jcb 3cx No Forward/Reverse/Start, parking brake buzzer is ON

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mickefix
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Joined: Thu May 23, 2013 11:06 am
Real name: Micke

jcb 3cx No Forward/Reverse/Start, parking brake buzzer is ON

Post #1 by mickefix » Sat Jun 15, 2024 1:51 pm

Fuse A5- 10 Amp blown as soon as I put in gear 2. All others work without fuse A5 blowing. The handbrake alarm sounds all the time regardless of position. but stops when the machine starts. Now for the weird I can remove all the relays that have to do with fuse A5. put a new fuse in and turn on the ignition. then I can go through all gear positions without the fuse blowing. but as soon as I mount relay 23 (drive layshaft/ mainshaft relay) fuse A5 goes. but only when the gear selector is in position 2. The machine is a JCB 3cx from 1998. Please can someone help me figure out what is wrong? Maybe I have the wrong wiring diagram for my model?


Topic author
mickefix
Posts: 2
Joined: Thu May 23, 2013 11:06 am
Real name: Micke

Re: jcb 3cx No Forward/Reverse/Start, parking brake buzzer is ON

Post #2 by mickefix » Sat Jun 15, 2024 2:28 pm

the wiring diagram i have, uploaded


gecko.cx
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Re: jcb 3cx No Forward/Reverse/Start, parking brake buzzer is ON

Post #3 by gecko.cx » Tue Jul 02, 2024 6:31 pm

mickefix wrote:The handbrake alarm sounds all the time regardless of position. but stops when the machine starts.

I've got the previous model to yours and there is one buzzer for everything - over temp, oil pressure, hand brake.
What you are hearing is a warning you've got no oil pressure - also why it stops when you start the engine.

The machine is a JCB 3cx from 1998. Maybe I have the wrong wiring diagram for my model?

That shoulds make it a Project 12 with a serial number starting with: 460 ?
The full manual is in the downloads section (JCB>Page4) (I put it there)

I'll have a look at the wireing diagram, but at a guess, it sounds like a shorted solenoid coil or damage to the loom.


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