The waste industry is undergoing a major change with regard to the packer’s hydraulic system. Such systems have evolved from simple gear pumps to packages including integral valve systems, load sense controls and, more recently, low speed operation and electronics. The method to drive these pumps is also changing.
When Allison Transmission released its World Transmission Series it quickly became the industry standard. The advantages of the automatic transmissions were readily apparent. Full-time engine power was now available from the Power Take-off (PTO), potentially saving the cost of extended front-end components for engine driven pumps.
The only problem was that the waste pumps had grown too large to mount between the engine and transmission. The solution was to develop an enclosed shaft extension for the PTO and move the pump mount to the rear of the transmission.
In 1994 the first prototypes were installed on waste hauling trucks. While the concept was readily embraced by some, several haulers were initially hesitant to make the change. However, with the realization that new emissions regulations might eliminate the possibility for front crankshaft pump drives on some chassis the PTO shaft extension soon gained popularity.
In addition to saving costs at the front of the chassis, Muncie, Indiana-based Muncie Power Products, Inc.’s patented PTO shaft extension require shorter hose lengths to simplify pump installation to further reduce costs. Mounting the pump closer to the reservoir also improves pump inlet conditions and reduces pressure drop in the hydraulic lines. Shaft extensions utilize aluminum main housings, steel mounting brackets and flanges. The shafts are supported by sealed ball bearings at each end.
Muncie and its dealer in Canada, Drive Products, Inc. in Toronto, Ontario, currently offer 30 versions. There are applications for continuous drive or clutch shift PTOs for both sides of the MD3000 series and the left side of the HD 4000 series transmissions. Output mounting options are varied. Heavy-duty clutch shift models are planned for later this year, as are HD top opening mounts. Current models are capable of up to 400 lb./ft. of output torque.
Allison is regularly consulted, as some restrictions for the equipment must be met. First, the shaft extensions may only be used in conjunction with a rear transmission support to the chassis. Second, the maximum weight of the installed pump must not exceed 115 lbs. (52.3 kg). Applications are not currently possible on transmissions incorporating retarders or integral oil coolers. Maintenance should consist of periodical lubrication the pump shaft splines.
Written by George Halleck, sales consultant at Muncie Power Products, Inc. in Muncie, Indiana.