Here is a few things ive been into lately. This is a radial piston pump off a john deere tractor
d3b tranny Planitary trans out of d3b
few more
Bushings for 990 boom i need to get started lineboring.
Boom was pretty much completely broken off this jd welded then plated
You got a nice variety there Steve I'll be interested in the 990 when you get into it.Thats a weird looking bearing. How much of the frame are you doing? I've got a spell from boring. I'm selling farm machinery at a field day this week and on the lathe next week doing hook up bosses for a new EX1900 bucket.
Nice work Steve.
Ray as far as i know now the bucket pivots but its in thier shop being cleaned up and then were going to get a good look at it. Its nascar race week at bristol and im near the track im going to stay at home in my shop and avoid the mess. Have you got to get much time in on that nice new mill?.
Thanks Tom
The mill hasn't been turned on for a week. The 1900 bosses and caps I'm doing have 8 hole bolt circles. So it will be doing a lot of drilling and tapping next week. Let us know the sizes of that 990. Always handy to know. We can share information
Currently working on a lull 644b brakes and frame tilt. Anyone with good parts connections on the east coast for lull. Case 580 in background needs brake's and hyd cylinders packed.
990 cat boom b pin bores. Was going to start monday but they added to the job so quoted new price wating for ok.
Thats a good job Steve, I could use a couple big line boring jobs.
That close up of the bore would bring a tear to a glass eye!!! I can almost make enough money to put air in the tyres with a bore and face like that
Finished b pin bores on 990 last week.
Look's good Steve.
Nice work Steve. Bores and faces look spot on!
Thanks Tom and Ray i wanted to try something and drove the bar with a variable speed mag drill and liked it. I didnt have to install the bushings but i was wondering the od was 6.507 what would liquid nitrogen bring the size to. I have always just put them in my freezer but wanting to try the nitrogen when i get a chance thanks again Steve
Steve,nitrogen will bring that bearing down 12 or 13 thou
Thanks Ray i checked today and my welding supply said 25.00 for 5 liters and they would let me borrow a container for a few days if i wanted. How long does it take to shrink lets say a six inch bearing?
Probably about 5 minutes. You need enough nitrogen to cover the bearing and you leave it in till it stops boiling. As a guide I used about 40 litres to do that 1900 bucket. You need good gloves and a cool head If you want to have a go at it I can put up a procedure. It can be a bit daunting the first time you do it.
I've used a regular cool box before now to freeze pins with liquid nitrogen, but nothing beats a purpose-built box with 3-4" thickness of expanding foam in between the inner & outer box (the outer can be made from timber if you want). After you've had a bit of practice you'll probably have an idea of how big a box you need for all sorts of "normal" stuff. If you get caught out by something bigger than will fit in your box you may have to build a bigger one. The bush or pin only just needs to fit into the box, that reduces the quantity of liquid nitrogen required. Pins & bushes are best laid horizontal, they are easier to pick out that way. If the pin has a threaded hole in the end of it fit an eyebolt & a sling to it before freezing, with a bush thread a nylon sling through it before freezing. You can always take the slings off after lifting the bush out of the box and before installing it. I agree with Ray, you still need VERY GOOD gloves but having a sling to make it easier get hold of whatever you're freezing helps enormously. We did a D9 equalizer bar overhaul last week by freezing the centre pin and it literally falls into place - no cylinders required to push it in. From taking the pin out of the box where it was frozen to it being installed in the support takes no more than about 60 seconds. This photo is a 994F lower articulation hitch pin that weighs around 400 pounds. We froze this for 10 minutes in liquid nitrogen and it fell in under its own weight. In the back you can see the eyebolt that was fitted to the pin to lift it into position between the upper & lower hitches, then lower it into place. To get this pin in place took maybe 5 minutes. The other photo shows how we used 3 x 10-ton cylinders to align the hitch before fitting the pin.
Nige thats one hell of a pin. Thanks for the info and pictures i have never seen a 994 i did help rebuild some old 92c's. The 994 makes a 92 look like a 910.
Ray i like all the info i can get. I dont have any boring lined up but they did say that a few machines were coming in that needed some boring. Thanks Steve
You don't pick it up and put it under your arm that's for sure ........ 994 is approx twice the size of a 92, about 450,000 pounds all up. It was one of the easier photos to find. The same principle applies though, even if you're working on a 950. I've been told a few times that after people start using liquid nitrogen they can't imagine what it was like when they had to struggle with hydraulic cylinders and stuff to press pins or bushes in & out. we have our own nitrogen flask and we get it refilled whenever we have a job to do. You can't store liquid nitrogen for long because it evaporates. Another thing I forgot to mention. Every piece of exposed skin should be covered (Long sleeves, a welder's apron, something like that) and you MUST wear good eye protection. A clear face shield like you'd wear for grinding is probably the best, although safety glasses will also work. This stuff is at a temperature over 300-odd degrees below zero. If it splashes it burns whatever it touches. Be careful not to splash it ...........
Cat bucket ear's flexing and busting top caps and under broke loose from rear of bucket liner.
Thats a nice job Steve. You get to weld it all up and bore it as well.
Thanks Ray i hope to start fitting top liner tomorrow and put some extra bracing before putting on the caps. Usually on repairs like this bucket i can keep the bores lined up by checking and moving from one side to the other while welding. I was showing some people that came by the shop today some of your boring jobs and they were impressed. Ray on your facing head how is the feed actuated?
Steve,there is a disc on the rear of the head that is held from turning with a rod.There are pegs on it and a star wheel revolves around them as the head turns.That actuates a nut on a rack that feeds out the slide.The 180 mm head does up to 14 inch faces and the feed is fixed.The larger head will feed out to around 30 inches and has a lot more pegs which can be disengaged,so you can vary the feed from a few thou per rev up to around 30 thou.
Got this one done today got to fix corner on 416 cat hoe 2 ft bucket in morning. This bucket had 1/4 caps and i put 3/8 t1. Also back plate for hinge mounting bumped up to 1/2 and added a few braces under caps.
few more
Tom V could have came down and helped me out.
Nice work Steve.
Did you press the plate? I hope the bores are out of line :tong
Ray i made templates and a local welding shop bent them but they were not even close to the pattern so i took them to a buddy over the weekend and we got them fixed. The bores lined up but ill do better next time.
Well you can't win em all Steve
Here are a few things ive been working on heres a hammer mount i bored and bushed with 4140 bushings.
980 cat pics didnt come out very well
Case skidloader axle repair at mike bos chassis craft.
Broken stick on 305 cat
Rebuilding 4276t jd and a 4219 post pics later