Gravely 472 Demo

Discussion in 'Lawn Mowing Equipment' started by puppypaws, Jul 10, 2013.

  1. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 14,493

    I had a was sure that different blades would make a huge difference. Those OEM's were definitely not the right choice. I am not sure why they chose to utilize them. Are you going to use a spacer and see if dropping the blades that 1/4" makes a difference?
     
  2. kymowyurs

    kymowyurs LawnSite Member
    Posts: 124

    Ridin' Green, I tried the Stens 315-792 flat blades with 1/4" spacers on my 260 Pro Turn today and cut 4 yards. Did a great job with the spacers and I really can't tell any difference between the cut when using the Stens and the OEM 09081200 drop down blades. I have commented previously that I thought it was doing better with the OEM's, but I cut in the dew today with the Stens on one yard that was a 2 acre bi-weekly and one of the other yards was from a call I received today while out mowing. It hadn't been cut in 4 weeks but was a small yard, so I took the job. I had to move slow because the grass was tall and still holding alot of moisture. Was well pleased with the discharge velocity overall. I am almost afraid to look under the deck, but it was still discharging well when I finished at 7:45 pm. I actuall believe that the Stens discharge a little farther. Anyway, I just thought I would throw that out to everybody. Thanks.
     
  3. GMLC

    GMLC LawnSite Platinum Member
    Posts: 4,353

  4. kymowyurs

    kymowyurs LawnSite Member
    Posts: 124

    I have learned a bunch from you guys. I was cutting a lot of tall grass(Crabgrass, clover-volunteer stuff) My yards aren't much to talk about and I thought this Pro Turn should cut 2 week old growth, and It will, but It doesn't like it and especially if the stuff has very much dew on it. I thought this thing should just spit out that wet grass and have very little build up under the deck. Thanks for your patience!
     
  5. GMLC

    GMLC LawnSite Platinum Member
    Posts: 4,353

    That stuff is nasty to cut. Its like glue for any mower. Its one thing to have patches of it but if its the whole lawn it will clog a deck.
     
  6. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 14,493

    Having your blades cutting edge down at the plane they are supposed to cut at in relationship to the deck skirt almost always makes a difference. I have ne experience with the Stens, but PSC and GMLC do, and as GMLC stated, he had bad luck with them, but PSC had good, and he has the same size deck as you, so maybe size really does matter.:laugh:
     
  7. kymowyurs

    kymowyurs LawnSite Member
    Posts: 124

    I am running at the same plane by using the 1/4" spacers. No difference in the cut height. Thanks.
     
  8. Ridin' Green

    Ridin' Green LawnSite Fanatic
    Male, from Michigan
    Posts: 14,493

    That's what I meant- using the spacers now puts the Stens cutting edge in line with where the OEM blades cutting edge was/is, and that can sometimes make a huge difference due to the relationship of the blades cutting edge to the bottom of the skirting.
     
  9. kymowyurs

    kymowyurs LawnSite Member
    Posts: 124

    I will keep using the Stens for now and see if I discover anything about them I don't like. They seem to hold an edge good. I install sharp blades every time I clean the deck which is usually after 1 day of cutting. We've had wet grass in Western Ky to deal with the entire mowing season. I try not to complain about the weather, because things can always get worse. Thanks
     
  10. mag360

    mag360 LawnSite Silver Member
    Posts: 2,446

    I'm hoping it does well without using a spacer since that will simplify blade changes when I'm not the one doing them. Since the difference is so small and the front baffles are probably coming off when I hand it over to employees (they would most definitely get bent on a tree root or rock because someone didn't want to lift the deck, or caught on the trailer gate when backing off without raising the deck into transport) I think the extra 1/4 inch or so will tone down frontal blowout.
    I'll try it with the baffles all the way up first in case the taller sail and height difference allow it to perform well - I think there's a real chance of getting enough air flow in the front channel now. The only thing I want to keep an eye on is the discharge baffle since the sail passes pretty close under it like on our 60. The 60 actually bent the baffle right above the sail from all of the wet, heavy grass constantly barraging it this year. It was bent by the end of week 1. I can definitely weld up a reinforcement but these notched foil blades are easier to bend than solid foil and my concern is the discharge blade always winding up with a slight bend and screwing up the cut. Hopefully no issues will arise and we can keep this fix simple.

    I ordered a set of isolators from the 400 series yesterday too - this 272 frame is already set up to fit them although I may have to drill new holes in the seat weldment. Looking forward to a better ride.

    Here are a couple pics of the two blades side by side. You can see that the exmark blades are 1/2 inch wider which adds something like .027 inches to the distance from center to leading edge - it fits and adds incrementally to blade overlap and blade strength. The 850 kawi does notice this difference and I'm sure our 1.2-1.3gph fuel use average is about to go up. If things ever dry out here I think the stock blades will be more than capable and will save some power and fuel. Meanwhile we'll have at it with these

    272blades.jpg

    272blades2.jpg
     

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