Bent deck on 60" Lazer

Discussion in 'Lawn Mowing' started by Sooners, Aug 9, 2004.

  1. Sooners

    Sooners LawnSite Member
    Messages: 190

    Well, evidently the deck on my 60" Exmark isn't indestructible after all. I have been getting a bad cut (sawtooth effect) on my Bermuda lawns lately. I periodically hit stumps, rocks, tree limbs, etc. in some of the tall grass I cut.

    I leveled my deck and then checked the blades blade tip to blade tip and then from concrete to the bottom of the blade tips going across the 60" dimension. I found all three are not parallel with the ground. DUH!

    Anyway, I shimmed the mandrels with a washer, but I still don't have a great look. It's better, but not perfect.

    My question is: How do some of you guys (or gals) repair your decks. My dealer didn't really offer to work on it. I plan on taking it off, turning it upside down and putting a straight edge across the bottom from front to back and measure around each mandrel hole. Where it's off I would try a sledge hammer to beat it back. Since the blades were off approx. 1/4" max. at the tips, that would mean the mandrel area might be off only 1/16". If this is true, that could be very difficult to find. Any suggestions??
  2. Kelly's Landscaping

    Kelly's Landscaping LawnSite Platinum Member
    Messages: 4,725

    Could be a bent spindle or atleast you can hope thats a lot cheaper then a new deck. When I use to work for my last boss he bent the deck unloading and loading it on a trailer that was to steep. The way he fixed it was banging the spindles back to level with a sledge hammer not pretty but it did work.
  3. steve122

    steve122 LawnSite Member
    Messages: 208

    Did you check for bent blades? Take them off and sight along the blade. I've found that just hitting sticks in the grass will bend a blade slightly and cause it to give the yard an uneven look. I've got six lasers Z's, all 60" decks and my guys over the years have hit sewer lids, power steering pumps, rocks, tire irons, you name it they've hit it. We mow in low income housing projects where it is not unusuall to find somen stripped a car over the last week and used the grass for disposal. Never have bent a deck, but had to buy a 20 ton press to straighten blades. Before anyone says they'll break if staightend, could be but haven't had one break in 4 years. Many times we've found a cracked spindle housing, with the crack hidden by clippings causing the problem. I'd try a set of new blades before I'd go banging on the deck with a sledge. I did manage to bend the deck on the Great Dane we've got, used a sldge on it just as you are contemplating. Worked fine, but I feel I got lucky in getting it just right.
  4. txlawnking

    txlawnking LawnSite Bronze Member
    Messages: 1,905

    Sooners, I would definately check for a bent blade, AND a bent bolt. I hit two gnarly things with in a week with my Dane Surfer... a Torque converter ( not kidding, it was partially buried ) and a burly telephone guy wire anchor someone had buried to tie a dog with... the damage was.. cracked, then busted spindle housing, bent blade, and the bent bolt, plus a bearing that needs to be replaced... Check ALL of these items before you go beatin'... BTW, though, I have straightened decks with the Hammer/ torch method.
  5. Sooners

    Sooners LawnSite Member
    Messages: 190

    Good idea! I can take the spindles and put them in a lathe to check for concentricity. I'll check that out first.
  6. Sooners

    Sooners LawnSite Member
    Messages: 190

    1. I did put new Exmark Excalibur blades on to check the deck. I thought the same thing at first since I have so many resharpened blades. But it's not the blades.

    2. I didn't mention it earlier, but one of the mandrel housings is cracked clean through. The largest pc. has the entire spindle through it and four bolt holes. The smaller pc. has 2 bolt holes. Since the large pc. is tight against the deck, I basically ruled it out. May be worth looking at again though. BTW, all 3 blade are pointed at an angle and only 1 mandrel hsg. is cracked.
  7. Sooners

    Sooners LawnSite Member
    Messages: 190

    1. As I mentioned in the previous response, I checked it with new blades.

    2. I don't believe my bolts are bent because I change blades daily and don't have any problems. How can you bend a bolt? I would asume the spindle could be bent without harming the bolt.

    3. The bearings might be worth looking at. However, wouldn't I have a bad vibration if they were bad? I didn't feel slop in the blade spindles, but then again, I wasn't looking for it. Could be in the early stages of bearing failure though. I'll check it out. Thanks.

    BTW, you don't think it could be that tough St. Augustine grass causing the damage? Just kidding Tex. LOL.
  8. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    exmark had a problem back 8 or 10 years ago with the decks bending or warping around the spindle ring.there is a fix i have done a few with great results.
    they have 3 steel plates that take the place of the old ones under the deck i dont have the part numbers but there is a service alert on it i am at home so i dont have the part numbers
    call me today at work and i will give them to you
    1-800-926-3881 my name is john i work for chuck mason equip sales
  9. Sooners

    Sooners LawnSite Member
    Messages: 190

    Thanks Sawman. I didn't read your post until after 5 pm. I'll try and call you tomorrow (wed). BTW, my Lazer is a 2002 model.
  10. dvmcmrhp52

    dvmcmrhp52 LawnSite Platinum Member
    from Pa.
    Messages: 4,205

    I know you used new blades to check it but............
    I have a new set of blades that are FAR from straight.

    Might just check the blades themselves for straightness just for kicks and giggles.

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