PRONAR Tandem-Miststreuer 20 t, 14 m³, Streubreite bis 25 m

Standard equipment

• Tandem chassis with rigid axles and parabolic suspension, axle spacing 1,360 mm
• Horizontal spreading adapter with 2 rollers
• Spreading adapter with two metering screw-shaped drums with bolted-on blades and two wide-spreading discs, each with four bolted-on blades
• Body, front wall with perforated viewing window
• Front splash guard grille
• Reinforced hydraulic tailgate with height indicator
• Hydraulically operated protective flap
• Rubber lining inside the tailgate
• Conveyor system with four 14 mm quality steel chains, hydraulic drive and infinitely variable speed control
• Single-line lubrication system for the spreading mechanism bearings
• Rigid drawbar with overrun hitch, rigid towing eye Ø 40
• Hydraulic support leg
• Dual-line compressed-air brakes, drum brakes 406 × 120 mm
• Handbrake
• Control via the tractor's hydraulic spool valve
• 12 V lighting system
• Folding access ladder and steps
• Metal covers over the wheels
• Wheel chocks with holder
• Paint finish: body, drawbar and axles green RAL 6010; adapter, mudguards, protective grille, tailgate and protective flap black grey RAL 7021

Technical data

Note: All listed parameters apply to individual approval in Germany. Additional hydraulic connections are required for the tailgate, protective flap and controls.

Product description

Manure spreader with wide-spreading system and 14 m³ capacity

The sprung tandem carries 12.800 kg and spreads up to 25 m wide. Two horizontal metering rollers feed the material to two spreading discs, while four conveyor chains with infinitely variable control move it forward.

25 m spreading width – the key feature of this spreader

That is more than twice the width of spreaders with vertical rollers.

How the system works: Two metering screw-shaped drums with bolted-on blades break up the material and feed it to two wide-spreading discs, each with four blades. These spreading discs throw the material out to the sides.

The benefits of the wide working width:

• Half as many passes. At a working width of 25 m instead of 12 m, the number of wheelings across the field is halved.
• Less soil compaction. Every pass avoided protects the subsoil – an effect that lasts for years.
• Faster spreading. Every load counts, especially with compost and digestate applied at high rates per hectare.
• Matches tramline widths. If you work with a 24 or 27 m spraying width, you can use the existing tramlines.

Horizontal rather than vertical – the choice

Rule of thumb: Vertical rollers engage the full loading height and handle long-straw, matted farmyard manure better. Horizontal rollers with spreading discs distribute material further and more evenly – they are best suited to compost, digestate, poultry manure and well-rotted material.

14 m³ with a payload of 12,8 tonnes

This gives a calculated limit of around 0,91 t/m³.

What this means: With compost (0,6 – 0,9 t/m³) and well-rotted manure, volume and payload are reached at roughly the same time – the capacity is ideally suited to the target material. With very wet, heavy material, the payload limit is reached first.

Four conveyor chains with infinitely variable control

The hydraulically driven chain floor can be adjusted continuously. This is the actual rate control: the faster the floor moves, the more material reaches the rollers per metre.

Four chains instead of two pull evenly across the full floor width – with a 5,6 m body length and sticky compost, this is the difference between an even flow and material left behind in the middle.

Tailgate with height indicator

The reinforced tailgate is hydraulically operated as standard and has a height indicator.

Why the indicator is the key metering aid: The opening height, together with the feed speed, determines how much material reaches the rollers. Without an indicator, adjustment is a matter of guesswork and cannot be repeated on the next job – with an indicator, the setting can be reproduced and recorded for fertiliser planning.

Hydraulic protective flap and rubber lining

• The protective flap is hydraulically operated and prevents material from falling out during transport.
• The rubber lining inside the tailgate cushions the flow of material and prevents manure from becoming trapped between the flap and frame.

Single-line lubrication system

It centrally lubricates the bearings of the spreading mechanism. Spreading mechanism bearings operate in dust, moisture and aggressive salts – regular lubrication determines their service life and they are otherwise difficult to access on the machine.

