doubles and low rpm's

Discussion in 'Lawn Mowing' started by jsaunders, Nov 4, 2002.

  1. jsaunders

    jsaunders LawnSite Bronze Member
    Posts: 1,781

    put on doubles today for mulching /bagging leaves and had to turn up the rpm. The mower was down 300 rpm's. Do you notice this alot or is it not a problem on larger hp machines. This was on a 15hp 52" hydro w/b.
    Thanks Joel
     
  2. MATTHEW

    MATTHEW LawnSite Senior Member
    from NE OHIO
    Posts: 665

    I noticed a real drag on my 15HP Kohler.

    Took them off the next day.
     
  3. jsaunders

    jsaunders LawnSite Bronze Member
    Posts: 1,781

    I want to mow with the machine for a day with the doubles on and see how it goes. I mowed some of my side lawn- ran over it 2 times and really mulched up the leaves pretty good, and they were wet. I might just go back to single gators if it's to slow.
    Joel:p
     
  4. John DiMartino

    John DiMartino LawnSite Silver Member
    Posts: 2,555

    Doubles on my Dixie pulls the 25 hp down about 100 sitting still,as soon as it hits grass,its down abot 300 rpm,you cant egt it back by rasing the governor,its just out of power,in my case,I set mine to 4000 for a while with doubles,it still dropped below 3400 in no time.
     
  5. jsaunders

    jsaunders LawnSite Bronze Member
    Posts: 1,781

    Did 2 lawns today and took off the doubles and just went with single gators much faster. Need those rpm's up to mulch those leaves.
     
  6. PaulJ

    PaulJ LawnSite Bronze Member
    Posts: 1,776

    I think 15hp is a little low for a 52" cut. I run doubles on a 14hp 36" lesco and give up some rpms in Ideal conditions. latley leaves and sutting 1/4" shorter have realy given the 14 a work out. :p

    I still like the "dust" the doubles make:D
    I have run doubles on a 52" with a 20hp and had no problem
     
  7. Doc Pete

    Doc Pete LawnSite Gold Member
    Posts: 3,469

    My 48 with a 17 kaw doesn't like mulching with doubles. Cutting is fine, but once you start really chopping things up the 17 starts has it's hands full. 15hp on a 52" deck is just too much on the engine....... IMHO.................
    Pete
     
  8. rodfather

    rodfather LawnSite Fanatic
    Posts: 9,501

    I agree with Pete...15hp ain't gonna cut it (excuse the pun) on a 52" deck (especially with doubles in thick/wet leaves). We run 17 and 18's on our 52"s. And there is a noticeable drag when they have double gators on them...we just go a little slower.

    What you lose in speed you make up for by mulching the leaves more with doubles though.

    just my 2 cents.
     
  9. Doc Pete

    Doc Pete LawnSite Gold Member
    Posts: 3,469

    Sounds good to me. FWIW, after playing with blades and the need to double cut with doubles, I noticed the biggest thing that steals power is the "sail" on the blades. I had cut off the sail on one pair of blades, and ran one set of highlifts, and one set of "no sails", and the motor practically didn't know it had an extra set of blades. So, IOW, you might try using the "stock" gator mulchers, and stay away from the "magnums mulchers". Since you are mulching, the sail won't help much because you aren't trying to blow the debris out the chute.
    Just my "two" sense ;) ;)
    Pete
     
  10. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Posts: 11,062

    Out of all the double combos I've ever tried, the one I put on today is the only one I could notice a difference with. DOUBLE HIGHLIFTS with a mulch kit. When you get in thick high stuff the highlift foil really puts a load on the engine at 2 per spindle. I guess its because they catch so much wind and clippings. When all those clippings are up under the deck with nowhere to go and keep getting picked back up what can you expect though?

    Also they were 2 different styles. I did it that way on purpose so the cutting edge of both blades would be perfectly even. Dunno if that made any difference or not.
     

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