JCB 3C11 Back actor play

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Tillywolves
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Re: JCB 3C11 Back actor play

Post #21 by Tillywolves » Fri Sep 09, 2016 12:38 pm

Can I use EP90 instead of HD90 ? I've got 3 litres in the store already. After all, its been running on water for the last 10 years...


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Re: JCB 3C11 Back actor play

Post #22 by SiH » Sat Sep 10, 2016 2:20 pm

My plate was just the same,as were the bolts. Pretty sure it must be frost damage- like a glacier trying to escape! I 'repaired' mine on an anvil and stuck it back on, and filled with oil. Been fine since. ;)

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Re: JCB 3C11 Back actor play

Post #23 by Tillywolves » Mon Sep 12, 2016 10:46 am

That makes perfect sense. I was baffled until I realised that most of the "oil" was actually water. I'll stick the plate in my hydraulic press and flatten it. Hopefully the bolts will come out with a a stud remover bit.

I'll stick some EP90 in it and Bobs your dads brother...

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Re: JCB 3C11 Back actor play

Post #24 by Tillywolves » Wed Sep 14, 2016 7:54 pm

Emptied the slew actuator, and there was no oil in it at all, it was all water... Just a bit of soft oil bits. Ive flattened out the plate and its just had a coat of acid etch primer on it, before I spray it up JCB yellow. 5 litres of EP80/90 gearbox oil was £11 plus the vat, so nice and cheap.

Now, I want to replace the bolts as they are bent and there are only two left. The old snapped ones came out easily without any tools, just finger tight. They are 3/8 by 1inch, I think, and the spanner size is 9/16. Just had a look in the manual and they are UNF.

Ebay I think...

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Re: JCB 3C11 Back actor play

Post #25 by Tillywolves » Fri Sep 16, 2016 10:50 am

Bolts arrived this morning. Manual says UNF but its not whats fitted, so does anyone know what thread they could be. UNF is quite a fine thread, but the bolts I took out are a lot more "open threaded."

Any ideas before I reorder off Ebay ?? :dizzy:

EDIT: I think its UNC.. :o Im slowly understanding this old school imperial stuff now.


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Re: JCB 3C11 Back actor play

Post #26 by Jeremy Rowland » Fri Sep 16, 2016 1:50 pm

Tillywolves wrote:Bolts arrived this morning. Manual says UNF but its not whats fitted, so does anyone know what thread they could be. UNF is quite a fine thread, but the bolts I took out are a lot more "open threaded."

Any ideas before I reorder off Ebay ?? :dizzy:

EDIT: I think its UNC.. :o Im slowly understanding this old school imperial stuff now.


Hi there while I don't know what thread your bolts are you could save yourself a lot of trouble if you bought some imperial and metric thread gauges and a Zeus book from an engineers merchants then you could identify most threads very easily, just an idea.

UNF equals fine thread; UNC equals course thread (American threads)
BSW equals course British Standard Whitworth and BSF equals British Standard Fine (not common these days)
And also Metric fine and course threads

Jeremy


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Re: JCB 3C11 Back actor play

Post #27 by Mrsmackpaul » Fri Sep 16, 2016 9:44 pm

Tillywolves wrote:Bolts arrived this morning. Manual says UNF but its not whats fitted, so does anyone know what thread they could be. UNF is quite a fine thread, but the bolts I took out are a lot more "open threaded."

Any ideas before I reorder off Ebay ?? :dizzy:

EDIT: I think its UNC.. :o Im slowly understanding this old school imperial stuff now.



They will be UNC bolts if its 3/8 diameter and a 9/16 head and I can see the thread is course
all very interesting to a non JCB owner


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Re: JCB 3C11 Back actor play

Post #28 by Tillywolves » Fri Sep 16, 2016 9:46 pm

Thanks Jeremy. I have been working at JCB today, and one of the guys there explained the different threads... A gauge was one of the things recommended.

I use metric all day, and the strange selection of imperial sizes sometimes baffles me...

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Re: JCB 3C11 Back actor play

Post #29 by Tillywolves » Sun Sep 18, 2016 1:29 am

Four nice new stainless steel UNC bolts arrived this morning. Filled up the gearbox with 4.5 litres of EP90, and fitted the nicely painted plate, using a bit of liquid gasket sealer...

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Re: JCB 3C11 Back actor play

Post #30 by Tillywolves » Mon Sep 19, 2016 1:31 pm

Update: No leaks, and works fine. I've noticed that when the rear arm is moved to the right, it stops on the button. But, when moving left, it takes a little more travel to stop, and you can clearly hear a cavitaing/fluid noise for a second before it comes to a halt. Not sure if its coming from the slew actuator or the lever block.

Any ideas on what I should be looking for. ?


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