A. External shrink-disk bushing. For this configuration, Candy must extend the length of the hollow inner shaft to accommodate the bushing. The shrink-disk bushing is placed over the outer diameter of the hollow shaft and the HDD is then placed over the end of the machine shaft. By tightening the locking screws, the bushing clamps down on the hollow shaft and the machine shaft, thus securing the connection.


B. Internal compression type bushing. The bushing is inserted into the bore of the hollow inner shaft and then the HDD and bushing are placed over the end of the machine shaft. By tightening the locking screws, the bushing expands into the hollow shaft while at the same time clamps down on the machine shaft.

Candy also recommends the use of a suitable support bracket secured to the machine frame. This bracket serves several purposes, the most important of which is to secure the HDD axially to the machine. The bracket may also be used to secure the grounding plate and a control motor or locking knob assembly.

When installing the support bracket it is imperative that the HDD assembly is aligned correctly. Misalignment caused by improper installation may damage the differential.

If the described mounting methods are not suitable for your application, please consult the factory for alternative mounting suggestions.

Installation :

The Candy HDD is simple to install making this series ideal for machine retrofits as well as new machine designs. The following illustrations may serve as a guide for designing phase or speed control into your machine.

1. Remove the existing gear or pulley from the machine shaft journal or for a new design, purchase the appropriate gear or pulley.

2. Open the bore of the gear or pulley to fit over the pilot diameter (dimension D) on the outer housing of the HDD. After the bore is opened, add mounting holes to the gear or pulley in order to secure it to the HDD's outer housing.

3. Mount the remachined gear or pulley to HDD's outer housing using the tapped holes that are provided on each HDD unit (dimension W-BCD).

4. The differential and gear are now ready to be mounted on the end of the machine shaft. Please refer to the previous section for preferred mounting methods.

After the HDD is mounted on the machine shaft, it is important to secure the unit axially with a support bracket. Most brackets are simple "L" type arms which may be anchored to the machine side frame. The grounding plate of the HDD has six holes (dimension Y-BCD), three of which are tapped making them a suitable attachment for the support bracket

Candy Manufacturing can assist you with conversions or new machine designs. Our services include:
• Running torque and inertia calculations
• Providing alternative mounting suggestions
• Machining and mounting gears or pulleys
• Supplying shaft bushings