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      Cereals event guide 2025 available now

      By Matthew TiltJune 20, 2025
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    Machinery

    Trailed post driver brings hammer muscle to small or elderly tractors

    John SwireBy John SwireSeptember 24, 20183 Mins Read
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    The latest innovation in fencing equipment from Bryce Suma is a high output heavy-duty post driver that can be operated by a tractor of modest size and weight.

    Jock Bryce of the Kelso-based manufacturer points out that normally, Suma heavy-duty post drivers carried on the rear three-point hitch need a substantial tractor to maintain secure stability on site and during road travel.

    “But not everyone has need of a 120-150hp tractor, so our new Suma TR400 is a trailed design that can be operated by a small tractor, whether new or quite elderly,” he explains. “As long as the tractor can summon up a 25-30 litres/min oil supply to operate the 400kg hammer at a sensible speed, then that’s all you need.”

    The Suma TR400 has all the performance and operating features of a top-end tractor-mounted post driver but with the added benefit of storage space for up to 20 strainer posts, 100 round or square fencing stakes or eight to 10 rolls of 100m net, plus barbed or plain wire.

    The chassis houses a secure container for a chainsaw and other hand tools, there are tool trays for fencing gear on the drawbar and adjacent to the hydraulic controls, and vertical slots for storing wooden support blocks to place beneath the two stabilising hydraulic jacks.

    These extend from the frame by the offside wheel and from the bottom of the mast as part of a package of hydraulic features that also provide mast side-shift and two-way vertical alignment.

    Back-shift and side-shift enable the operator to precisely position the mast for driving fence posts or the patented integral hydraulic swing-around rock spike.

    In addition, the drawbar design allows the chassis to be ‘jack-knifed’ at up to 90 degrees to the tractor to get into tight or awkward corners and wheels set out wide with large flotation tyres provide good stability and flotation on soft ground.

    As on all Bryce Suma post drivers, the mast on the new TR400 is a two-stage telescopic design that provides 3.6m of hammer drop to strike the steel cap that holds and protects the post.

    “The unique and patented auto tele mast provides the operator with a choice of any length of hammer stroke without having to make any adjustments to the mast itself,” explains Mr Bryce.

    “It also reduces overall height to avoid overhead cables or branches when working amongst trees, and also for transport when the mast is set at an angle to further reduce overall height and bring the weight inwards.”

    Other patented features include a greasing arrangement that allows both sides of the telescopic mast to be lubricated without the operator having to clamber on to the machine’s frame.

    Bryce Suma has tested the new machine on a modern 47hp utility tractor, a regular 60hp farm tractor and on elderly two- and four-wheel drive tractors, which can be fitted with an auxiliary tank and pto-driven hydraulic pump if their built-in hydraulic system is inadequate.

    Jock Bryce comments: “This new post driver will suit a professional operator who wants the benefits of the TR400’s storage capacity in addition to its top-notch performance or someone wanting to upgrade to a high-output machine but does not have the budget for a big tractor to go with it.”

     

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    John Swire

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