Experiential MC

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Thu Dec 17, 2015 5:03 pm

http://rs877.pbsrc.com/albums/ab331/MAP ... 0&fit=clip
http://rs877.pbsrc.com/albums/ab331/MAP ... 0&fit=clip

I'm experimenting with a rock shaft from a M on a MC that I'm rebuilding.I have all the clearances I need after taking the heat wrench to the right steering leaver, even the belt pully clears.I will be fabericating a bracket for the top link and attach it to the top of the rock shaft were the seat mounts.
Looking for input, any thoughts?

Post by **Lavoy** » Thu Dec 17, 2015 5:27 pm

Couple thoughts. Rockshaft housing on an M is reservoir, valve, and bypass all rolled into one. Are you going to delete the crawler valve and reservoir and hook everything up to the M rockshaft housing? If not, how are you going to bypass the internal valving and such to operate with the crawler hyd?
Seat mounting bolts are to hold your butt, my guess is it will be a spectacular bang when it lets go, and I personally would be uncomfortable with that happening under my rear end.

Unless you meant mounting under the housing to the 4 larger bolts in the top of the tranny case.
Lavoy

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Thu Dec 17, 2015 5:54 pm

Lavoy, yes I'm not going to use the crawler hydraulic valve, just the pump.
Haven't put a lot of thought in the top link mount Yet may be after the belt pully is on I can use it's mounting bolts also.

gus · Post by **gus** » Thu Dec 17, 2015 6:11 pm

I used one for a custom 3 pt for my 420. Basically gutted it and used a short cyl under the seat.

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Thu Dec 17, 2015 6:27 pm

Thanks Gus yours looks good, gives me some ideas. What do you use your 3 point for? I happen to get a M for parts for the MC and thought I'd do something with the rock shaft.

gus · Post by **gus** » Thu Dec 17, 2015 6:46 pm

I've used it for digging post holes, mowing (brush hog type), grader blade. Mine does not have any provision for float, which I should have put in too. I've lifted the back of the crawler off the ground a couple times mowing some ditches and not lifting the mower high enough. I've modified the top link on the mower to allow some float and that helped.

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Thu Dec 17, 2015 6:56 pm

I have a four foot bush hog that I would like to try hope it has enough power, I use it behind a 22 hp Kubota now.

Stan Disbrow · Post by **Stan Disbrow** » Fri Dec 18, 2015 6:44 am

Hi,

So, just going to lift light 3pt stuff, then. The single piston M rockshaft can't lift much. Mine won't lift my 6' brushhog, at 950 pounds but will a 6' finishing mower at 550 pounds. And, even the bigger dual pistons ones don't do what I would really want a crawler 3pt to do - push down as well as lift.

Plus, even a 3 roller crawler can yank on something so hard, I would fear that casting would be a real risk for being pulled apart should something get stuck back there....and I do not wanna be sitting atop that if it happened.

I use a drawbar pulled Hog behind my 420c. But, one day, maybe I will add a 3pt to it.

Stan

Edit: Oh, and the top link on my M 3pt conversion goes where the belt pulley used to be.

Edit2: added mower weights.

gus · Post by **gus** » Fri Dec 18, 2015 12:02 pm

mapaduke@yahoo.com wrote:I have a four foot bush hog that I would like to try hope it has enough power, I use it behind a 22 hp Kubota now.

I use a 6' brush hog and I have no problem at all lifting it or powering it.

NOTE: You MUST use an over ride coupler on the brush hog. You push the clutch in and the brush hog is still spinning... something has to give, best be the coupling !!

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Fri Dec 18, 2015 3:34 pm

Thanks guys for the info, I'm starting to rethink the idea, not that it's a bad thing you've all made good points. I figured were I have the rock shaft that I would try and make the crawler more useful.

Paul Buhler · Post by **Paul Buhler** » Fri Dec 18, 2015 5:10 pm

Always fun to be a "fly-on-the-wall" during these discussions; I've learned a lot from you guys over the years, then gotten to use some of your thoughts at a later time. Thanks. Paul

mapaduke@yahoo.com · Post by **mapaduke@yahoo.com** » Sat Dec 19, 2015 6:21 am

Any thoughts on the final drives handling the weigh of a four foot bush hog?
Still thinking lol

Stan Disbrow · Post by **Stan Disbrow** » Sat Dec 19, 2015 8:26 am

Hi,

I edited my earlier posts with the weights of the two 6 foot mowers. The Brush Hog is 950 pounds and my M single cylinder lift unit won't quite pick it up. The finishing mower is 550 pounds and it will. I don't have anything in between those two to try and narrow it down.

There are all sorts of bush hogs out there, light, medium and heavy duty for each width, so it would be hard to say what they might weigh. However, I would think even a heavy duty 4 footer ought to weigh in light enough. That 6 foot heavy duty one I have is exactly that: heavy. It is the heaviest 3 pt Cat-I item I have.

Now, my M still sports the original QuickTach equipment with a couple welded up adapters to take the 3pt lower pins and a welded up plate over the hole where the belt pulley would go to take a top link.

So that means the implement mounts closer to the machine than standard for a Cat-I 3pt system. That causes me to use really short driveshafts once I add the overrun unit. That, coupled with the PTO shaft offset (the M series has the shaft offset from what later was normal) tends to eat U joints.

These days, all I use on the back of the M which is PTO driven is a seeder/spreader. Everything else goes on back of the 5103 which is Cat-II and independent PTO. Except the 6 foot Hog, which was modified with a drawbar to hang onto the 420c. Can't poke a tire with a sharp stump-ette if you don't have tires!

There was a time when I had a spare dual piston rockshaft from a 420w that I was going to put on my 420c, but then Lavoy talked me out of it because whatever I made up would likely be ripped to shreds as soon as I got whatever was on the back hung up and all that traction didn't even slow down much less slip.... So I opted to use the drawbar.

Stan

gus · Post by **gus** » Sat Dec 19, 2015 10:49 am

As far as lift goes, mine wil pick it up with easily, but, mine uses a 3" cyl under the seat, not the original internal cyl. I also have a new front pump running at 1000-1200 psi with after market controls. No part of the hydraulics is original equipment.

The finals should be no problem if they can support a loader and tail wts as they came with the factory loader option.

Stan Disbrow · Post by **Stan Disbrow** » Sat Dec 19, 2015 3:29 pm

Hi,

The parts I was referring to ripping apart were the 420 tractor 3-pt parts. Not any crawler parts.

And, the thought of the tractor bit I happened to be sitting atop of ripping apart wasn't something I wish to ever experience.....

The 420 crawler 3-pt parts are very different from any of the tractor ones, including the big (for the 420 series) row-crop/utility variant.

At the time, I had redone both a 420W and a 430W and had a pile of leftover parts, including a rockshaft and 3-pt hitch.

Stan

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