I've heard up to 25 percent on a goose, but yup. You are only going to do 14 to 18 k on a bumper pull, much more and you are in air brake land. Really easy to be in class a cdl land before that, honestly depending on the truck 14k is honestly the limit of a bumper pull, and assume cdl for a goose.
Last Saturday a stump sub dropped the ball on a job. I spent Monday looking for a machine in stock, then a deal on a machine in stock. Tuesday I paid for the machine and booked shipping with pickup Wednesday. Thursday I found and bought the enclosed trailer (happened to be local). Friday I left to get the machine because the broker didn’t get the machine moving Wednesday. Got back home Saturday and spent 1.5 hours grinding on my property before going to do the 34 stumps from the previous Saturday.
Rayco RG80 grinder.
7x16’ enclosed trailer.
VERY happy with the grinder’s performance relative to a 7015TRX, which was the other contender.
I actually think it’s pretty compact/svelte for being 85hp.
Here it is compared to a RG45, which is 45hp.
The 80 compared to the 45 is:
700lb heavier
They say 20” longer but it seems closer to 10” in real life
2” narrower with the duals on (same 34.5” with them off)
Man Carl, that thing is badass. By huge i meant more than big enough to not mess around at all, I've never ran anything over 35 hp. So i assume there's no more stump sub?
I sold the treemek and grapple truck back in October 2017, the deals were too good to pass up. Spring of 2018 I built a single axle hook lift truck with a tag axle and still had my excavator. For accessing trees I still use (and sell) a Nifty Lift SD64.
Normally the tag axle is down with the 13klb excavator in the back, but I can pull it up for tight turning and such.
They have the RG74 for $20k more... so far gas vs diesel is a non issue for me. Burn 25% more gas, but diesel costs 25% more so fuel costs are a wash. Engine longevity is a practical wash. Maintenance costs favor the gas. In the unlikely event of needing to repower the gas cost will probably be 1/3 of the diesel cost. The RG80 has an 11hp advantage over the Carlton 7015TRX and I paid $17k less for my RG80 vs a 7015TRX with the 7015HD TRX costing an additional $5-7k plus however long the lead time is to get one.
The Rayco controller with engine speed, wheel engagement, and swing speed adjustments all being on the remote plus Command Cut (basically like autofeed for a chipper) is leaps and bounds better than the 7015 remote. The swing speed adjustment plus command cut means keeping the engine in its peak power band is fairly easy, allowing a real world advantage of the 85hp gas (smaller RPM power band) over the 74hp diesel (wider RPM power band).
The extra cutting depth of the RG80 vs the 7015 (21" vs 15") is substantial, especially on larger stumps where the chips pile up. The 7015HD has a 22" depth and 80" swing, which is well worth the added expense over the normal 7015.
As always, things are subject to change with time and perspective, but the RG80 so far is a clear winner over the 7015 or unavailable 7015HD.
Here's a pine stump I cut last year above the old fence line. Took 11 minutes to grind, guessing it was 4' tall, maybe a pinch over. The top of the white clamp on the cutter head's hose holder is at 55".
I wear ear plugs either way, but the sound levels are probably the quietest grinder I've had to date. I'd have to have it side by side with a water cooled 7015 to decide which is quieter. It's substantially quieter than the Deutz 7015.
I'm fixing to go grind the last two stumps on my property, I'll set the camera up and see if the video is worth posting. I'm very much looking forward to swapping out to Green Teeth, the Rayco absolutely suck on this machine, they weren't so bad on the RG50 or RG85 (but not as good as Green Teeth anyways).
Yep, haven't used it in years. I romanticize rebuilding it, but that'll probably never happen, juice vs squeeze.
Oh, chip capacity isn't great, but it isn't terrible/worse than I expected. It's a 36" capable machine with 85hp. If the chips get in the way, spinning around and shoving them is an option. So far the biggest stumps I've ground were ~36" at the cut, and I ground them from one side (vs attacking from another side to get fresh ground for chips. Only one that I recall did I shove the chips out of the way towards the end to see where I needed to grind more.
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