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by jamesc192
Thu Jan 19, 2017 10:36 pm
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Yes think we will have to do that and just go through everything some of it has been rewired last weekend just a case of a bit at a time. Starting to miss the old girl now my 3c3 is having to pull her weight at the moment. Thank you for your reply much appreciated.
by jamesc192
Thu Jan 19, 2017 3:18 pm
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Just wondering if anyone knows exactly where the servo isolator solenoid would be it is an earlier type machine 1988 with the tripple gear pump so slightly different layout than on the picture that essexpete very kindly uploaded to this post. Thanks
by jamesc192
Wed Jan 11, 2017 10:13 am
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Thanks for that I am ok with mechanical stuff but me and electrics just don't mix so hopefully this guy that's coming can sort it have used him before and he is very good. Thanks for the pointers tho. James
by jamesc192
Tue Jan 10, 2017 1:44 pm
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Just a quick update the fuse in the arm rest had blown it looked ok yesterday but I actually tested it today with multimeter and had gone. However the machine moves now but blowing a fuse every couple of minutes now so parked her up disconnected the battery and bit the bullet got a plant fitter/ ele...
by jamesc192
Tue Jan 10, 2017 10:21 am
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Thanks so much for that I have the tripple pump and the picture looks a lot different to my arrangement but going to have a crack at fixing it today otherwise I am going to have to call a plant fitter out as the controls stopped with the bucket in the bottom of the ditch which is not ideal once agai...
by jamesc192
Mon Jan 09, 2017 7:00 pm
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Re: Jcb 812 lost servo controls

Many thanks for that I think the dead man on the later models controlled the tracks as well but not on earlier ones as well. Was it one of the solenoids around the valve blocks can you remember which one as there seems to be a few in tgere? Many thanks for your help cheers James
by jamesc192
Mon Jan 09, 2017 11:45 am
Forum: Excavators
Topic: Jcb 812 lost servo controls
Replies: 11
Views: 493

Jcb 812 lost servo controls

Hi just been cleaning a ditch out and all of a sudden the servo levers stopped working they have gone sloppy with no back pressure to them. The machine still tracks forward and backwards no problem just can't move the boom. I have played with all the switches on the dash but no joy. I remember years...
by jamesc192
Tue Mar 25, 2014 7:14 am
Forum: Excavators
Topic: jcb 812 oil leak
Replies: 4
Views: 397

Re: jcb 812 oil leak

hi, thankyou for the reply it is not the slew gearbox leaking as it is definitely hydraulic oil, but I am going to top up the slew gearbox as it is low on the dipstick.

many thanks

James
by jamesc192
Mon Mar 24, 2014 9:09 pm
Forum: Excavators
Topic: jcb 812 oil leak
Replies: 4
Views: 397

Re: jcb 812 oil leak

hi

thanks for that I am going to try and take it apart tomorrow.

cheers
James
by jamesc192
Mon Mar 24, 2014 4:15 pm
Forum: Excavators
Topic: jcb 812 oil leak
Replies: 4
Views: 397

jcb 812 oil leak

hi all just after some advice really ,i have been working my 812 quite hard over the last week, I tracked backwards this afternoon and noticed a pool of oil on the ground, I got out and had a look it is hydraulic oil coming through the large circular belly plate on the underneath of the undercarriag...

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