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May 13, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Post edited 1:56 pm – May 13, 2011 by gdw4078
Name is Greg Willcox, I am in TX and will be tearing down my PT-400 bulldozer to redo the clutch, breaks, steering and backhoe. While I am at it, I figue I would do a total rebuild. Should be a fun project. Subscribe to this topic to see my progress.
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May 13, 2011
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Jackpine
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| Lifetime Member | posts 52 | |
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Well… welcome to CTOA Greg. 
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May 13, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Hi Greg, welcome.
This project of yours should be very interesting and informative. Look forward to seeing it unfold.
Not sure what a model PT-400 dozer is. Is it a Yuchai? Guilin? I know that Yuchai used to make a model YCT-406 but that has been discontinued for a couple of years now. Only difference I could tell was that the engine was a four cylinder 40 HP. All other specs seemed to be the same.
Would love to see some pics, at your convenience.
If I get my garage built I plan on doing the brake bands on mine, and maybe some steering clutch work too. Got oil on the left band. I'm coming up on 600 hrs. so I figure that's not too bad, considering.
Good luck, and feel free to post any questions. 
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May 17, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Post edited 3:28 pm – May 17, 2011 by gdw4078
PT-400 is a Guilin Product. My Engine is a 295, a two cylinder model. 26HP I think. I used to Live in Stanwood Wa, which is where I bought this unit. Got her washed up this weekend and I am set to start taking her appart. 
Before this project I designed and built a 2 ton crain in my shop (saftey factor of 2). Did all the work myself.
Here is one thing I need to fix. I am going to redesign this joint. Crack is both sides of blade arm…
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May 17, 2011
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Jackpine
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| Lifetime Member | posts 52 | |
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Nice overhead Greg 
Looks like your "2 ton limit" is based on the hoist itself. The framework appears it will hold more. 
Jack
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May 17, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Post edited 11:05 pm – May 17, 2011 by Bob Rooks
That is one beautiful shop!! Reminds me of when I worked for Caterpillar. They spared no cost on their new shop. Even had dual railroad tracks embedded in the concrete floor for driving the crawlers on, and every service bay had a 10 ton gantry crane like yours. We never lifted anything heavier than a ham sandwich. 
If that failed weldment is where I think it is, the later (Yuchai?) wishbone design incorporated a full width upper and lower gusset plate.
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May 18, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Thanks all for the complements. Shop has it's own 200 amp service and air supply furnished by a IR 5hp 2 stage free standing 80 gal air compressor. Shop is 24 X 36 ft. Very proud of it to tell you the truth.. Shop is kind of messy right now. Going to clean it up some before I back the dozer up into the shop. Oh I forgot. Got a stereo in it too so I can rock out to some classic rock.
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May 18, 2011
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RichWaugh
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| Lifetime Member Elite | posts 280 | |
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That broken joint looks like it was under-engineered to begin with and then subsequent repairs just exacerbated the problem by creating a brittle heat-affected-zone (HAZ) at the edges of the weld. When you weld a piece that is under high stress and vibration like this piece, I recommend that you pre-heat the weld area to about 400°F and also post-heat and peen the welds. That relieves the welding stresses in the HAZ so you don't create a stress riser. The addition of a gusset so the welds aren't under high tensile stress will also help – it will distribute the stresses over a wider area.
Very nice looking shop! I sure wish I had a gantry crane in my shop, but I just don't have the overhead height and I have two posts in the middle. Best I can do is a little jib crane over the welding bench. I have one of those cherry-picker engine hoists but my shop is so crowded now there's no floor space left to roll it! 
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May 20, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Greg wrote:
"Oh I forgot. Got a stereo in it too so I can rock out to some classic rock."
At PACCAR Truck R&D we had a 1,000 watt home made stereo in our two bay shop that one of the engineers built. It was awesome playing "Inagodadavida". Probably where some of my hearing went. Be careful with that stuff…
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July 2, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Any updates? 
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July 15, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Summer time is orchard time for me. No time to work on the bulldozer project until maybe August.  Then it is full time until I get it finished. Goal is to be running again next spring…
Greg
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July 16, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Good luck with the orchard Greg, hope I can hold my breath 'til spring.
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November 29, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Okay, It is time to get back to this project. Shop is cleaned up and dozer will be moved in this week. Disassemble to begin this weekend 12/3/2011. Pics of disassemble to follow soon.
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November 29, 2011
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Little_Grizzly
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| Lifetime Member Expert | posts 184 | |
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Hope you don't mind a whole lot of us looking over your shoulders. 
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November 29, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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November 29, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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November 29, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Watching…
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December 5, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Well she is in the shop. I wanted to back her in but she would only go forward. Plan is to start from the outside and work my way into the center. First part to remove was the top and I already ran into an issue. My overhead crain is not high enough to lift it off the dozer. Opps
Looks like I will have to hang a chain from the roof trusses to get her removed.
Last week I picked up a couple heavy duty shelfs to store parts as I remove them from the dozer
Here is a shot of one of them
As you can see I got the battery already removed. While I was picking up the shelfs the had this used workbench on display and I decided to add that to my shop as well
This will be great for doing detail work. Here is my existing bench all cleaned up ready to get dirty again
This bench is 13 ft long and 6 in thick. I used gluelam beams to build her. She weight 500 lbs.
I don't like wimpy benches…
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December 5, 2011
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Bob Rooks
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| Lifetime Member Platinum Elite | posts 868 | |
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Post edited 9:43 pm – December 5, 2011 by Bob Rooks
Well, I'm drooling now. Very nice work benches. That looks like the industrial shelving from Costco.
I have the same issue with low overhead, but I'm hoping I may be able to jack up the portable gantry crane high enough between the roof trusses. I haven't gotten that far yet – still putting sealer on the concrete. It's slow going.
I think you will only have to raise the ROPS enough to clear the sockets and then maybe you can rotate it.
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December 9, 2011
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gdw4078
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| Lifetime Member | posts 20 | |
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Bob, I had planned on trying your suggestion for the ROPS. Once I get it off the sockets then I would use the overhead crain to move it out of the way.
Plan forward for the next few weeks:
Dismantle the backhoe
Remove blade
Remove ROPS
Remove all actuators/controls/hoses
Remove saddle bags
Remove tracks
Remove radiator (need to be repaired. has a leak)
Remove engine
Remove gas tank
Remove dash board
Hope to have all this done by end of the year
Any tips?????
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