Traffic brings additional risks to working roadside. Being able to turn the feed table to a safe loading position is essential. And with the 250DH you can do just that. But unlike most other turntable machines, this one doesn’t stop at 270? or even 300?. The turntable on this unit is not mounted on a central pivot. Instead it runs on rollers on a ring. Pull a lever and the turntable glides through a full 360?. Locating notches on the ring give you the exact position you want.
This woodchipper has a huge funnel — and that means reduced snedding. As soon as the tree is down you can start feeding with minimum time spent on preparing the timber. The funnel has two safety bars. One runs round the bottom of the funnel and three-quarters of the way up the sides. A separate bar covers the top of the funnel. Control positions are on each side and buttons are colour-coded — green for feed in and blue for reverse.
The chassis is sturdy. It’s a twin axle and has a clever, self-levelling tow hitch. Now that is luxury. And while the machine is substantial, with meaty parts that ooze strength and muscle, the whole has been put together to give a reasonably compact unit. Well, compact for something this brutish.
We take a look at the heart of the chipper. There’s a screen or guard over the air filter and the fuel tank swings out to give access to the rollers and flywheel. Everything is easy to reach. And everything is massive — massive flywheel, massive bearings, massive shaft. There are four double-sided, reversible, 150mm knives. Power comes from a Kubota 90hp turbo-charged diesel engine. It’s awesome. This machine has a manufacturer-measured throughput of 12 tonnes per hour.
But we need to put it to work. Towing the unit down the track — by now muddy — gives us an indication of the weight. In total, this chipper weighs in at 2,180kg. It takes the loan of a four-wheel drive to pull it to the site and a hefty Aebi to pull it out when we’ve finished. But you are getting a lot of machine for the weight and it is most likely to be used for street tree maintenance, on the hard shoulder of motorways and other locations with hard surfaces.
The chipper’s power is felt as soon as you switch on. This one boasts a speed of 2,200rpm — hence the big engine — and it’s a constant speed. Concentrate on the engine and you can hear the constant revs in the background. The anti-stress kicks in to manage a log: grunt, grunt, grunt. The chips — larger than those produced by the other machines — fly out with such force that the end of the chute is pushed out of position.
Another log goes in, followed by conifer brash.
But the engine won’t restart and we have to tow the machine away.
Had we looked over the machine, we might have found the reason for it not firing up again. Back at the factory, Timberwolf’s service team are quick to find the problem — a terminal on the safety switch was loose and that killed the throttle. There was no defect as such. But, of course, it had to happen in a HW machinery review.
Have you registered with us yet?
Register now to enjoy more articles and free email bulletinsSign up now