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  #1  
Old 12-31-2023, 08:45 AM
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allessence allessence is offline
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Default Davis Taskforce 200

So I picked this non working Davis taskforce 200..

I always wanted a mini dozer and the price of 950.00 seemed reasonable.

the guy swore he had it running few years back..

Well not knowing anything about them and without knowing ahead of time parts availability and such I figured that it's mainly a fabricated unit, that I could fix what was wrong vs having to buy factory parts..


It's a single cylinder Wisconsin 12.5HP with electric start.

The drive unit is a Funk.. The unit is hydraulically driven and has a low and high range.

It's also dual control.. Meaning from the ground walking behind it or from the seat which can also be from 2 positions forwards and backwards..

So the first thing was to figure out why it was not running.. Pulled the carb and it looked like brand new inside.
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__________________
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Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
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  #2  
Old 12-31-2023, 09:15 AM
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allessence allessence is offline
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I had to forge new pins for the pusher assembly and blade.. Cut off the crap the previous owner had welded on..

I'm not sure why people do what they do with no real thought.


the drive axle is an old style arrangement with interlocking knuckles.

Upon further investigation I discovered the drive line and sprockets for the chain were completely used up..

When the dozer was asked to go forwards it would cam on the tracks drive teeth..

At this point I was thinking I'm stuck.. There has to be a way that I can modify the end drive sprockets..

Even in it's broken state it was still a force to be..

We had a snow that turned into 3" thick ice.. the Kubota b6000 fel could do nothing..

This little dozer on the other hand just tore it right off the ground..
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
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  #3  
Old 12-31-2023, 09:32 AM
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allessence allessence is offline
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After the ice storm..

It was time to find out why the machine was not working correctly.

It was worse than expected..

But I also learned the items were semi steel and/or cast steel so were weldable.
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
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  #4  
Old 12-31-2023, 09:36 AM
Lew Hartswick Lew Hartswick is offline
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A touch overboard with the yellow spray can. :-)
...lew...
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  #5  
Old 12-31-2023, 10:25 AM
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allessence allessence is offline
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With careful tig welding I was able to weld the teeth of the couplings and bring back to shape.


I also reached out to a brake lining company and the person I spoke with was happy enough to point me in the right direction on fixing the brakes on the machine..

He told me the materials to get and to epoxy the material to the backing.. And then rivet it.
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
  #6  
Old 12-31-2023, 10:29 AM
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allessence allessence is offline
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In my quest for information I did find a company called Ballintine that made parts for the trenchers..

The 200 being old, the model 300 it's replacement.. The 200 and 300 share the same frame with just a different drive and motor.

So, I ordered some drive sprockets in a search for how to fix the drives before finding out they could be welded..
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
  #7  
Old 12-31-2023, 10:39 AM
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allessence allessence is offline
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I ordered the correct seals and bearings..

I then took it all apart and cleaned it, checked wear surfaces and etc.

The middle shaft was originally filled with oil.. I decided that because of it's inherit weakness and because there was no oil in it that grease would be a better choice..

The way this works is this..

The middle shaft has a bolt at each end that is locked in position.. The middle shaft does not rotate..

The outside items, the sprockets, the cam plates, springs, etc, etc move on bearings on top of this middle shaft..

When the lever is pulled it disengages the cam/knuckles and allows for the ends to slip.. This outside part is simply disengaged..

Since the splines/knuckles are engaged with the drive section or middle outside tube it transmits power thru the knuckles to the outside sprockets..


Really a very simple system.. Problem is the inside shaft that everything runs on is only about 1" diameter.. So when power is applied the whole shaft deflects and the drive will jump a tooth..


If this system had a middle bearing to support the shaft I can see it would be super durable and simple..

Also jumping up the size in shaft, over tube, knuckles would also allow for an easy increase in HP for the drive..


Davis went to the more modern fully enclosed drive instead as used on the 300..


Once i got it all back together, there was not enough adjustment distance so had to find half links.. I was going to make my own and found the drive chain is a standard size.. But by accident I reached out to Ballintine and they had 1/2 links for 81.00 each.. So no brainer..

Took it all apart again.. I also changed the middle shaft over to grease at this point and installed new lower sprocket with new chain..
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
  #8  
Old 12-31-2023, 10:56 AM
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allessence allessence is offline
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The wear from the little bit of use it got when the new sprocket was installed showed nice even wear.


You can see how the tube drive for the middle section is setup..

Having a middle bearing support would really help.. Having the transmission drive directly connected to the axle drive with a common mount would take care of most of the problem of flex..

I figured that the chassis is the most important thing as its highly adaptable.

Welding anything on I want in the future.. Backhoe, 3 point hitch. PTO drive. etc, etc..


This machine weighs about 2200lbs.. it will pull 1500lbs easily.. Where you find the chain skips a tooth is with heavy dirt work with the blade..

The track adjusters loosen up some and that makes it worse since its a trifecta of keeping all the items in adjustment.

In use I can get about a year before adjustments are required.. If I think about it, I'll adjust the tracks and this keeps the drive chain tight..


.. I wanted the 300 axle because it eliminates all the problems..

Interestingly getting the 700.. the drive axle is even bigger and the machine itself is 4200lbs..

The 200 is a serious machine.. It's not much bigger than a riding lawn mower.. But it's all machine and grunt..

If one got trapped foot trapped under the track, there would be no way of pulling it out.. This machine would run right over the person and not even notice..

it's super stable.. I've had it 30Degrees on a side slope sideways..

It will climb a 45Degree slope while pushing dirt.

I've pulled 1200lbs logs..

This machine I broke and dislocated my arm on..

I was pushing fireplace length up to the splitter and one of the rounds moved and pushed the hydraulic press frame and it nearly hit me in the head..

I used my right arm to deflect it and it trapped my arm between the machines back rest and the press frame bending my elbow back 90 degrees..

Anyhow, there you have it..
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__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
  #9  
Old 12-31-2023, 11:02 AM
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allessence allessence is offline
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This was just after most of the repairs.. with the original transmission chain and sprocket..



https://youtu.be/MAx7nGFrSWM?si=eaT6pRq5OWOpcwXm
__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
  #10  
Old 12-31-2023, 11:04 AM
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allessence allessence is offline
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Quote:
Originally Posted by Lew Hartswick View Post
A touch overboard with the yellow spray can. :-)
...lew...
LOL.. I still have a quart of that Greeny Gobble paint..


She is easy to see that's for sure.
__________________
_________________
Jennifer

If I defend myself I am attacked.

My meaningless thoughts are showing me a meaningless world.

My attack thoughts are attacking my invulnerability.

I'd like to think of something smart, but I don't want to hurt myself.

My google+ page

DoALL 36"
Another Johnson model J Project
Lathe? Maybe..... 1958 SBL 13"
Yeti Esseti Aka running welder on 3phase.

https://www.shopfloortalk.com/forums...860#post766860
Reply With Quote
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