B&S Spec comparison and hydro problem!

15 years ago

Okay, new to the forum on the advice of another member:

I have a Bobcat Leo (48") with a 31P877-0121-E1 motor on it. I have run the pee out of it and it has started smoking/burning oil pretty bad.

I just bought another mower (Swisher ZT2560) for $500 and 130hrs on it and a B&S 44N777-0124-E1 on it. The Swisher has a bad right Eaton hydro (778 model) and I have come to realize this part is going to be EXPENSIVE ($850) to replace or replacement parts will be about 3 months from Eaton (monopoly in the industry) to get.

I'm thinking of taking the B&S off of the Swisher and putting it on my Bobcat.

I called Bobcat, and they had an optional 25hp B&S available on my model that I opted NOT to get at the time. He said the model # available was 44677A-0121-E1. I can't seem to find ANY info on these 3 motors to compare them. I need to know crank diameter, shaft length, and the charging amperages. Where the heck do I find something like this? OR, do you know of another supplier than carries Eaton parts IN STOCK? I need the 6 planetary gears to replace in the pump. Thanks for any help!!!

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Comments (7)

roadbike
15 years ago
Have you called Briggs or checked on their website? The last time I checked the Briggs site they had plenty of detailed engine information.
tomplum
15 years ago
Why not replace the headgasket on the cat?
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jp6940
Original Author
15 years ago
I don't know if I have the knowledge to replace the headgasket. I can swap motors, but going INTO one is another story!
I always wanted the V-Twin 25hp model but didn't opt for it when I bought the mower. The quality of the cat is WAY better than the Swisher and I would like to keep the Cat anyway. I just thought of swapping out the Single on the Cat for the V-Twin from the Swisher. I'll have the check out the Briggs website then. I have been checking motor re-sell websites and trying to compare specs that way.....silly me.....
walt2002
15 years ago
Yah, try Tulsa Small Engine Warehouse. Replacing the head gasket on the 31 series is not difficult, I can send you a PDF of the Service Manual for either engine if you like.

I THINK the crankshaft specs are different but check.

Walt Conner
wconner5 at frontier dot com
jp6940
Original Author
15 years ago
44677A-0121-E1 was the optional motor that was available on the Bobcat when I bought it. I would like to find that motor, but cannot-B&S is always changing up the model numbers!!!
I need to look up the specs on the 44677A-0121-E1 and then I can start looking at other B&S V-twins that have the same specs. Do you have any other info on this particular model? (such as crank diameter, crank length, and charging amps?Thanks for your help!!
tomplum
15 years ago
446877-0121e1 is the only engine model that seems to match the #s you have. Here are the facts using my #.(Your # is incomplete) The current Briggs specified replacement engine is a 44Q777 3136 and uses 790132 or 796256 crankshaft. There are 5 service notes on transferring parts from the parts from the original 44 to this engine. Transfer the governor spring, throttle control, muffler from the old engine (or buy new) , remove part # 791412 and add part # 691121. You should also be able to make that engine from a 44P777 0026. that comes w/ 3 service notes. Transfer muffler, oil sensor and governor spring. There are several different cranks for the 44" build. If you find a buy, look up the crank and see if it matches the above crank #s. Obviously, there will be a bit more to this and you want to verify the model #.
jp6940
Original Author
15 years ago
WOOOOOOW! That's more info than even Briggs would give me!! Awesome!
So I was missing a number!? No wonder no one could help me out or even find any info on that particular engine!!! Man, thanks! I will be researching tonight!