Selection Strategy

When your customers have to clear land for a project, trees and brush need to be taken care of fast and safely. Brush chipper manufacturers have developed various features and options that can help maximize productivity and safety while reducing labor costs during chipping.

The benefits of these features for your rental customers include reduced potential for injury and repetitive motion ailments. According to Rob Faber, commercial sales specialist at Morbark, the benefits for you, the rental business, include a possible reduction in insurance costs and liability concerns.

When selecting a chipper for your rental inventory, take a look at the following features that are available on some of today's brush chippers.

Automatic feed systems

Recently, systems have gotten "smarter" when it comes to drawing brush and limbs into a chipper. According to Faber, an automatic feed system, which is standard on Morbark machines, takes the guesswork away from the operator - there is less threat of stalling or overfeeding the machine.

"There are different styles of automatic feed systems, but most use rpm sensors," says Faber. "When a preset rpm is reached, the sensor will stop the feed wheels. Often, this is followed by a reverse action to clear the material. The operator doesn't have to stand next to a control bar to feed in material and monitor operations as closely now."

Bandit Industries offers the Auto Feed Plus on its 9- and 18-inch-diameter hand-fed chippers. This feature "is a symphony between the chipper and the feed wheels," says Leslie Kinnee.

"Our feed systems are set so the material is fed to the disc at the rate the chipper wants to chip it," explains Kinnee. "Because the hydraulic pump drives off the engine, as the engine rpm drops, so does the speed of the feed wheels. In this way, the feed system is always in harmony with the chipper."

Kinnee further notes that with this feed system, wood is never pushed against the disc, which can cause a braking action and can heat the disc and knives, prematurely dulling the knives. "Holding wood back from the disc will result in short cut material and can cause material to ball up in the infeed chute," she says. "These feed systems make the machines run smother with less vibration, reducing maintenance. They also ensure uniform chip size."

Vermeer brush chippers have features like the AutoFeed II system or SmartFeed. These patented feed-sensing control systems address predictability, or how quickly the engine loses rpm, rather than reacting based on a predetermined machine setting. The controller will only allow the engine rpm to drop slightly before stopping hydraulic flow to the feed rollers. Once they've stopped, if the engine doesn't return to full rpm within a set time, the roller will automatically reverse the material. This minimizes contact between the wood and the drum to relieve friction. It also allows the drum to return to full rpm as quickly as possible and resume automatic feeding - without operator involvement.

For small-diameter or loose, brushy material, the feature senses extended rpm loss time. It commands the engine to drop to a lower rpm while retaining maximum torque. This helps increase brush chipper productivity because it decreases the number of stops and starts while brushy material is processed. It also helps reduce the chance of self-feeding at a low rpm.

For increased operator safety around the infeed area, ANSI and OSHA set standards requiring the ability to quickly stop or reverse the device. Most manufacturers follow these standards.

Bandit also includes a patented last-chance pull stop cable as standard on its hand-fed chippers. It consists of two cables hanging about halfway between the hopper entrance and the feed wheels. If an operator incorrectly finds himself past the feed control bar and inside the hopper, he can use the cable to stop or reverse the feed wheels and wood flow.