Blog

Engine

Model

BF4L1011F

Power

52 kw (70hp)

Displacement

2730 cm³

Rated speed

2500 rpm

Cooling system

integrated oil cooling

Fuel consumption

7-10 litres per hour

 

 

 

The fuel system is protected against

○ Contaminated fuel and water by a settling tank and primary and secondary fuel filters
○ The combustion air is filtered using four filtering systems
○ The engine has over-speed protection


MPD – Maximum Power Distribution System

DTW has chosen not to compete in the medium size machine market but to keep its niche as the lightest (3400kg) and least expensive vegetation clearance machine on the world market.  

Rather than increasing power and size, DTW has chosen to develop its MK 7 as a more  “intelligent”  machine which fully utilizes total available engine power throughout the cutting process, regardless of cutting conditions, in order to improve cutting rates.

Earlier versions of the Tempest have used a feedback system which keeps constant load on the flail head. This constant load is achieved by increasing and decreasing track speed. If the flail head is lightly loaded, the machine ground speeds will automatically increase to increase the load on the flail.  In turn, power to the head will rise until a set limit is reached.

Although effective, the earlier systems did not use all the engine power all the time.  That’s where the Mk7 differs from its predecessors.  The MK 7 has been designed to take the power not used by the tracks and to transfer that unused track power to the flail head – the “Maximum Power Distribution” (MPD) system.

 

Hydraulics

Triple hydraulic pumps: variable displacement axial piston type supplying the /arms.  External gear type supplying the flail and hydraulic cooling fan. A feedback loop between the flail circuit and track circuit provides automatic power sharing between the two systems to give optimum forward speed for cutting in varying vegetation density.

The rams supporting the arms on Tempest have a constant supply of pressurized oil from an accumulator. This allows the hydraulic system to take most of the weight of any attachments fitted to the front of the machine. This in turn minimizes the down-pressure of the attachment on the ground. This ‘assisted float’ facility allows attachments to follow ground undulations easily, without digging in.
There is 10 µm filtration on the return line to tank, using a magnetic separator.

 
Electrical System

Easily accessible modular system which is shock-mounted and designed for easy fault identification. Dedicated key start electrical system in case radio control breaks down.

 

Remote Control

The digital radio-controlled handset has 9 off/on channels and 4 proportional channels with multi functional capabilities and an operating range of over 400 meters.

A digital safety signal insures the Tempest enters a safe standby mode in the event of interference or signal failure.  The handset has a low-battery indicator.

Most importantly, the Tempest can be controlled manually if an electrical problem should occur.

 

Instrumentation

Gauges:        
Engine rpm 
Engine temperature
Engine oil pressure
Fuel level
                             
Alarms:         
High hydraulic oil temperature alarm
High engine temperature alarm 
Low engine oil pressure alarm
Low fuel alarm
                          
Indicators:    
Hydraulic oil level 
Hydraulic oil temperature 
Hydraulic filter condition 
Combustion air intake blockage

Chassis/ Hull

A heavy duty ‘V’-shaped robust hull is designed to protect valuable items within the hull. The hull is constructed using 8mm steel plate with a 5mm thick steel box section cage for added strength.  The central roof sections are removable, giving excellent access to major items.