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Why upsize the front wheels if the two tractors use identical gear-sets? According to Mitsubishi tractor date, the standard turf front wheel/tire size for both tractors, the Beaver III S373D and the Buck S470D are exactly the same, that being 6-12. Also, according to their data, the rear...

Can the 6-18 rear turf wheels/tires from a Buck (S470d) be used as substitutes for the 6-16 rear turf wheels/tires on Beaver III (S373d) with no problems of binding up? I am wondering why these two models did not originally have the same size rear tires when new?

Good suggestion. No, no photos taken when I had it apart. Will take some when I pull it apart again in the next couple of days after mowing a couple of acres with the GM. My gut tells me the drum needs to be turned, then new shoes installed. Sanding the existing shoes may help some, too, and...

Ruled that possibility out first. The 52 uses a heavy-weight sheathed cable to connect the bottom of the brake pedal to the brake shoe lever. A spring returns the pedal to it’s normal position when not being depressed. All of this is currently working fine, with the linkage cable having been...

Something has changed with the left brake on my Toro Groundsmaster 52. The brakes on these units is an essential component to be used when making very sharp turns, either left or right. So, I had begun to notice this issue last year, but didn’t get around to looking into it. This cutting...

I asked him about that again as well. He attributed it to possibly being the new points not being properly adjusted. Certainly possible. As for the coil being not faulty and the problem having been something else….I am inclined to say the problem was a faulty coil from the outset of the...

yes, new points and condenser.

He didn’t say he tested it, but through the process of elimination (didn’t run correctly with old coil, but did once new coil was installed) arrived at the conclusion it was faulty. All other components in the ignition system were tested or replaced prior to the coil, which was left until last...

Richard, glad you mentioned that, about whether or not he charged for his education. No, he did not charge one cent for that portion. Only for his labor of 3 hours for everything. I furnished the parts. I felt that more than reasonable, and tipped him well for his dedication to getting the...

After nearly 3 months in the shop, the GM 52 is out and runs like new again. It the coil after all. It took the small engine mechanic quite a bit of time, as he was unfamiliar with old Briggs L head engines and had to learn while delving into this one. When I brought the GM 52 to him, I also...

Here’s the latest update. This afternoon, I tried starting the engine dead cold. It started, but not after I had flooded it. With the new carb kit and the new fuel pump having far more pumping ability than the original pump, I will need to learn how to start it again, like a new-to-me outfit...

MossRoad, thanks for reminding me to proofread! Must have hit the “1” and ”2” at the same time maybe? It should have been only “1” pint, not 12 pints. LOL! Stevem5215, no I did the compression tests while it was cold, the same time as I did another spark test. The spark test showed weak spark...

Have the appointment to bring the GM 52 in to a nearby small engine shop tomorrow, where they will check the coil as well as any other suspect components. If a major OH is needed, they could do that, but of course weren’t high on making the recommendation due to cost. (I totally understand, but...

Here’s the latest: The latest carb kit arrived yesterday, so today was the day to put it in. As mentioned earlier, I had pulled the carb off already and cleaned it up as best I could, but still no change in the engine stalling out after a few minutes. Today, when pulling the carb off, I took...

Not a problem at all. I appreciate the support here and will post findings as soon as possible. In the meantime, some other projects here are getting my long overdue attention. :)

Thanks for asking hanie. See my above reply for the latest update. Time hasn’t been on my side the past couple of weeks, especially when reliant on others to follow though as expected. Not to mention, my lawn grass is getting doggone long, too!

Sorry for not getting back sooner. By now, I had hoped to have this thing all figured out! Unexpected delays have prevented me from finishing this mystery off. First, the OEM carb kit purchased from an online seller never arrived. No response to my email requests for a status report. Nothing...

Yes, Jaxs absolutely did as well. I hadn‘t overlooked his recommendation, having put a bookmark on it to refer back once the system is ready to put back into place. The carb remains the first suspect, with fuel pump and lines second. Carb kit should be on the doorstep tomorrow, put into the...

Thanks M59, for posting this. This is a great way to rule the fuel pump “in” or “out” as the problem. A big time saver!

This is the fuel pump used in Groundsmaster 52 to feed the cast iron Briggs 16hp single.

This is written in the original service manual for Groundsmaster 52. There wasn’t oil in the pulse line before putting on the new fuel pump, but I didn’t observe any smoking before the new fuel pump was installed either. Will check it again, as the new replacement fuel pump is purported to...

I paid $35 including postage for an OEM Briggs. I didn’t check on a new carb for it, as I have gone that route before for some much smaller engines and found the quality was unpredictable. Sometimes good, sometimes not. This carb is made to be rebuilt, so thought it best to go with the known...

The problem arose suddenly. No advance warning. Unless the seat is pot metal gray, the usual brass screw-in seat wasn’t there. I looked specifically for it and wondered at the time I had it apart about why there wasn’t any. Well, it’s coming apart again in a few days when the kit arrives...

On the Groundsmaster 52, the pulse line is looped around the dipstick tube. This is how it is supposed to be positioned. Evidently the pulse vacuum is unaffected by any accumulation of oil in the loop.

By “pickup” line, are you referring to the line from the tank to the fuel filter, or the line between the filter and the carburetor? I have already replaced them both with new on the GM after flushing out the tank with a high pressure washer for several minutes. As for the bug…it served as a...

Yes, the problem now exists with fresh non-oxygenated gasoline. If I was a betting person, I would place my money on the problem being inside the carburetor somewhere. I have considerable experience with Kohler engine carbs, but not much with those used by Briggs. So, I can’t say one way or...

Sounds like something on a later Briggs. My Groundsmaster 52 was made in 1980, when flathead (L-head) engines were the norm for lawn mowers and garden tractors. Was the engine you just fixed an OHV engine?

