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Text version of the page
Variable Speed Drives
C and Z Mounting Typical Hexadrive Fixed Center Drive Easy Removal Kit
Hexadrive Series
Overview
The typical Hexadrive fixed center drive consists of an adjustable pulley mounted on the motor shaft, a spring-loaded pulley on the driven shaft, a variable speed belt and a torque arm bracket. This bracket prevents the manual pulley handwheel from spinning, so speed can be changed while the motor is running. The spring-loaded driven pulley compensates for belt slack or tightening when the adjustable pulley is opened or closed. Much of the driven speed range will be greater than motor speed. It is important to know the mounting configuration when designing a Hexadrive fixed center drive or selecting a replacement pulley. There are two basic styles, designated as “C” and “Z” mountings. The adjustable pulley is the same for either, but the driven spring-loaded pulley is different. The drive selection tables that follow in this catalog indicate which model to use in either case.The standard adjustable pulley is the “HM” series, with a handwheel control. There are two variations which give the option of speed change by electric remote control (“HEC” series) or by using an external linear actuator (“HLA” series).
Easy Removal Feature
All Hexadrive spring-loaded pulleys are designed with an easy removal feature, which minimizes the chance of damage to the pulley or shaft. This damage can result from hammering and prying on the pulley. While this feature is built into the smaller pulleys, all 5 HP and larger pulleys require the use of our Easy Removal Kit accessory because they feature “through bores.” The kit consists of a special nut and retaining ring that fit into the counterbore end of the pulley, retaining ring pliers, and a threaded puller rod. Two types of kits are available – the table below shows the correct kit for each pulley model.
UPC NumberEasy Removal KitModel NumberFor Pulley Model Number685144 20723 030880H12904, 12905, 12907, 22904, 22905, 22907, 32904, 32905 685144 20726 020979H13207, 13210, 13220, 13230, 23207, 23210, 23220, 23230, 14407, 14410, 14420, 14430, 24407, 24410, 24420, 24430, 34407, 34410, 34420VSD