Parts that can be interchanged between models

[Gary Sweat]

Cyl. Bore The Piston Rings are Different for some models. I'm sure there may also be other upgrades.

1900 RS 750 724-750-22500
2000 Red /Grn. 724-763-22500
Grn 724-750-22500

Carey

I have come across car parts that the materials were changed and a new part number assigned but the newer part still works fine on the older versions. They assign a new part number so the older part doesn't get installed on later models. Makes it hard to know by looking at numbers if it will work and be a better part than the original. Rather expensive to buy a part just to see if it is the same.

 

[Gary Sweat]

If the engine internals are identical then maybe the difference is nothing more than rated capacity. One example might be better cooling that allows 2000 to run at 20 hp full output continuous and not overheat, if you use it to power a stationary ditch pump etc under continuous full load.

Or maybe less power loss in the (different?) pto.

The most obvious difference might be they found they could run that same engine at higher rpm continuous without an increase in wear so they went back and rated it for the same torque at higher rpm. (Torque x rpm = hp).

There has to be some external reason if the internals are the same.

The cooling could be a difference. I didn't find the radiator listed in either catalog( btw there the same book) for a 1900 or 2000. Must have been an odd design. The water pumps are the same number. Same with hoses etc.

 

[Gary Sweat]

Gary, getting back to your original question about compatibility between models... in looking at the parts catalogs, it's pretty clear that if yanmar had a common part in house, they would use it for any and every tractor that it would fit. To me it means that what you are trying to do (use parts from other tractors on your 1900 to improve performance) is gonna be tougher. In other words, the parts are different enough that Yanmar didn't use something that it already had in stock. Just an observation, but it seems to me that if it could be made to fit, they have already done it.

For critical engine and drive train parts I can see where the tolerances could be different enough that they would not interchange. But, for bolt on parts like hydraulic pumps, alternators, starters, PTO etc, usually it's just a change that they discovered at some point could be made better. Doesn't mean it wouldn't work on an earlier model but I kind of get the feeling that manufacturers don't want you going back with better parts and making it last forever. I get the impression that they would rather you buy a newer "improved" model and if you don't know that you could upgrade your old machine the better for them.

 

[Gary Sweat]

What you are asking could definitely be good info to have available for layman's use,
Back when I work on motorcycles I could spend hours cross referencing parts numbers to find someone who had the part in stock without having ordering it,
I found some parts were the same no matter which name Yama,honda,Kaw,suz etc, was labeled, Could even go different year makes, a part used on say a 1980 honda would be used over onto a 1983 yamaha,ect,etc, as time progresses many parts were built with a newer redesign but can still fit on the older pc it attached to, and then because of the redesign will be another parts number, I found this out when replacing a radiator on our Ford SUV, one that was suppose to fit a truck and had 2 Numbers different in the parts No# but 30.00 difference in price:thumbsup: the only thing I found different in the radiators was the top was not as thick, but again this could been different in design change in year make,
So I would imagine could be possible the same on Jap tractors as well, its just knowing how to cross reference the parts numbers and having a visual on the part, Back in the 80's all we had was microfiche to use today we have the WWW:thumbsup:

That's what I am getting at. When I found out on TBN about the Datsun alternators and then found much cheaper starters that work fine, I started wondering what else is out there that could be used. I've started seeing JD folks getting parts that when I looked at them, look just like some of the parts on my tractor. Would be nice to know if they can be interchanged just in case I can't locate the same Yanmar part. Also it seems a beefier JD 850 front axle can be adapted with very little modifications, mostly just the size of the pivot bushings. That's an upgrade that is worth the money and effort to me.

 

[California]

it seems a beefier JD 850 front axle can be adapted with very little modifications, mostly just the size of the pivot bushings. That's an upgrade that is worth the money and effort to me.

If you find the front axle on a junkyard 850, it might be cheaper to buy its crossmember with the larger bushings.

Or crosmember/front frame rails assembly?? I assume you want the heaver axle for a loader, and these related parts might be heavier too.


Unrelated: I can't see why running a front tire into a curb doesn't bend the axle pivot assembly. Old American tractors had radius rods from the steering knuckles back to the transmission to resist that kind of stress. Yanmars seem to work fine without radius rods, which surprises me.

 

[deepNdirt]

If you find the front axle on a junkyard 850, it might be cheaper to buy its crossmember with the larger bushings.

Or crosmember/front frame rails assembly?? I assume you want the heaver axle for a loader, and these related parts might be heavier too.


Unrelated: I can't see why running a front tire into a curb doesn't bend the axle pivot assembly. Old American tractors had radius rods from the steering knuckles back to the transmission to resist that kind of stress. Yanmars seem to work fine without radius rods, which surprises me.

I'm looking at a front end on a Mitsubishi that looks very close to fitting my 1700, although much beefier looking plus looks like it has the ability to adjust wider, Thanks for reminding me about this, I'm off to the--->salvage yard
I'm going to take some pictures and mesurements,

Update: no pictures.... no front end.... No tractors, seems on tuesday the owner of this slavage yard decided to cash in on the scrap and crushed everything, implements tractors and all,

and i could have gotten that front end for 38 cents lb, proly total 20.00 bucks I guess we'll never know if that Mitsu front end would have fit?

 

[Gary Sweat]

If you find the front axle on a junkyard 850, it might be cheaper to buy its crossmember with the larger bushings.

Or crosmember/front frame rails assembly?? I assume you want the heaver axle for a loader, and these related parts might be heavier too.


Unrelated: I can't see why running a front tire into a curb doesn't bend the axle pivot assembly. Old American tractors had radius rods from the steering knuckles back to the transmission to resist that kind of stress. Yanmars seem to work fine without radius rods, which surprises me.

True. Even if I had to weld in a new 1/2" bottom plate and drill new holes for the pivot support mounts, it would be a stronger front end for the loader. I believe the 2500 is the same tractor but parts for that seem more scarce. I see that a replacement axle assembly is is available but it doesn't look to be any stronger than the original. You would think if an aftermarket item was going to be offered, it would be a better built and stronger replacement.

 

[YannyMan]

You need to look for tractor "families" when it comes to Yanmars, at least for the smaller ones.

All the models listed in the manual for your tractor, should have some parts interchangeability.

As an example:

The YM122, 126, 142, 146 all have the same frames, wheels, front suspensions, body parts. In that "family", there are two different engines (12hp single piston, 14hp twin cylinder) and two different transmissions (2 speed and a 6 speed).