The ILDT and PSD Transmissions are designed to provide a cost effective yet simple solution for dynamic phase positioning and product synchronization applications.


Used to advance or retard the timing of a mechanical operation, both the ILDT (In-Line Differential Transmission) and PSD (Phase Shiting Differential) Transmissions are used primarily in conveyor drives, converting machinery and web cut-off applications. Designed to provide zero reference type corrections, phase corrections are made only when the correction shaft is adjusted.  Unlike other phase shifting differentials on the market, all EMP models allow dynamic corrections while running or stopped. The correction may be achieved manually or automatically when using an EMP Register System.

THe ILDT Series offers a 1:2 or 2:1 input - output shaft ratio with the main shaft rotating in the same direction. A choice of 2.5 and 4.5 HP units are available.

The PSD Series offers a 1:1 input - output shaft ratio with the main shaft opposite direction. 

Applications include:

  • Packaging Machinery
  • Conveyor Drives
  • Converting Machinery
  • Phasing Applications
  • In-Motion Timing Adjustments
  • Plastic or Film Web Control

For applications requiring variable speed control in addition to phase corrections, see the Double Differential Transmission. 

Refer to the Ordering Information file within the Downloads section to determine Part Numbers. 


Our transmissions are popular for phase positioning and product synchronization applications because of features such as:

  • Infinitely Adjustable - Go thru 360° and keep going!
  • Dynamic Corrections Can Be Made While Running or Stopped
  • Zero Reference Type Correction
  • Manual or Automatic Correction
  • Choice of Correction Ratios
  • Choice of 1:1 or 2:1 Main Shaft Ratio
  • Available in 2.5 or 4.5 HP Models
  • Available in Metric Sizes
  • Available in Stainless Steel Hard Coat Housing
  • Easy Installation


The ILDT and PSD assembly consists of around an extremely durable 20° miter gear setup.


ILDT & PSD Ordering Information
Download File - 240.63 KB
ILDT & PSD Technical Data & Dimensions
Download File - 1.80 MB
ILDT-2 Differential Dimensions
Download File - 26.38 KB
ILDT-2 Operating and Maintenance Manual
Download File - 1.27 MB
ILDT-4 Differential Dimensions
Download File - 32.69 KB
ILDT-4 Operating and Maintenance Manual
Download File - 1.26 MB
PSD-2 Parts List
Download File - 127.77 KB