Effluent feature: HiSpec TD-R 4000

By: Mark Fouhy

The Irish-built HiSpec range of machinery has a well-established reputation, both globally and also with Kiwi farmers and contractors

A nice even spread pattern through the splash plate

Thoughtful design and superior build quality put the HiSpec range of slurry tankers in a class of its own. With a capacity spanning from 3600 litres to 20,400 litres, all HiSpec tankers use a unique low profile spreading system, with the downward direction plate increasing controllability, and also decreasing air pollution and unpleasant smells.

With slurry becoming of increasing priority on New Zealand farms, Giltrap Agrizone has quickly recognised the many benefits a quality brand such as HiSpec offers and is the New Zealand distributor for the innovative brand.

All systems are controlled electronically

Founded more than 25 years ago, HiSpec produces an impressive range of equipment for the agriculture sector, from muck spreaders, diet feeders, slurry tankers, and even a Kompactor multi-purpose trailer.

The controller covers the functions well in a simple design and format

We managed to spend some time with a HiSpec TD-R 4000 in action in Whakatane at Grant Farms. The 4000 TD-R model is the largest in the TD-R category. The 4000 corresponds to the size — in this case — 4000 gallons (18,184 litres), and TD-R references the design and configuration of the taker. TD means a tandem axle and the R stands for recessed.

This configuration is most popular with large farmers and contractors, as it allows for greater capacities with its lower centre of gravity, making for smooth towing. This also keeps transport widths down and comes in handy in terms of manoeuvrability through tighter areas.

Manoeuvrability made easier with the steering axle

HiSpec has opted for a Jurop pump (another reputable brand, with a 46-year history of making pumps). This particular unit was fitted with a 14,000-litre pump over the standard 11,000-litre one to save time while filling, as more product can be transferred in a shorter time. This Jurop pump also features a hydraulic changeover valve, again helping improve overall efficiency and, in turn, reduce operator fatigue. If a few minutes a load is saved,
by the end of the day, that can equate to hours. Jurop pumps are known for their high quality along with requiring minimal maintenance. This equates to a long service life on investment.

HiSpec has anti-implosion rings in each section of the tank. Along with pressure relief valves, this means that implosion isn’t something to worry about. The tank is built out of six-millimetre-thick steel, helping spread the load and improve overall structural strength. This also proves vital when an attachment is added to the rear such as a dribble bar or trailing shoe.

Machine comes pre-plumbed for the addition of rear implements

Giltrap Agrizone recognises that changes are likely to happen in the effluent industry, therefore are bringing in the tankers premade and ready for all the extras to be added, if required. This includes mounts and all the hydraulic plumbing from the factory in a nice tidy way, which is far superior to a retrofitted system. Adding to the structural integrity are collared dished ends, which give a place for effluent attachments to be fitted, as they can clip onto them.

Indent ordering has many benefits over just the security of knowing exactly how the machine will come. In purchasing its tankers (two HiSpec tankers), Grant Farms was after an extra level of comforting and dampening than standard springs on the drawbar. Giltrap Agrizone was able to help with this, contacting the factory to replace the springs with hydraulic rams, along with an accumulator to add the dampening. This custom option has now made it into the optional extra bracket, available on all tankers.

Fill arm folds up out of the way

A feature also present in this unit is the turbo fill. Located at the end of the filler arm, a hydraulic motor runs a propeller to increase the speed of the slurry to the tank. It certainly makes a difference, as when activated, you can feel and see extra product rapidly filling the tank.


We hooked the HiSpec TD-R 4000 to a Case IH Optum 270. With ground conditions damp from recent rain, I was sceptical about how getting around the paddocks would go. The short trip on the road proved how smoothly these tankers tow. On the road empty, the Case IH Optum wasn’t hesitant either, easily pulling up to speed. Loading was simple with the fill arm and the addition of turbo fill speeds up the process. The sight glass on the front gives a good indication of what’s going on inside the tank.

Sight glass for easy assessment of levels

The trip to the paddock was comfortable with sprung axles and hydraulic drawbar suspension, absorbing harsh bumps along the way. Manoeuvrability into each paddock and around the farms was surprisingly easy for such a large set-up, helped by the steering axle.
The large 750/60R30.5 tyres lift the axle pivot point up and reduce the amount of travel needed compared to a smaller tyre. They also didn’t mark the paddocks much either, which is notable considering how many tonnes of machine is travelling across, especially after the amount of recent rain. The inverted splash plate did a great job of evenly spreading the slurry. A stone trap at the bottom of the tank helps keep stones out of the discharge nozzle, while a pressure gauge on the front shows how much positive or negative pressure is on the tank while filling and discharging.

Straightforward DigiDevice controller

HiSpec tankers run a Digistar controller and system. The hydraulics are pumped to a large valve block found on the front left of the tanker. Ten electric valves each control a separate function and are well protected under a steel cover. The controller covers the functions well in a simple design and format. Set up with a filling menu and an emptying menu made overall control of the tanker easy.

Two sets of individually sprung axles sit underneath the HiSpec 4000. The front and rear axles each have their own set of springs, making the tanker impressively stable and able to handle rough ground well. This tanker was spec’d with air and hydraulic brakes to suit the air brakes Grant Farms run on their Case IH Optums. All four wheels are braked through a load-sensing brake valve.

Maximising efficiency with eight-inch autofill fitted with turbofill

The load of the tanker determines how much pressure is applied to the brakes.
If it’s empty, it won’t lock the wheels up and be touchy, and when full, it provides the optimal amount of braking force.

As expected, both axles are 10 stud commercial axles, which have the durability to serve many years.

Consistent application and minimal soil impact

Daily maintenance of moving parts and axles are kept simple through a single central greasing port.

The Irish-built HiSpec TD-R 4000 is a high-capacity tanker with the right amount of technology intertwined to make it a simple machine to operate while staying reliable.

For more information on the HiSpec range, visit Giltrap AgriZone’s website gaz.co.nz

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