New owner old Yanmar

[Lasgambler]

prb51, Your 9.5x24 will hold about 20 gal. each or an added 167 pounds per tire based on a 75% fill. I placed my valve stems at 1 Oclock to accomplish filling just above the inside top of wheel. The valves from NAPA have a bleeder on the side so you can check your progress by turning off supply and pressing the bleeder to see if you have reached the fill level. I got my water valves in Lake Havasu City. Good Luck

 

[svcguy]

Another possibility are the extensions originally manufactured for that particular tractor in the States.

YM240D hub extensions:

Flanges are 6.855 across, .867 thick.
Hub is 6.905 wide, outside to outside (including flanges). Accuracy .001
Axle side hub is drilled, other threaded for lug nuts.
Axle side hub recessed to accomodate axle flange 3.716 x .564 deep.
Flange for rim, 3.721 x .289 high.
Inside diam of pipe 2.108
Outside diam of pipe 2.740

In the original parts book, this is part of the 'adjustable rear system' with a reference to it as a 'extension, rear shaft'. I have them mounted on my YM240 and they really help. I do not run ballast in my tires, but made large wheel weights for mine.

Attached are three pics, one of the hub, one mounted and the tractor.

 

[LMTC]

Tom,
Would you please post the page or section # in the parts manual that shows this adjustable rear system. I was not aware it was actually in the parts book, though I am aware it was provided by Yanmar at one point. Thanks.

 

[YM-135trac]

Another possibility are the extensions originally manufactured for that particular tractor in the States.

YM240D hub extensions:

Flanges are 6.855 across, .867 thick.
Hub is 6.905 wide, outside to outside (including flanges). Accuracy .001
Axle side hub is drilled, other threaded for lug nuts.
Axle side hub recessed to accomodate axle flange 3.716 x .564 deep.
Flange for rim, 3.721 x .289 high.
Inside diam of pipe 2.108
Outside diam of pipe 2.740

In the original parts book, this is part of the 'adjustable rear system' with a reference to it as a 'extension, rear shaft'. I have them mounted on my YM240 and they really help. I do not run ballast in my tires, but made large wheel weights for mine.

Attached are three pics, one of the hub, one mounted and the tractor.

Man, thats neat.... Oh, your last pic (showing front of trac) shows front wheels in narrow stance.I think, swaping left/right wheels should widen front stance too?

 

[prb51]

Svcguy,
That would really solve the problem. Where did you find/buy them and were they expensive?
I found the part number....794240-83200 listed in the old parts manual thru a phonecall but they are checking on availability.
Thanks for the info.

 

[prb51]

Svcguy,
How about a pic/description of your wheel weights. I can fabricate (actually my friend Roger the welder can) locally.

 

[California]

last pic (showing front of trac) shows front wheels in narrow stance.I think, swaping left/right wheels should widen front stance too?

Just my personal opinion - I think for the front it is a good idea to keep the wheel centered over the inner and outer wheel bearings, to keep the stresses where the designer intended.

I don't think the front is going to help much in resisting a rollover. By the time the chassis (engine block) comes down to hit the top of the axle, you would be tipped pretty steep, maybe beyond the point of recovery.

Then snapping an overstressed spindle would tumble you over for sure.


I see those rear wheel spacers in YM240 Operation, and YM240 Parts, under Optional Equipment at the back of the book.

Incidentally, I also see optional stiffener discs that go outside the front wheels. "For Loader Work etc". They are shown only in the YM195 (YM1700) column and show four lug holes, so they fit the 2wd only. Maybe the 6 lug 4wd wheels are stronger.

I could sure use a couple of those discs. I've never folded over a wheel, but the previous owner must have abused this thing, or never tightened the lugs. Both front wheels have weld-repaired spiderweb cracks. I finally bought a pair of correct used wheels in good condition.

