Morey confirms, "Almost all chippers found at rental companies will be hydraulic feed. [It] significantly enhances the productivity of the chipper. Hydraulic components found on these chippers allow them to effectively process larger quantities and diameters, and make them more efficient to operate."
"The hydraulic feed rollers can manipulate the material being fed, so maximum horsepower can be utilized during the process," Roorda explains. "Vermeer chippers utilize a SmartFeed system that monitors engine rpm and hydraulic system pressures to efficiently chip material. For example, if a large diameter, long log is fed into a chipper, the hydraulic feed rollers will stop feeding whenever the engine rpm drops below a specified level."
In the case of hydraulic system pressure, if the pressure increases to a specified level ? for example, due to a fork in the material ? the system will back the material up and rotate it until it is successfully sent to the chipper drum. "Of course, there is a possibility that the sheer size of the material is too big for the opening of the chipper drum," says Roorda. "In cases like these, the hydraulic pressure sensors reduce any potential heat buildup within the system that can damage components."
As a pioneer in hydraulic feed systems, Morbark can attest to their benefits. They are safer to operate, can handle larger diameter material and with today's technology, such as reversing auto feed, the feed is controlled and the engine works at its maximum efficiency at all times. Hydraulic fed chippers with auto feed are also well suited for any operator experience level.
Another feature to look for when renting chippers is sound attenuation. In today's work environment, noise pollution is taking on increasing significance. "Sound is becoming more of an issue in the U.S.," says Smith. "Some chippers have a lower sound output than others."
For example, Vermeer chippers have options available to help reduce sound outputs, Roorda notes. Options depend on the jobsite and/or customer requirements.
Smith advises, "Look for sound-deadening curtains, engine isolators, rhino coating and other unique features to see what sound-reduction features are built in... Consult your RSC representative to understand sound ratings and the benefits of lower ratings."
Ease of operation is also an important consideration when renting. "A number of manufacturers have developed models that are intentionally easy to use for inexperienced operators," says Frazao.
"With chippers, as with most rentals, it can be advantageous to rent from a company like United Rentals, where we offer multiple options within each equipment category," he adds. "It's far easier to find a chipper that exactly suits your needs and experience level."