Control options

When is ISOBUS worthwhile? When spreading by prescription map and documenting application rates is required – a practical way to meet nutrient accounting requirements under fertiliser regulations.

Deflector to limit spreading width

Available as optional equipment. With a spreading width of 25 m, it is effectively essential: without it, the fertiliser regulations' buffer requirements for watercourses and field margins cannot be met.

Trailing axle as an option

The rear trailing axle with hydraulic lock reduces the turning circle and protects the grass sward. Please note: With this axle, the vehicle is over 2.550 mm wide and requires additional hydraulic connections.

Approval

The EU version also includes warning boards at the front and rear, as well as a lock on the towing eye to prevent unauthorised use.

Additional equipment

• AT or EU type approval, including documents
• Rigid drawbar for lower hitching (no extra charge)
• K80 towing eye
• Dual-line compressed-air brakes with ALB
• Rear trailing axle with hydraulic lock
• Lever control for belt feed, slide gate, flap and support leg
• Electro-hydraulic belt feed control
• BASIC or FULL rate control system
• ISOBUS data transfer system, with or without control panel
• PTO shafts and wide-angle PTO shafts in various versions
• Deflector to limit spreading width
• Side underrun protection
• Rear underrun protection, approved and foldable
• Spare wheel, warning triangle

Applications

Arable farms with large fields, agricultural contractors, compost spreading, biogas plants spreading digestate, poultry farms, agricultural merchants and recycling businesses, local authorities.

Operating notes

• Maintain a PTO speed of 1.000 rpm.
• Check the towing vehicle's drawbar load: up to 2.200 kg.
• Ensure there are sufficient hydraulic connections – the tailgate, protective flap and controls require additional connections.
• Check the spreading width with the actual material before the first load – it depends greatly on moisture and texture.
• Plan and document application rates in accordance with fertiliser regulations; record the tailgate height and feed speed.
• Observe buffer distances from watercourses and field margins – the deflector is designed for this purpose.
• Never climb into the body or work on the adapter while the PTO is running.
• Before working on the spreading mechanism, disengage the PTO, stop the engine and wait for all parts to come to a standstill.
• Keep people clear of the area around the discs – material is thrown out at high speed.
• Top up the lubrication system regularly and check that it is working.
• Check the chains for tension and wear.
• Clean after use – salts in manure promote corrosion.
• When travelling on the road, take account of the 3.740 mm height.

Frequently asked questions

How wide does the spreader spread?

Up to 25 m. Two metering drums feed the material to two spreading discs, which throw it out to the sides.

What is the spreader's capacity?

14 m³ with a payload of 12.800 kg and a permissible gross weight of 20.000 kg. For on-farm use, a technical gross weight of 21.200 kg is permitted.

How does it differ from a spreader with vertical rollers?

The spreading width: 25 m instead of around 12 m. Vertical rollers are better suited to long-straw, matted farmyard manure, while horizontal rollers with spreading discs excel with compost, digestate and well-rotted material.

Is the volume matched to the payload?

With compost and well-rotted manure, both limits are reached at roughly the same time – the capacity is ideally suited to the target material. With very wet, heavy material, the payload limit is reached first.

How do I set the application rate?

By adjusting the chain floor's infinitely variable feed speed and the opening height of the hydraulic tailgate. The height indicator makes it possible to reproduce a proven setting.

Do I need the deflector?

With a spreading width of 25 m, practically yes – without it, it is difficult to meet the fertiliser regulations' buffer requirements for watercourses and field margins.

Which control system should I choose?

As standard, everything is controlled via the tractor's spool valve. BASIC provides a control panel for feed and the slide gate; FULL also includes the flap and work lights. ISOBUS is the choice for prescription spreading with documentation.

What tractor do I need?

147,4 PS or 108,3 kW, a PTO running at 1.000 rpm, a hitch rated for a 2.200 kg drawbar load and several hydraulic connections.