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Scag belt walkbehind has to be pushed

Discussion in 'Mechanic and Repair' started by apache, Aug 25, 2012.

  1. apache

    apache LawnSite Member
    from md
    Messages: 23

    48 Scag belt walkbehind has a problem when in gear. It will move once in gear but stops suddenly & has to be pushed to start again. Especially up hills, using a sulky or any terrain where is has climb.

    I tightened the tensioner under the deck cover taunt but not overtightened. The belts looks ok will be due for new ones by the end of the season.

    This is a new problem that recently started to occur. Prior it ran like a champ. Also, I was going to lube the multiple locations not sure if this would help or not.

    Also, It has a Peerless 5 spd tranny with reverse. Any suggestions would be helpful?

  2. lawnsquadnc

    lawnsquadnc LawnSite Member
    Messages: 31

    Ive had the same problem especially when grass is damp. Please let me know what u did to fix this problem.
  3. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Messages: 4,325

    A belt is slipping somewhere. It's either on the jackshaft pulley (most likely) or the engine/trans belt. Usually adjustments for the belts will make it not slip. Sometimes the belts are so stretched they can't get enough tension on them.
  4. apache

    apache LawnSite Member
    from md
    Messages: 23

    Funny you mentioned jackshaft pulley because I recently had some issues with the jackshaft itself. Repaired that problem with the jackshaft to now have this one. Awwee it's killing because although my scag is older it runs like a champ.

    I don't have any issues with damp grass & it clogging under the deck. She shoots out everything she eats. I try to cut mostly when dry or just a little dew is present.

    Ok the two belt adjustments are:

    1. Under the engine deck between the two belts is one adjustment. Snug with a slight give?
    2. The belts of the of the jackshafts ...aren't they self-adjusting?
    3. Where is the engine/trans belt?
  5. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Messages: 4,325

    Read the manual and look at the mower. Look at how the belts run and it should make sense.
  6. apache

    apache LawnSite Member
    from md
    Messages: 23

    It's been raining here all weekend so far. I did go ahead & print out the manual & adjust it in the week.
  7. apache

    apache LawnSite Member
    from md
    Messages: 23

    I figured out the problem & fixed it. I reviewed the manual & figured out how to adjust the belts. My main issue was the drive belt that gives power to the wheels was loose & going bad. After tighten it up, it actually popped after 5 mins of cutting. That was fine because I was merely trying to check if that was the problem. After taking examining the broken belt; there were chunks of missing sections on it.

    The new belt was pretty self-explanatory to change. You need a 9/16” wrench & deep socket as well. You also have to remove a bracket & long belt that extends to the deck. Now she runs like new; impressed the heck out of me. I ran 3rd/4th gear cutting 1 ½ acres with no problems. Wish I had more to cut that day.:cool2:

    Thanks all who provided suggestions.
  8. 123hotdog

    123hotdog LawnSite Senior Member
    Messages: 482

    Wish I woulda seen this post before you bought those belts. The belts at the Scag dealer here are $75 and I have a local place to get belts and they ship too. My drive belts for my walk behind were $ 16 each. Its the same belt Scag rips us off for.
  9. atreenurse

    atreenurse LawnSite Member
    Messages: 2

    i have the same problem but my jackshafts stop turning under resistance. could that b an adj. also?

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