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  1. #1
    Super Member mjncad's Avatar
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    Default Disc harrow HP requirements.

    Is there a rule of thumb for disc harrow HP requirements? For example, 5hp per 1-foot of harrow width?
    Paraphrasing Douglas Adams - So long and thanks for all the bacon.

  2. #2
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    Default Re: Disc harrow HP requirements.

    I would think that it would depend on how heavy the disc is. We had a heavy one when I was farming that was only 6ft. Many I see today the same size, would take a lot less hp because they are so lite.

  3. #3
    Super Member flusher's Avatar
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    Getting old. Sold the ranch. Sold the tractors. Moved back to the city.

    Default Re: Disc harrow HP requirements.

    Depends on several variables: weight of the disc, depth of blade penetration, soil type, soil moisture. I use a heavy 6.5 ft wide offset disc and pull it with my 2008 Mahindra 5525 (55 hp engine, loaded rear tires, about 6500 lb tractor weight). YOu need to pull a disc at 5-6 mph to get it to work effectively. I have plenty of hp in dry soil. If the soil is wet, then the disc digs deeper and loss of traction is a problem. So my guess is you'll need 5-10 engine hp to operate a disc like this.

  4. #4
    Super Member flusher's Avatar
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    Getting old. Sold the ranch. Sold the tractors. Moved back to the city.

    Default Re: Disc harrow HP requirements.

    Quote Originally Posted by flusher View Post
    Depends on several variables: weight of the disc, depth of blade penetration, soil type, soil moisture. I use a heavy 6.5 ft wide offset disc and pull it with my 2008 Mahindra 5525 (55 hp engine, loaded rear tires, about 6500 lb tractor weight). YOu need to pull a disc at 5-6 mph to get it to work effectively. I have plenty of hp in dry soil. If the soil is wet, then the disc digs deeper and loss of traction is a problem. So my guess is you'll need 5-10 engine hp to operate a disc like this.
    Clarification: 5-10 engine hp PER FOOT of disc

  5. #5
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    Default Re: Disc harrow HP requirements.

    Too many variables to really give you a good accurate answer. From my own personal experience I would say 1/3 of the pulling tractors weight would be maximum weight that you could pull. Width will not matter.
    A disk that is 6' wide and weighs 2000lbs will pull about the same a a disk that is 8' wide and weighs the same 2000lbs. Everything on the wider disk is smaller and lighter weight per foot of width.
    Brian
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  6. #6
    Super Member mjncad's Avatar
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    Default Re: Disc harrow HP requirements.

    Thanks for the replies, I do appreciate it.
    Paraphrasing Douglas Adams - So long and thanks for all the bacon.

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