Yanmar YB 25 Excavator

[Sprinklerman]

Your machine sounds like one a friend has . Its a John Deere , I cant remember the model . But it was built by yanmar . He bought it new back in 1985 or 86 . He had to rebush his tracks , he had to have pins and bushings made
It has the steel tracks . It is a little beast , he still uses it .

 

[AndyBees]

Well, it has been a bit over three years since I last posted to this Thread.

I've used the little Yanmar Excavator quite often during the past three years.

So, now, I need a starter (engine 3T75H). The brushes are worn out and seems no one has them. There is no info on the starter for reference. Any thoughts?

 

[winston1]

Is yours a 15 tooth? Maybe STARTER ASSEMBLY - GEAR REDUCTION: Yanmar Tractor Parts

 

[bindian]

Well, it has been a bit over three years since I last posted to this Thread.

I've used the little Yanmar Excavator quite often during the past three years.

So, now, I need a starter (engine 3T75H). The brushes are worn out and seems no one has them. There is no info on the starter for reference. Any thoughts?

Any local auto electrical shop should be able to source the parts and rebuild it. I know I can get my old Mitsubishi starter rebuild at one of the shops down here.
hugs, Brandi

 

[O2Bdiggin]

So just reviving an old thread, I recently became the owner of the rare and elusive Yanmar YB25. I’m new and will try and get some pics up soon. So far I’ve done quite a bit to it, new paint, new seat, rebuilt all hydraulic cylinders as well as the rotary unit, replaced the bottom rollers (pretty easy job). Only real issue is smokes like crazy but runs perfect. Easy starts, smooth idle, plenty of power, replaced all injectors, drained fuel system. When I got it the dipstick was frozen so I think the last owner just kept adding oil a little oil here and there, so when I changed it it was way overfilled, about a gallon when it probably only takes a quart or two. I have no blowby at all and just did a block test for gases in the coolant and nothing so don’t think the head gasket is gone, does not overheat and oil not milky. I guess it could be the injector or timing but this thing starts and runs so well it’s hard to suspect the pump. Wondering if anyone has any thoughts?

best,

Rob

 

[winston1]

What color is your smoke? Diesel Smoke tells YOU a Story... - Cost Effective Maintenance.

 

[bmaverick]

So just reviving an old thread, I recently became the owner of the rare and elusive Yanmar YB25. I’m new and will try and get some pics up soon. So far I’ve done quite a bit to it, new paint, new seat, rebuilt all hydraulic cylinders as well as the rotary unit, replaced the bottom rollers (pretty easy job). Only real issue is smokes like crazy but runs perfect. Easy starts, smooth idle, plenty of power, replaced all injectors, drained fuel system. When I got it the dipstick was frozen so I think the last owner just kept adding oil a little oil here and there, so when I changed it it was way overfilled, about a gallon when it probably only takes a quart or two. I have no blowby at all and just did a block test for gases in the coolant and nothing so don’t think the head gasket is gone, does not overheat and oil not milky. I guess it could be the injector or timing but this thing starts and runs so well it’s hard to suspect the pump. Wondering if anyone has any thoughts?

best,

Rob

Rob,

Seeing the above YB25 has a 3T75H engine, and a few of the YM tractors do, 10W30 would be the oil grade most popular for the machine. The Yanmar engines are engineered to JIS standards, thus, the oils are not the Big American Iron use of 15W40.

 

[O2Bdiggin]

Ok, thanks for that info. I am running shell rotella 15w40 and will try 10w30 and report back

 

[O2Bdiggin]

What color is your smoke? Diesel Smoke tells YOU a Story... - Cost Effective Maintenance.

It’s definitely a tint of blue but I don’t seem to burn any oil.

 

[O2Bdiggin]

Changed the oil today and added 10w30 full synthetic, I added 3.5 quarts which measured about halfway on dipstick. Definitely a lot less smoke coming out of exhaust, I’ll see if it completely goes away in a couple hours or running, thanks bmaverick.

when I was pulling drain plug I saw some fuel dripping from what looks like a fuel pump on rear part of engine. Didn’t know it was there. Looks like it could be a crankshaft driven pump. Is that right that these engines have manual fuel pumps, most older diesel equipment I’ve owned has been gravity fed systems.
thanks