A gearbox and PTO designed for use with diesel engines will not work as well with a hydraulic prime mover, for example. The type of prime mover must be considered carefully when selecting a PTO. Make sure to choose the right gearbox for a diesel, or petrol engine, or electric-powered or hydraulic motor. Other factors to consider when selecting power take-o ffunits (PTOs). Beyond the six factors previously outlined, there are some other considerations that should be taken into account when selecting a gearbox or a power take-o ffunit of any kind – not just a pump drive. When selecting a PTO, the following things should be kept in mind. an appropriate PTO, this guide will help you determine factors such as Speed Limits ~ Side-Load Limits ~ Clutch Torque Limits. » Type of prime mover. » Inertia of the machine to be driven. A high-inertia machine will typically put more stress on a gearbox, due to the heavy torque loads and weight applied to the unit during each rotation. The heavier the pump or other machine is, the more robust the gearbox will have to be. Special bearings and housing designs may be required to accommodate these high loads on the input shaft. This guide is a helpful resource for analysing inertia, engine type, horsepower, and more. » Peak torque requirements. Care should be taken not to undersize or oversize a gearbox. Using power take-offs that are too large – or small – for a particular task will result in higher strain and efficiency losses. » Number of clutch engagements/hour and duration of each engagement. More durable units are required for use in applications such as heavy-duty pumping, milling, and other activities which require fast, repeated clutch engagement every hour. » Splitter design. » Splitter requirements. Split the output or dual drive input? #DriveLineHarmony www.jbj.co.uk How to select the right pump drive for an application ~ learning the basics. Dual drive inputs AM220 1:1 ratio with 2 hydraulic clutches Electric Motor Hydraulic Motor Driven Equipment e.g. Drive Shaft or Hydraulic Pump In some cases, a single power take-off may not be the right choice for a particular application, and multiple power take-offs can be used to provide maximum efficiency, and minimise equipment redundancy. Splitter gearboxes, or multiple power take-offs, allow for a single prime mover to drive multiple pieces of equipment such as pumps. Reversing the idea they can be designed to accept inputs from multiple prime movers, and output to a single application, creating a dual drive input. Splitter gearbox selection is defined by all of the above statements but care should also be taken to ensure that the unit has a suitable distance between output centre lines to ensure space for pump oil feed connections. It should also be noted that by selecting a speed increasing ratio within the splitter may allow for the selection of smaller capacity pumps that will still ensure that the flow capacities of the drive are met. Due to potential overhung loads exerted upon the gearbox input mounting flange, it may be necessary to fit stirrup mounts to the sides of the gearbox, see jbj Techniques’ Pump Drive catalogue for details. When selecting either a single pump drive or a multiple power take-off, each of these factors must be considered. Failing to choose the right unit will lead to poor performance and an inefficient design, so ensure that you do your due diligence, and refer to all available resources, such as
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