1693TA
Senior Member
Will 100 ton of force break/force most any track pin loose?
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Track Breaking:
- Thread starter 1693TA
- Start date
John C.
Senior Member
If you are pushing master pins, 100 tons is usually enough for anything up to a D9. If you are asking about the regular pins its usually pretty iffy on even a D8 size track. Standard pins are the same size all the way along the length of the pin. Master pins are slightly smaller in the center and larger on the ends. The large tractors usually use a split link to join the tracks but the large excavators use some type of master pin. Any of the excavators over 100 tons in size usually took the 200 ton press for the master pins because the C frame press wouldn't fit over the links.
1693TA
Senior Member
We really don't see anything bigger than a D8 sized tractor around here. Really don't know sizes on excavators to reference but usually hauled on three axle trailers.
John C.
Senior Member
I don't see crawler tractors anymore with pressed master pins. All I've inspected that were build in the last ten or so years had split link tracks. Even most of the excavators now have slip fit master pins. I know Komatsu still uses a pressed master and I'm not sure about Hitachi. Cat, Kobelco and Link-Belt machines that I've done inspections on all had slip fit pins. Large class excavators would be like a PC1000 or EX1000 and up size.
1693TA
Senior Member
I'm looking to work with machines in the 20+ year old range being mostly Cat, and IH brands. These would be referred to as "farm dozers". Lot of crawlers around here privately owned and I'm looking at a niche market right now. Only dealer still doing track work is a lot of money just to come have a look. I have a 100 ton aluminum "Simplex" hydraulic cylinder and pumping unit and may fabricate a press for working with these kind of machines.
Never did like swinging a sledgehammer as a much younger man, probably wouldn't look at it any more favorably being the older guy I am now
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Never did like swinging a sledgehammer as a much younger man, probably wouldn't look at it any more favorably being the older guy I am now
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John C.
Senior Member
Track work will make a young man into an old man. Track work will make an old man wheel chair bound is short order.
The press doesn't make it any easier to do the work and it does make the jobs take longer.
The press doesn't make it any easier to do the work and it does make the jobs take longer.
tctractors
Senior Member
With Track pressing master pins it's more cost effective to blow both ends of the pin with a cutting torch, then let cool and tap the pin out easily than press them out, setting up any Track press takes a good bit of time and effort it's all heavy, I have 3 Track press kits but hardly ever press old pins out as they are often worn well and a new pin works a lot better, there is a few tricks you will need to learn as you need to shim the links to ensure correct spacing within the chain assembly and plate bolt fit, I use the CAT Service press tooling with the 2 rod set-up, on large excavators I put the 2 rods through the link windows and have pressed in some good sized pins, it can be dangerous work without some care taken so don't have people about that have no reason to be there, I feel there is plenty of pictures of my stuff in Shop Talk it might be of help, I always use a Dummy Pin to keep things on target, home made kit sounds possibly not the best route but might set you off testing the market around you until you think it worth getting some correct tooling, anyhow best of luck but don't waste 3 hours getting a worn pin out that will cost $30 to replace. tctractors.
1693TA
Senior Member
Thanks guys for the tips; I'm listening and learning. All information is useful to someone willing to process it correctly. I'm one to listen to experience when spoken so don't hold back.
Buddy has a D6C with the front idlers shot and sloppy in the mountings. They need to come off the tractor so the bores can be trued back up and either sleeved, or built up for new bearings as they have been run way too long. He also has a few new rollers to replace and I want to say a final is leaking so the tracks would be best off the machine. I don't know about the physical condition of the chains, shoes, sprockets or anything. TCT is correct in his analogy of "testing the market". I'll not absorb any debt for tooling as I can utilize what I already have and although it may take longer to perform any given task, I don't have the overhead a specializing shop does.
I've never done much track work myself. I was more of one to repair things after tracks were broken off a machine, (for instance). The tracks would then be reinstalled. Usually a "GoFor", or "Do this, Do that" type young guy before everyone was forced out of employment with closure of mines in the area.
Buddy has a D6C with the front idlers shot and sloppy in the mountings. They need to come off the tractor so the bores can be trued back up and either sleeved, or built up for new bearings as they have been run way too long. He also has a few new rollers to replace and I want to say a final is leaking so the tracks would be best off the machine. I don't know about the physical condition of the chains, shoes, sprockets or anything. TCT is correct in his analogy of "testing the market". I'll not absorb any debt for tooling as I can utilize what I already have and although it may take longer to perform any given task, I don't have the overhead a specializing shop does.
