Stump Grinder Woodland Mills WG24?

[BLSXJ]

Fallon... just a number check... HP = (torque * rpm) / 5252.... But the engine is not spinning at 540 rpm.... just the pto is. how fast the engine is going depends on the gearing of the pto...

I'm not sure if that is a good counter point or not.... I'm only one coffee into the day, and I dont think its kicked in

 

[Fallon]

Fallon... just a number check... HP = (torque * rpm) / 5252.... But the engine is not spinning at 540 rpm.... just the pto is. how fast the engine is going depends on the gearing of the pto...

I'm not sure if that is a good counter point or not.... I'm only one coffee into the day, and I dont think its kicked in

Most if not all tractors have engine HP & PTO HP ratings published. Engine RPM for peak HP can vary (although surprisingly everybody was within 100-200rpm comparison shopping on a Kubota L4060), so that would monkey with engine HP. But a 540 RPM PTO speed takes any variation out of that equation.

I assume 540 PTO speed on engine RPM is going to be geared to correspond to peak engine HP, or be slightly higher (so you hit peak power when you load things a bit rather than getting a power drop when taxed to the point of slowing the engine). That's just my educated guess though.

The torque curve would greatly affect that falloff as you taxed the engine. It would also define how easy it would be to stall compared with an engine with a more level torque curve.

 

[Tin Knocker]

Torque = HP x 33000 divided by 2n x rotational speed. Or just use an on line horse power to torque conversion lol. The engine provides power to the PTO. This power is rated in HP at 540 RPM of the PTO. However the the engine that produces rated HP at rated PTO speed at 540 rpm varies between models. In this case 2200 to 3200 rpm. Considering torque is more relative in meeting resistance a good question to ask is what torque is the engine putting out at rated PTO speed.

Back on topic, I messed with the slip clutch a little after work today. Interesting that the bolt takes a 5/8 socket and the nut takes a 17mm.

 

[KyleH]

Could be out to lunch, but you can compare three different models with 19-19.5 PTO HP (540 RPM) but they are all at different engine RPM. For example the BX2670 is at 3068 rpm, the B2650 is at 2500 RPM, and the L2501 is at 2105 RPM. If you convert those numbers into torque you'd end up with roughly 33.3 ft-lbs, 41 ft-lbs, and 48.6 ft-lbs, this is why the bigger displacement would or at least should run something like the stump grinder without bogging down as much.

Actually had a chance to use my BX42 wood chipper on both my previous B2650 as well as a friends BX25D, it was quite surprising the difference in how fast the smaller BX engine would bog down or stall compared to the B2650, there would likely be a similar difference between a L2501 and a B2650 as well.

 

[dickfoster]

Don't know why they say 20 to 45 HP but mine is in the sweet spot at 32 so I guess it's good. I can see why they'd say no less than 20 HP but am not sure why no more than 45HP what with the slip clutch and all that. It's should be evident that a 20HP machine is going to have to work a whole lot harder and wear itself more to do the same work a larger machine will do with ease and with less wear and tear. Afterall they put big engines in trucks and small engines in race cars for good reasons even though they may be putting out the same house power.

 

[hawkeye08]

Just pile some dirt beside the stump, so your tractor sits higher.

Scoop a liitle dirt from where front tractor wheels will be and put it where back wheels will be...

 

[dickfoster]

Scoop a liitle dirt from where front tractor wheels will be and put it where back wheels will be...

I think what he was trying to say is just use the front loader to pile some dirt up around the stump for the tractor to get up higher if the stump is too tall and you don't feel like breaking out your chainsaw to deal with it. Of course once you work it down you'd have to do some more loader work to finish it off.
I'd probably just break out my chainsaw and cut it down to size a little, then grind it. Depending on species and condition you could always split up what you cut off for firewood.

 

[milesaweigh]

It looked pretty reasonable to me too. I don't know why the others swing back and forth sideways when it seems so much simpler, easier and cheaper to do it the way Woodland does. As an engineer I've always been a believer in KISS and have often held that in many cases less is more.

Their chippers don't look like such a bad deal either. I've asked for a quote on a package deal. A grinder and an 8" chipper.

I bought their 8" chipper in the spring. Heavy duty, good quality and has chipped everything from dead white spruce to birch and maple with no issues. Way less money than anything comparable.

 

[Tin Knocker]

First impressions - My son and I went through about 35 stumps with it yesterday. There was some frustration in the beginning until becoming more acclimated with the machine. My youngest son took some video of it on his phone in the beginning but not later when we actually got good at it. Video actually depicts a couple of idiots on a tractor lol. On the L3800 with no QD I find an acceptable sight picture of work being performed. However one is leaning to the right, head turned and looking down to obtain that sight picture. A few hours in that position can get old. Im sure operating without HST would make it even more fun. It seemed slow going but in reality we were moving right along. Given enough HP this grinder will tare up a stump in short order. However rough terrain or a mound around the stump can make things tricky. You can find yourself biting nothing to biting more than you can chew as you move forward. This thing has only seen a few hours of use so I cant really give an educated opinion on it. But for first impressions I would give it an A for a land owner. It has a very fair price tag. solid materials and no stitch welding, manuverability on level terrain, aggressive cutting wheel, compactness.
The following is my "seat of the pants" opinion. My tractor is rated 31hp at the PTO. I feel this is just hitting the mark with a power to design ratio. I assume lesser powered tractors should be fine with it, just not as efficiently.

 

[roadhunter]

I bought their 8" chipper in the spring. Heavy duty, good quality and has chipped everything from dead white spruce to birch and maple with no issues. Way less money than anything comparable.

Interesting. Would love to hear more about your experience with the chipper. I really like the angled infeed. There aren't a whole lot of reviews out there for that particular model.