Tag Archive for: Top Mast Drive

Cotta Transmission gearboxes are personally crafted to meet your requirements, and are some of the most reliable, durable, and powerful products available in the industry. Cotta works with each customer to discover their specific needs, uncover the power issue causing problems, and designs the best possible product to overcome the challenges that the application presents.

For example, Cotta designed a top mast drive from the ground up specifically for a customer’s blast hole drilling application. The bearing arrangement on the output shaft was designed to have as much downward force as upward force on the bearings, which is a very desirable feature for a blast hole top mast drive. A typical top head will have the bearing configuration on just one side so that all of the steel can be held up in the air with the appropriate amount of pressure on the bit while drilling. Cotta’s solution was designed with our customer to meet their unique requirements for pushing down or pulling up. The greater down force gives the end user the ability to drill the blast holes faster. Cotta’s custom top mast drive has proven to be a strong and reliable product for the customer for over 30 years.

Blast Hole Drilling Top Mast Drive

Cotta has over 2,000 existing product designs available, and an experienced engineering team that can take any new transmission application from concept to delivery at our production facility in Beloit, WI.

Cotta’s team just completed assembly and testing of these gearboxes, and is in the process of getting them ready to ship.  The units shown consist of two different split shaft PTO models, as well as a top mast drive.  Cotta gearboxes have proven to be one of the most most reliable, durable, and powerful products available in the industry. See below for more information:


Split Shaft PTO Gearbox

Split Shaft PTO


  • 1 to 1.02 PTO Drive
  • 1 to 1.02 Pump Pad

Max Input Speed:  2900 RPM

Max Torque:  1200 FT-LB Thru Gears

Thru Drive Torque: 12,500 ft-lb

Approximate Weight: 880 LBS


Split Shaft PTO Specialty Gearbox

Split Shaft PTO

Ratio:  1 to 1 PTO Drive

Max Input Speed:  3000 RPM

Max Torque:  1200 FT-LB Thru Gears

Thru Drive Torque:  12,500 FT-LB

Approximate Weight:  540 lb


Top Mast Drive

Top Mast Drive

Ratio:  2.50 TO 1 Reduction

Max Input Speed:  600 RPM

Max Output Torque:  12,000 FT-LB

Max Pull Out On Output Shaft:  80,000 LB

Max Push In On Output Shaft:  30,000 LB

Approximate Weight:  600 LB