Jcb 3cx f reg wiring

avalonlife · Post #1 by **avalonlife** » Sat Mar 12, 2016 2:33 pm

Does anybody have a wiring diagram for an f plate 3cx? I have downloaded the manual from the download section but this seems to be for newer models. I have had a problem with it starting, got that sorted now it won't change gears. Any advice? Thanks.

topkit · Post #2 by **topkit** » Wed Mar 16, 2016 9:46 pm

I had a 1986 machine so different type of shuttle to you, but from what you have said you had a starting problem which is now cured and i presume that you mean the forward and reverse is not working properly when you say you cant change gear, if so i would say it has to be something with a neutral switch, you should only be able to start it with the forward reverse lever in the centre ie neutral, There is also a 5A fuse for the forward & reverse solenoid, have you looked at the starter switch and checked all of the connections on the back of it. Hope that helps. The service manual from machine 337.001 on here should be of help, i downloaded it and printed it off onto about 600 pages!

avalonlife · Post #3 by **avalonlife** » Wed Mar 16, 2016 11:57 pm

Many thanks for advice solved problem now dived in the deep end and took wiring harness out and found many many issues basically rewired the harness so many scotch clips in it and solder add ons put back as standard now all fine

Anton_Chigurh · Post #4 by **Anton_Chigurh** » Mon Jul 20, 2026 12:48 pm

topkit wrote:I had a 1986 machine so different type of shuttle to you, but from what you have said you had a starting problem which is now cured and i presume that you mean the forward and reverse is not working properly when you say you cant change gear, if so i would say it has to be something with a neutral switch, you should only be able to start it with the forward reverse lever in the centre ie neutral, There is also a 5A fuse for the forward & reverse solenoid, have you looked at the starter switch and checked all of the connections on the back of it. Hope that helps. The service manual from machine 337.001 on here should be of help, i downloaded it and printed it off onto about 600 pages!

Digging out an old one here... Did a search and trawl & cannot find 337.001 in the downloads. Looking for the wiring diagram for an F reg machine too.

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