing a shift into high gear
- Low or incorrect clutch pack pressure, which can prevent full engagement needed for high range
- Low or incorrect park brake pressure, which can interact with the clutch/brake control logic
- Faulty or incorrectly reading pressure switches that report clutch pack or park brake pressure state to the controller
- Missing or invalid engine speed sensor signal reaching the controller, causing the controller to withhold solenoid energization because it does not detect the engine running
How to troubleshoot JCB Excavator 701: first checks
- Check the monitor's rpm counter reading (display 0003) to confirm whether the controller is receiving a valid engine speed signal. A reading of 0003 means no signal is being received.
- Select the footswitch for gear change and watch the monitor display: confirm whether it changes from the 'arrow' symbol to the 'hare' symbol. If it does not change, the controller is not registering the gear change request correctly.
- Test propshaft speeds to confirm they are within expected operating range for the gear selected.
- Test clutch pack pressure and park brake pressure to confirm both are correct for the current gear and brake state.
- Test the pressure switches associated with the clutch pack and park brake circuits to confirm they are switching and reporting correctly to the controller.
- Inspect wiring and connectors to the engine speed sensor and pressure switches for corrosion, damage, or loose connections before replacing components.
How the code clears
No separate clearing step is listed for this code. Resolution comes from correcting the underlying mechanical, hydraulic, or sensor signal fault identified in the propshaft speed, clutch pack/park brake pressure, pressure switch, or engine speed sensor checks. Once the fault condition is corrected, normal high gear shifting should resume without a distinct reset procedure.
Frequently asked questions
What does fault code 701 mean on a JCB excavator?
It means the machine has lost high speed travel: when the operator shifts from middle to high gear, no increase in travel speed is achieved. It is a functional travel fault, not tied to a specific stored numeric value.
Why won't my JCB shift into high travel gear?
JCB lists three main areas to check: propshaft speed, clutch pack and park brake pressure, and the pressure switches that report those pressures to the controller. A fault in any of these can block the shift into high range.
Can a bad engine speed signal cause this fault?
Yes. The transmission controller will not energize any gear-shift solenoids if it does not detect a valid engine speed signal. Check the monitor's rpm counter: a reading of 0003 means no signal is reaching the controller.
How do I know if the controller is recognizing my gear change request?
Select the footswitch for gear change and watch the monitor display. It should change from the 'arrow' symbol to the 'hare' symbol. If it doesn't change, the controller is not properly registering the shift request.
Is it safe to keep operating with fault code 701 active?
You can typically keep working in lower gears, but you should get the underlying cause diagnosed soon since it involves clutch pack and park brake pressure systems that also relate to braking and drivetrain safety.
Is there a reset procedure for code 701?
No separate clearing step is listed for this code. Fixing the root cause in the propshaft, clutch pack/park brake pressure, pressure switch, or engine speed sensor circuit should restore normal high gear operation.