I've never done much track work myself. I was more of one to repair things after tracks were broken off a machine, (for instance). The tracks would then be reinstalled. Usually a "GoFor", or "Do this, Do that" type young guy before everyone was forced out of employment with closure of mines in the area.
John C.
Senior Member
I have done one machine in the last twenty plus years and it was a slip fit master because someone put the wrong pitch track chain on an excavator. If I had to do it with a press fit, I would burn out the center of the master tap it out with a four pound hammer, do what needs to get done, make the track back up using the burned pin as a dummy and then paying someone with a press to put the new master pin in.
tctractors
Senior Member
A few things that might help you get underway is D6C/D has 1"3/4 dia pins so has the early D8's 2U etc, the D8H/K has 50mm pins the same on the CAT 350 excavator, D7 1" 7/8, 1"1/2 - 1"3/8 - 1" 3/16 are also common pin size, so you will need dummy pins to fit these bore's, the length of them is about 12" for the large pins and 9" or less for the smaller bore sizes, push the dummy pin trough the links and land the anvil part of your press fixture onto the protruding bit of pin, my press tooling has a large selection of press washers that fit into the anvil head to match the size pin I am pressing at the time. tctractors
398370
Well-Known Member
So my 2 cents. Build your press. You won’t regret it. Will come in handy for all kinds of different things. Especially since home built won’t cost 12k to 20k. I built 1 and use for lots of different things truck king pins is just 1 of many different things opens lots of different options
DMiller
Senior Member
Just remember the Masters for a great deal of the OLD IH, Allis, Drott, Dresser, and a few odd others are NLA. They are not just soft steel pins.
1693TA
Senior Member
It's amazing how much a tool built for a purpose gets utilized for purposes never envisioned. Case in point is an antique portable "Blackhawk" 20ton hydraulic bender for schedule 40 steel pipe, or rigid conduit up to 4" diameter. Though a bit cumbersome to set up and use, it does a very nice job bending pipe. If the pipe is filled with sand and capped prior to the bend, it yields almost a mandrel bend or sweep. It has rolling dies for 3/4", to 4" pipe which mount into a frame with the hydraulic cylinder threading in from the top pushing on a shoe bearing against the pipe being bent. This little press also does an excellent job of straightening small engine crankshafts and has done several after someone impacts something rigid in the yard with a lawnmower as instance.
Building upon this idea and needing a king pin press for trucks, I utilized the cylinder threading into a 1.50" thick strip/bar with the center drilled and threaded to receive the cylinder. Outward of this center mounted cylinder by each end are a 1.000" diameter hole to receive 1.000" x 14tpi grade 8 rods, washers, and nuts. There is a corresponding bar or strip with a 2.250" bored hole in the center with outer holes on the same spacing as the upper bar to receive the opposite end of the threaded rods and hardware. 20 ton may not sound like a lot of power for pushing truck king pins out, but I've not had one defeat the press yet. I use an electric pumping unit and don't remember ever getting above 6K psi before the pin broke free. A bit of hydraulic pressure dwelling, and a heavy air hammer with a mushroom bit applied to the axle beam where the pin pushes through usually sets up a frequency that breaks the bond free. Of course judicious use of heat could be used also.
Building upon this idea and needing a king pin press for trucks, I utilized the cylinder threading into a 1.50" thick strip/bar with the center drilled and threaded to receive the cylinder. Outward of this center mounted cylinder by each end are a 1.000" diameter hole to receive 1.000" x 14tpi grade 8 rods, washers, and nuts. There is a corresponding bar or strip with a 2.250" bored hole in the center with outer holes on the same spacing as the upper bar to receive the opposite end of the threaded rods and hardware. 20 ton may not sound like a lot of power for pushing truck king pins out, but I've not had one defeat the press yet. I use an electric pumping unit and don't remember ever getting above 6K psi before the pin broke free. A bit of hydraulic pressure dwelling, and a heavy air hammer with a mushroom bit applied to the axle beam where the pin pushes through usually sets up a frequency that breaks the bond free. Of course judicious use of heat could be used also.
doublewide
Senior Member
Got pictures?