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Vulcan Vari-Cycle (Stroke Control) is available for all Vulcan Single Acting Hammers having a cylinder which has as an integrally cast pad part thereof the necessary mounting pads for installation of the Vari-Cycle equipment. Shown in the table below are the first Serial Number and date of those hammers (by size) having Vari-Cycle factory installed or mounting pads for field retrofit.

All Hammers having Serial Numbers subsequent to those above are configured as to accommodate Vari-Cycle.

Note 1 -- The following Size #1 Hammers are equipped with mounting pads for Vari-Cycle:

GC-8455/GC-8555/GC-8595/GC-8715/GC-8765

Vari-Cycle mounting pads on this size Hammer were discontinued 8-23-74.

Note 2 -- The following Size 06 Hammers are equipped with mounting pads for Vari-Cycle:

GD-8750/GD-8740/GD-8825/GD-8605/GC-8605/GC-8685

Van-Cycle mounting pads on this size Hammer were discontinued 7-24-74

Note: This tip obviously does not cover the hammers later than the mid-1970's, especially the onshore 5' stroke hammers. Their situation is complicated; you can contact us to ask questions about this. All of the Vulcan 5100, 5110, 5150 and 6300 hammers can accommodate Vari-Cycle and indeed virtually all offshore hammers from the 1970's onward were either equipped with Vari-Cycle or Traverse Trip. Click here for photos of the Vari-Cycle mechanism.