That’s new information for me. Never heard of “washing” gasoline before. Thanks for sharing the know-how.

Don’t know why I didn’t think to mention this before, but you are correct….throttling it down and it purrs like a kitten for as long as I want it to. Throttle it up and it runs rough, seems starved. No backfiring. This is consistent with wife’s observation that if she stopped forward motion...

I have just ordered a new OEM Briggs carb kit to be installed in a few days once it arrives. In the meantime, I do appreciate the many good suggestions for what is going on with this old B&S 16 hp L head cast iron engine, horizontal shaft. It’s true monster of an engine, but has tons of...

Well, some new information discovered this PM. As mentioned above, yesterday wife was out mowing and came back reporting it didn’t totally die as it would before. Considering this some improvement, I then switched out the E10 for some non-oxygenated fuel. Let stand overnight, then today went...

Have had the carb apart once and inspected the needle/seat at the time, then blew it out with an air jet. So, for any larger particles, pretty sure it is now free of any that may have been in it. But, as far as varnish is concerned, I didn’t spray any carb cleaner at the time, because I didn’t...

The lines were all replaced with new, with the exception of the rubber hose which exits the tank near the top and ends open to the atmosphere beneath the tractor, the purpose of which I assumed to be an overflow or for internal pressure relief. Would it not serve the same purpose as a vented...

Some new information to add. Wife took the mower out this afternoon to try it again. She reported that after about ten minutes, while mowing, it suddenly did the shut down thing again. She stopped forward movement, while leaving the blades engaged, and found the engine gradually regained full...

Although I have drained the fuel tank twice, the fuel that I put back in was E10 regular. I am assuming there is no water in it, but to double check that, I’ll drain it one more time, then replace with non-oxygenated regular 91 octane, the recommended modern fuel for old engines. It’s a long...

Sorry, I failed to mention that I have already loosened the gas cap to relieve any vacuum condition that may exist. Also, tried 3 different caps without any favorable results. Any thoughts on how a malfunctioning coil would behave?

Tractor is a Toro Groundsmaster 52 with 16HP Briggs L head cast iron engine, 32000 series. Manufactured back in 1980. The problem is, it runs and cuts fine for approximately ten minutes, then dies. I can interrupt the dying by choking the engine and it comes back to life. But, only for a few...

Thanks folks for adding to this thread. My original request is for serial numbers for the S670, which is the diesel version of the S650. They are a different beast than the gasoline powered S650. Here are some photos of my tractor, plus one of a new one taken from an original brochure back in...

While my Bison S670D currently has ag wheels & tires, the plan is to convert over to turf tires as soon as correct wheels can be located. Already have the tires for them, but finding the wheels by themselves are going to be the challenge. Rears tires are 13.6-16 tires on 12X16 wheels. Fronts...

For members here who own a Satoh/Mitsubishi Bison S670 or S670D tractor, are you willing to share the serial number of your tractor? No need to post all the digits, perhaps leave the last one as an X, but it would be interesting to determine how many of these are still in use, and also if...

Looking to buy a good used front end loader for a Satoh/Mitsubishi Beaver III or Buck. Anybody have or know of one available for sale? Needing one soon. Thanks for any help finding one.

I realize this is a very old ad....but thought I'd check anyway. If they aren't sold, I would be interested.

Other than the engine and rear wheel size, am I correct in assuming the Beaver III and Buck are exactly the same tractor? If so, there wouldn't be a problem putting the rear 18" wheels from the Buck onto the Beaver III, correct? Beaver III has OEM rear 16" wheels. Tractor has front wheel...

As I am not sure how to place a WTB ad in the classifieds, please excuse me if this is not the place to do so. But, I am looking for a Haban front dozer blade to fit my Satoh Beaver III tractor. If you know of one, or have one you no longer use or need, I am interested. Thanks very much...

Looking for some suitcase weights that will actually fit onto the front bracket of my S-373 Beaver III. Did Satoh offer such an option, or will I need to go on a scavenger hunt? Vvm.

Anyone had any success finding a replacement for the expensive OEM coolant temperature sender for the Beaver tractor? There has to be an off-the-shelf unit at an affordable price.......right? If you have found one, please post the identity on this site. Thanks! Vvm.

Have been giving some thought to trying a tank of biodiesel in my Beaver III. Anyone tried biodiesel here who may have some words of caution, or a thumbs-up on using this fuel? Thnx. Vvm.

Has anyone here found a close paint match for the white color used on the Beaver, Buck, Bull, & Bison tractors? Need to paint the fenders on mine and would like a fairly close match. Thanks. Vvm

Was kind of curious......is the twin cylinder S370 engine used in the Beaver an original design from Satoh, or is it another of the Mitsubishi designed diesels? Thought it interesting that there were actually two different Beavers offered simultaneously late in the run, one had the twin and the...

Needing a set of 5X12 front rims for turf tires, from a Mitsubishi/Satoh Buck or Beaver tractor. If you have two rims to spare in unbent good condition, please send email. Thanks very much. Vvm

Has anyone here a recommendation for a front mount snowblower to mount on a Beaver S370D? Pictures of what you have would be great. Vvm

Looking for a replacement hood front emblem for Satoh/Mitsubishi Beaver tractor. I'd be most appreciative if you have one to spare. Thank you!

Anyone know how long it takes to get their membership approved over on the Yahoo Satoh/Mitsubishi forum? I applied for membership over a week ago, but still no response from the moderator. vvm

Is anyone still making a loader for the Satoh/Mitsubishi Bison 4X4 diesel tractor? Or, anyone know of a good used unit available for sale? Years ago, I know that Schwartz model 1200HD was made to fit for this tractor, but I haven't seen one of these loaders around in a very long time. Any...