Yanmar YM135/YM155 Parts Cross-Reference

[gmiller001]

If these tractors used a "standard" style of alternator, I would have certainly converted over to a "Denso" (mini GM or 70's model Japanese car) like the person with the 336D did. However, the alternator in the YM135/YM155 (and YM1500?) has the cooling fan mounted to the front of it. There's really no good way (that I could see) to add a "standard" alternator to it while maintaining a factory appearance and keeping the fan shrouds in place (bear in mind that this is a thermosiphon tractor, as well - so it's important to not compromise the cooling system).

 

[bmaverick]

If these tractors used a "standard" style of alternator, I would have certainly converted over to a "Denso" (mini GM or 70's model Japanese car) like the person with the 336D did. However, the alternator in the YM135/YM155 (and YM1500?) has the cooling fan mounted to the front of it. There's really no good way (that I could see) to add a "standard" alternator to it while maintaining a factory appearance and keeping the fan shrouds in place (bear in mind that this is a thermosiphon tractor, as well - so it's important to not compromise the cooling system).
View attachment 678369
View attachment 678370

UGH. Your machine has that awful dyno setup. OK, you're right. Basically you would loose the OE look.



Is there a cooling hose right behind it? The YM1610 and the YM2310 has that U-hose right behind it. The only way to mount a more modern alternator is to have it mounted higher under the hood on a sure bracket setup and a different belt length possibly.

YM1610


YM2310

 

[gmiller001]

No. The YM135/YM155 (and YM1500?) alternators mount to a plate that is bolted directly to the front of the engine. There is no cooling hose behind it. There is also no water pump (thermosiphon).

I think that trying to adapt a different style of alternator to these tractor models just isn't worth it. You still have to maintain the factory alternator (or at least a shell of it) in order to have a place to mount the fan. The factory alternator was 8.5A. This was designed to drive 25W headlights and 20W tail lights (and the occasional use of a 20W work light). With modern LED bulbs, it's easy to work within the confines of the original alternator while still creating sufficient light. However, the aftermarket alternator I spec'd above is rated at 15A (or 20A - depending upon the seller). It's quite a bit larger in diameter than the original (in fact, I had to file a flat spot on the aluminum housing, in order to get a socket between it and the injector lines to tighten one mounting bolt). In other words, one can nearly double his charging capacity on these tractors for less than $90 (add $30, if you also upgrade the regulator). That really should be good enough - and it doesn't require (drastic) cosmetic changes or compromising the already "iffy" cooling system.

 

[bmaverick]

No. The YM135/YM155 (and YM1500?) alternators mount to a plate that is bolted directly to the front of the engine. There is no cooling hose behind it. There is also no water pump (thermosiphon).

I think that trying to adapt a different style of alternator to these tractor models just isn't worth it. You still have to maintain the factory alternator (or at least a shell of it) in order to have a place to mount the fan. The factory alternator was 8.5A. This was designed to drive 25W headlights and 20W tail lights (and the occasional use of a 20W work light). With modern LED bulbs, it's easy to work within the confines of the original alternator while still creating sufficient light. However, the aftermarket alternator I spec'd above is rated at 15A (or 20A - depending upon the seller). It's quite a bit larger in diameter than the original (in fact, I had to file a flat spot on the aluminum housing, in order to get a socket between it and the injector lines to tighten one mounting bolt). In other words, one can nearly double his charging capacity on these tractors for less than $90 (add $30, if you also upgrade the regulator). That really should be good enough - and it doesn't require (drastic) cosmetic changes or compromising the already "iffy" cooling system.

I guess I missed the 8.5A to 15A~20A alternator update in your chart. That indeed is a way better way.

Did those manual help any? Or did you have them?

 

[winston1]

Probably not worth the time, but I did mount an alternator on my old 2002D. Here is the thread if anyone interested. https://www.tractorbynet.com/forums/yanmar/293154-ym2002d-alternator-possibility.html

 

[bmaverick]

Probably not worth the time, but I did mount an alternator on my old 2002D. Here is the thread if anyone interested. https://www.tractorbynet.com/forums/yanmar/293154-ym2002d-alternator-possibility.html

Really nice work! I got to your post #29. Those images literally relate to my thinking of moving the alt above it's normal location. Hats off to you sir for going the distance of making a beefier 12VDC system. I did like Neat1500 giving pointers how the ignition light works. It reminds me of a time I had to wire a 2-switch setup to a ceiling fan. The directions said to cross the red wire to the black wire. I thought the directions in half English were wrong. I tripped the breaker and sparks flew. :confused2: I then starred at those two wires and thought, well it can't be any worse than what I did. Well, the directions were right. :laughing:



GMiller 001, I tried looking up that 10941N WAI alternator and got nothing in the search engines. How does one find this? Using an international search engine outside my region, I found this ZAP site with it listed. It's the only site I found. Купить 1941N WAIGLOBAL Генератор

 

[bmaverick]

GMiller 001, I tried looking up that 10941N WAI alternator and got nothing in the search engines. How does one find this? Using an international search engine outside my region, I found this ZAP site with it listed. It's the only site I found. Купить 1941N WAIGLOBAL Генератор

Ah ha, there was a tab on the Russian ZAP site to find the Yanmar/Deere p/n cross-references. Got a hit on Amazon. 124660-77990 or 124660-77991 or
Amazon.com: Rareelectrical NEW 12V 2A ALTERNATOR COMPATIBLE WITH JOHN DEERE APPS 12466-77991 12466 1246677991: Automotive

And I found that Lester is the brand for p/n 10941N. WAI is just a re-seller.

400-58018 Permanent Magnet Alternator for Yanmar PMA 12 Volt, 20 Amp 124660-77990
BRAND PART NUMBER
ARROWHEAD APM0014
YANMAR 124660-77990, 124660-77991
LESTER 10941, 10941N

I liked the hunting for info and digging. Some people do crossword puzzles in the newspaper, I like to deep search the web.

 

[gmiller001]

124660-77990 is the alternator that has the rectifier built into it (uses 3-wire regulator).
124660-77991 is the alternator that has the external rectifier (the rectifier is built into the 4-wire regulator).

Even though many of these Internet vendors seem to advertise these two numbers as the same part, they are most certainly not. From what I can tell, the only place that truly sells the 124660-77990 aftermarket alternator is Hoye Tractor. Every other source I've found does not seem to offer a rectifier. The aftermarket unit is mainly advertised as a replacement for the YM1500 (which used a "4-wire" setup) - so it makes sense that it doesn't come with a rectifier.

WAI Global is the manufacturer that produces the Lester Catalog (that starter and alternator rebuilders use to order parts for rebuilds):
Lester Catalog

I actually have the original manuals for the YM135 (Parts, Operator's, Service, and Electrical Service).

 

[gmiller001]

Here's a copy of the diagram for the "4-wire" YM135 regulator (the setup with the diodes in the regulator). I found this on the Internet years ago, but I've never seen it since. Even the Yanmar Electrical Service Manual that I have doesn't include this diagram!
View attachment YM155 Wiring.pdf