Ferris IS3100 throwing deck drive belts

Discussion in 'Mechanic and Repair' started by TPendagast, Dec 27, 2012.

  1. YardApeMike

    YardApeMike LawnSite Member
    Posts: 6

    We have 3 new (4/1/13) Ferris 3100Z, 61" 38hp. Belts have been replaced 2 & 3 times each: #1-39,139 hrs; #2-24,68,120 hrs; #3-10,24,138 hrs. First to fail was factory. I found a v-belt supplier on the internet whose belts last 4x longer and cost about $15 each. My local dealer is new to Ferris and top notch. but the factory is very slow to ship parts. I will ask about the keep kit.
     
  2. aroddy

    aroddy LawnSite Senior Member
    Posts: 300

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  3. aroddy

    aroddy LawnSite Senior Member
    Posts: 300

    The 5103870 is the new # for the 5103670....I just figured that out last week lol. But the deep v idler is a 5102678. Try that and see what you can get out of it. If your dealer can't help you just message me and I'll ship the stuff to you
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  4. YardApeMike

    YardApeMike LawnSite Member
    Posts: 6

    The parts list for my machines (SN 2016417771,2,3) shows the deep v idler as PN 5102678. I assume that is what I have. But it is a flat tread pulley, running on the back of the belt. What should it look like? I do not see 5103870 in the parts list for the 61" ICD deck.
     
  5. Potomac Lawns Inc.

    Potomac Lawns Inc. LawnSite Senior Member
    Posts: 409

    Yard Ape what did you find out I have an older 3100 with a 61 deck and I am getting ready to change the idler pulleys and deck belt. my idler pulleys are also flat.
     
  6. YardApeMike

    YardApeMike LawnSite Member
    Posts: 6

    My dealer got me a "belt keeper kit" & kevlar belts under warranty. The kit is a bar installed on top of the tension idler pulley. The bar holds a post to keep the belt from riding up and out the pulley edges. The kevlar belt is pn 5103870. Waiting to see how long it lasts.
     
  7. greenology

    greenology LawnSite Senior Member
    Posts: 816

    I realise this is an older thread and not the same topic but oh well. Im wondering if any of you 3100z owners have cut with your deck at 2 1/4" & lower? When Im cutting with the deck this low, theres some kind of metallic noise coming from the top of deck area. Maybe a pulley is slightly touching something, I haven't had a close look yet. Just wondered if anyone else has heard this, although Im assuming you guys don't cut this low anyway.
     
  8. Potomac Lawns Inc.

    Potomac Lawns Inc. LawnSite Senior Member
    Posts: 409

    Might check your idler pulley's I know I have replaced them twice so far.
     
  9. YardApeMike

    YardApeMike LawnSite Member
    Posts: 6

    We have a 1500Z with a 52" deck. We bag so the factory recommended we raise the chassis to max (and stiffen the springs). Blade belt would be thrown every day!! And chewed up to boot!! I could see a steep angle from the engine pulley to the tension idler. I installed a 1/2" spacer under the belt tension arm. Solved the problem. We mow at 3 or 3-1/2" so lowering your deck would have the same effect. The noise could be the belt riding to the top of the pulley and trying to climb over the flange. Then the momentarily loose belt slaps the pulley tread.
     
  10. bternes

    bternes LawnSite Member
    Posts: 1

    I have a Ferris IS 3000 lawnmower that keeps throwing its deck belt when the blades are first engaged. I have had it in to be repaired many times, but the problem keeps occurring. I believe that the pulley in the back is not wide enough and it slips off. Does anyone know the name of that pulley and its dimensions? Or, has anyone had this problem and had it corrected? We have had the bearings changed, put washers under a pulley, but it continues to come off when we engage the blades. I would appreciate any information you can help me with this mower.
     

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