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   Engineering Drawings: DS-3

DS- 3 Dynamic Slot Tensioner

Strong for its size, the DS-3 Dynamic Slotted tensioner allows continuous, adjustable pressure against the belt during the life of the drivetrain. Dynamic tensioners are often easier to install and improve drive serviceability in the field. Graduations on the mounting bracket allow predetermined loads to be applied during installation. And the tensioner can be locked statically into place if desired after the tension is set.

Operating Characteristics
Tensioner stroke - .25 inches (6.4 mm)
Range of adjustment - .50 inches (12.7 mm)
Maximum force against belt - 2.5 pounds (1.1 kg) continuous, 10 pounds (4.5 kg) peak

* Mounting Data:
     Approximate footprint without pulley of .95 inches (24.1 mm) wide by 2.1 inches (53.3 mm) length.
     Minimum clearance from mounting surface to bottom of pulley is .21 inches (5.3 mm) for self       lubricating pulley or ball bearings. Plastic sleeve bearings require .24 inches (6.1 mm) minimum       clearance.
     Requires one #6-32 threaded hole and one .125 by .50 slot. See drawing below.

If needed, mounting spacers are available from York for higher than standard belt clearances. See www.york-ind.com/spacers or contact York for details.
** Tensioner Height:
To determine tensioner maximum height, add total end to end pulley width desired + pulley clearance from mounting surface desired = X
     If X is less than or equal to .687 (17.4mm), tensioner height is 0.702 (17.8 mm)
     If X is greater than .687 (17.4mm), consult York Engineering for available optional shafts and       mounting bases.

York tensioners are designed to mount securely onto a flat surface with just a single screw. The tensioners allow minimal clearance between the belt and mounting surface. Tensioners also feature different shaft lengths so they are also adjustable by York to provide greater clearance heights if needed. The York website's Tensioner Configuration Tools automatically account for shaft changes, if needed, when they create the specific tensioner part number for your application. Where even greater belt clearances are needed, York can provide machined, anodized spacers to act as a raised tensioner mounting base. Spacers are available in custom thicknesses while standard catalog spacers .38 inches thick (9.7mm) for Size 4 and .25 inches (6.4mm) for Size 3 tensioners are always in stock at York. Spacers are shown below and fit within the same footprint as the tensioners themselves. The spacer part numbering system uses the last two digits of the part number to indicate the thickness in decimal inches, with a tolerance of +/- .01.