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Thread: fisher humphries hedge cutter

  1. #1
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    fisher humphries hedge cutter

    We have an old Fisher Humphries long reach hedge cutter. It has a small pressure tank on which has a sign which makes reference to ` accumulator and nitrogen (inert). ` I am assuming this was something to do with smoothing the hydraulics?

  2. #2
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    Re: fisher humphries hedge cutter

    This is correct.
    it is most likely a sealed unit which cannot be serviced.
    the rubber diaphragm inside may have gone by now, they can be replaced easily.
    it is designed to take the bumps out of the system.
    Ixworth Solar Farming Ltd.

  3. #3
    Senior Member T P's Avatar
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    Re: fisher humphries hedge cutter

    I had a couple of them FH machines, the item you refer to is an accumulator to allow the machine to float when cutting grass verges. It will have a tap near it which is manually turned on for verge mowing and off for hedge trimming. The machine behaves differently if it is working and turned on in that it can be set with minimal weight on the roller and it will float over a slight hump. Note from experience it doesn't "float over" the little concrete tombstones for fire hydrants . The reinforcing rods in them are much more durable than the concrete which seems a poor quality mix. Back to the accumulator, definitely a good job if it works. Always put the pto out and stop the tractor after holding the lever in the lower position for about ten seconds to void the system of pressure when turning the tap on/off. Be careful working around the accumulator as it can store high pressure oil for a long time and potentially cause an injection type injury long after the machine has been in use.

  4. #4
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    Re: fisher humphries hedge cutter

    Quote Originally Posted by T P View Post
    I had a couple of them FH machines, the item you refer to is an accumulator to allow the machine to float when cutting grass verges. It will have a tap near it which is manually turned on for verge mowing and off for hedge trimming. The machine behaves differently if it is working and turned on in that it can be set with minimal weight on the roller and it will float over a slight hump. Note from experience it doesn't "float over" the little concrete tombstones for fire hydrants . The reinforcing rods in them are much more durable than the concrete which seems a poor quality mix. Back to the accumulator, definitely a good job if it works. Always put the pto out and stop the tractor after holding the lever in the lower position for about ten seconds to void the system of pressure when turning the tap on/off. Be careful working around the accumulator as it can store high pressure oil for a long time and potentially cause an injection type injury long after the machine has been in use.
    Thank you for pointing out that important safety advice.

  5. #5
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    Re: fisher humphries hedge cutter

    Thanks very much folks for your information and safety advice.

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