The Craftmans Shop > New from Old
JCB 803 Saga
awemawson:
Now the manual stresses the need to tighten those cap screws evenly, presumably as any distortion would jam the spool and possibly cause the symptoms that I'm getting, so just maybe that sheared bolt was the issue.
So I removed the spool block, cleaned it up a bit more on the bench, and pulled the spool out. All seemed free moving and clean with no grit. I also checked the other spool while it was on the bench.
A bit of careful drilling removed the broken end of the cap screw, but I wasn't happy with the remaining female thread - running a tap down it, it was rather a loose fit, so I decided to 'helicoil' it - fortunately M8 is a size I carry.
awemawson:
Putting it all back together was just a simple reverse of the dismantling.
Well the good news is that sealing face with all those 'O rings' didn't spew oil everywhere as I feared that it might. However the bad news is that the symptoms remain unchanged - left hand track motor happily runs in slow mode but not in high :bang:
Difficult to know how to further the diagnosis. I would like to positively prove that there is hydraulic pressure to the spool, and the only way I can think of doing that, is to intercept it's feed hose with a made up 'Tee' arrangement with a pressure meter on it - rather a bind but possible.
Unless you have any other suggestions ......... :scratch: :scratch: :scratch:
vtsteam:
The great thing about watching your projects Andrew is that you generally repair sad cases into better than new. So sorry to say, this, I love seeing you have problems :) :) :) :) :) :beer:
TD4:
Good day. I have never owned or needed JCB 3 ton. mini digger, but having followed this saga from its purchase, I now feel I want buy one!! ( not working). So at my age I would have a challenge every day for the rest of my life. your skill and ingenuity amaze me. Malcolm.
modeldozer:
Hi Andrew,
Can not make out from the exploded picture but if possible the ideal testing poins are the passages marked in red, in high speed mode there should not be any pressure in them.
Abraham
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