I'm interested in the rear wheel weights too. The manual shows a '25' (Kg?) next to the wheel then two 20's that are flat discs. I assume this gives about 140 lbs per side.

 

[YM-135trac]

Just my personal opinion - I think for the front it is a good idea to keep the wheel centered over the inner and outer wheel bearings, to keep the stresses where the designer intended.

I don't think the front is going to help much in resisting a rollover. By the time the chassis (engine block) comes down to hit the top of the axle, you would be tipped pretty steep, maybe beyond the point of recovery.

Then snapping an overstressed spindle would tumble you over for sure.


I see those rear wheel spacers in YM240 Operation, and YM240 Parts, under Optional Equipment at the back of the book.

Incidentally, I also see optional stiffener discs that go outside the front wheels. "For Loader Work etc". They are shown only in the YM195 (YM1700) column and show four lug holes, so they fit the 2wd only. Maybe the 6 lug 4wd wheels are stronger.

I could sure use a couple of those discs. I've never folded over a wheel, but the previous owner must have abused this thing, or never tightened the lugs. Both front wheels have weld-repaired spiderweb cracks. I finally bought a pair of correct used wheels in good condition.

I'm interested in the rear wheel weights too. The manual shows a '25' (Kg?) next to the wheel then two 20's that are flat discs. I assume this gives about 140 lbs per side.

Point taken Califonia, My 226D US dealer years ago told me/showed me how to widen front & back stance w/wheel swap.He said it was made for that? I'm sure it does add stress on front. I had a top spindle bearing crumble/fall down into ring gear/locked-up/ spun the steering wheel and broke steering box& Thank God, only gave me a nasty finger sprain, and did't brake my arm(lucky). After digging into the Beast, Thats when I saw what seemed to be over size bearings on both sides of the ring gear. Looked hard for chips in ring and pinion--not a scratch HA HA yanny's are tough little buggers! As for wheel failure, not concerned. The fractures around lug holes appeard on another tractor, caused by slightly loose(un-noticable)lug bolts/combined w/pushing loader down>slididing off pile>bouncing front-end(yes abuse) Lucky never broke frontend housing but, that would be my concern. Had leaning a tree(way too much for little yanny) fall in the bucket and threw me on the hood like a WWW seen on TV. rear end 3' off ground. WOW(lucky, tree sliped out of bucket on its way down/I don't know why tree got in such a hurry to get to the ground,but it did)Yanny's are tough. My front-end is well tested.(lucky) I've got good use out of my front wide stance on hills before, so steep had to keep loaded bucket&rear counter wt. flat to the ground to move.Just my opinion

 

[prb51]

Well, Hoyes tractor found the part number (same as above) and searched/x ref the part but can't find any listed presently.
My welder bud fabricates parts for heavy maint. road equipment and I'll see if he'll make me a couple to the specs above unless I can find some elsewhere.

 

[svcguy]

LMTC - Information is from the 'Yanmar Diesel Tractor Operation Manual' Model YM240 / YM240D. This is the actual operation manual delivered with the new tractor in 1979. The axle extensions are pictured in the parts pages (page 17) and labeled 'Adjustable rear system' as part number 15, listed as 'Extension assy, rear shaft'. I called Yanmar America and asked if the extensions were safe to use and they confirmed the rear axle / housing /bearings were engineered for them - no problem. Yanmar did confirm that the original extensions are out of stock. I think the only recourse now would be to build them and assure they are dead accurate. Mine are within a thousands of an inch runout.

For the front tires, the comment to NOT reverse the rims is correct. Yanmar confirmed that the front rims should not be reversed for a wider stance as the spindels could fail. While the rear axles are built to allow for reversing the rims for a wider stance (including the axle extensions), the front spindles are not engineered for reversing the front rims.

The wheel weights are made from scrap steel billets 3 inches thick and 14 inches in diameter. I picked them up at a steel fabricator for scrap price. All you need to do is drill for mounting. I will take some pictures when I get a chance.

Tom