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.
|Hammer Size||Serial Numbers and Date|
|Onshore Hammers||Offshore Hammers|
|#1||See Note 1||–|
|06||See Note 2||–|
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:
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:
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. Below are some photos of the Vari-Cycle mechanism.