Greenmech Arborist 19-28

Another British-built machine, the 19-28 is strong on looks, has power to spare and is packed with innovation and clever ideas. And it's built to last.

The 19-28 is classed as a 7.5" machine but it will do considerably more. Yes, the throat opening is 190mm (7.5") high but it is 280mm wide, hence “28”. Don’t make the mistake of thinking it means 28hp.
The new-sized throat opening catapults the machine into a class of its own and, backed by a powerful four-cylinder 50hp Isuzu water-cooled diesel engine, gives it an outstanding appetite.
“It’s capable of taking big material and has loads of grunt. You don’t have to prepare the wood so much, which saves lots of time. It easily drags in brashy material and conifer,” says one tester.
The 19-28 comes on its own chassis with an adjustable tow bar so it should always satisfy health and safety requirements whether it is behind a pick-up or a seven-tonner. But it’s the tailgate at the rear that catches our eye.
Folded against the hopper, the tailgate displays multi-volt LED lights for road travel and converts the feed table into a transport box for carrying road signs. Folded down for work, the tailgate protects the light assemblies and acts as a barrier to prevent material being lost under the chipper.
“The tailgate is an excellent design. It stops a lot of brash and rubbish going under the machine, so you don’t have to waste time shutting the machine down to clear it out,” a tester points out.
Starting the machine is simple. The starter box has a pre-heat circuit that automatically counts down into pre-start mode. It also has day-hours and operational-time recorders. But the gem is the diagnostics circuit. If the machine shuts down, it will tell you why.
“It’s good that a chipper of this size can identify faults straight away. Usually it’s a puff of black smoke and a scratch of the chin, but this feature means you don’t waste time looking for the fault or describing it to the dealer. The fault number means you can get on with ordering the appropriate part,” says a reviewer.
The unit is fitted with an electric throttle so when it is running in tick-over it’s simply a case of pressing the button, and away it goes to full speed. As the throttle isn’t likely to vibrate down, this chipper will stay at full speed until reset. And there’s no clutch. It has a self-adjusting spring mechanism so it is permanently engaged. The feed rollers on this machine look positively threatening.
One of our testers is impressed with its power. He says: “It’s amazing that you can have this kind of power and manoeuvrability and still hitch it to a vehicle for towing.” There are two front handles to help an operator lug the machine into a safe work position.
As we expect, Greenmech has incorporated its round “Disc Blades” into this model. The discs are mounted onto a flywheel and are fully sharpened around the circumference. Only one-third of the cutting surface is used at one time and the blades are simply rotated when a sharper edge is required. Two bolts give access to the blades for checking while a couple more bolts give access through the sidewall if the blades need rotating.
Our panel prefers push-button controls, so the testers are disappointed that Greenmech has done away with electrical controls on the 19-28 and made it purely mechanical. However, this means that there is less to damage. Operation is from the bar that runs over the top and down the sides of the hopper — this chipper’s feed table is less than 600mm from the ground so a “top and side” bar is appropriate. In this position we experienced no problems of false tripping.
The bar has three positions. Middle position is feed-in and this is where the bar automatically centralises. Pull the bar forward and reverse feed is engaged; push it back and it locks and stops the machine, requiring a conscious decision to release it to resume work. “It’s fiddly having to reach round the side and unhook it to bring it forward again,” says a tester.
He is also concerned that the engine is mounted low to the ground. He says: “I would like to see a bit more ground clearance. I think I would be nervous of hitting a stump when driving down rough tracks.”

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