The Craftmans Shop > New from Old
It's BIG, Yellow and digs holes! JCB 3CX Project 8 is joining the Tractor Shed
awemawson:
When the dentist had finished poking about in my mouth I was able to start fitting the new (used s/h) slew pots.
First a good clean up of the pistons, remove the old piston seals, backing rings and wear rings, douse with ISO32 hydraulic fluid and fit the replacement seals. Fairly uneventful.
Then a good clean up of the slew pot, again douse it in ISO32 hydraulic fluid and offer it up approximately at the right level using my pump up trolley. Then fitting my patent pot pusher it was pretty easy to pull the pots into place. I did try first doing it manually but that wasn't happening !
Pot mounting face where it joins the slew gearbox is sealed with Blue Hylomar and then those four big bolts need torquing down to 990 Newton Metres :bugeye: So far they are just 'pretty darn tight' - I can't swing the torque wrench where the machine is at the moment - it needs pulling out of the tractor shed.
Then I replaced the hydraulic hoses feeding the pots. One was well past it's sell by date so I had already made up new ones some weeks ago.
I've just downed tools and come in for supper - I'm pooped ! Tomorrow a grand clear up, oil up the slew gear box which had to be drained for the pot replacement, then see if the new pots work !
awemawson:
Hopefully this is the end of Slew Pot issues.
Today I added hose protectors to the new slew pot hoses - mainly as the near side one had originally been grouped with the tiny 'boom lock' hose to give it some support, but the sleeve had hardened and cracked off as I fitted the new hose. The same sleeving had been used where the hoses are clamped between the king post and it's cradle so it seemed sensible to carry on to the off side hose. I already had the spiral wrap so it was a no cost choice !
Then I filled the slew gear box - darn silly place for the filler - the only way of getting at it is to stretch to the boom and dipper out on the ground then reach in behind the boom pivot where the (plastic) filler bung sits covered in all the hydraulic hoses ! And to complicate matters the filler incorporates a breather so a deep socket is needed when you can guess what size it is (1-1/8" AF for future reference)
Squeezy oil bottle is about the only way of getting the oil (4 litres of 75W90 GL4/5 Universal gear oil) in as the spout is needed for its reach.
Having done all that I brought the machine out into the yard where I could try full left and right slew and check no hoses were stretched.
Glad to say all seems to work :thumbup:
The only thing to work out now is how to torque those bolts to 990 Newton Metres - my big torque wrench runs out of steam at 550 NM ! (But they are blooming tight! )
vintageandclassicrepairs:
Hi Andrew and All,
The next time you see a "sump draining pump" in Lidl or Aldi buy one!
Pull off the dipstick tube and fit a same size tube as the outlet side
I have found many uses for the pump since I did this.
Filling almost a gallon of gear oil into my MGB gearbox only took a couple of minutes :ddb:
John
awemawson:
At long last I've been able to make some progress addressing the weeping rod gland on the front shovel ram. It's only a little weep but annoying. I bought the seal kit some months back but I've been unable to unscrew the rod gland nut. I even made a custom 'flogging spanner' but the flogging got to a pitch where I was reluctant to go further as it threatened to bend the rod itself.
So basically I've given in and enlisted the aid of a local hydraulic company. My previous traveling hydraulic man Martin seems to have disappeared off the face of the earth so hunting for another I came across a promising sounding chap and gave him a call. He was refreshingly honest saying yes he was happy to do the job but he actually would remove the rod and take it to Ella which I could do myself. Imagining Ella to be another specialist company I asked for details. Oh NO Ella is a young lady who rebuilds hydraulic rams ! Apparently her father was running a small company out of the family farm and when he passed on she took over the business and is very good.
So today's job was to remove the ram from the machine - I'd already checked that the pins were moveable. Now this ram isn't enormous but it's big enough to be a handful at head height so I enlisted the aid of the Epco engine hoist and I'm glad I did. Disconnecting and blanking off the ports and hoses, and with the ram secured to the Epco with a strop I pulled the pins. The upper end was happy to come away but the lower end fought me fiercely. Turns out that there are steel 'wear sleeves' in the holes in the machine and on one side they were pushed in too far preventing the eye of the ram from disengaging.
Anyway it's now out, sitting on my pump up trolley and waiting for me to take it to Ella - I assume she has well equipped hydraulic benches as this stuck gland business must be fairly common.
Hoping to get it to her on Monday between other duties - more to follow . .
tom osselton:
I sure miss the like button!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version