Logan PTO and CAT Genset

A major harbor tug operator in the US had a need to up-grade some of it’s old Detroit Diesel driven Gensets. This operator has the hydraulic requirements for the boat and deck winches provided by two hydraulic pumps mounted on the front of two redundant Gensets. (This is an alternate solution to main engine mounted hydraulic pumps and allows for the hydraulic systems to be run at the dock and without the mains being operated.)


In normal operation, one genset provided all of the ships power. The second genset provided all of the ships hydraulic requirements. In an emergency where additional electricity or additional hydraulic pump flow was required, the second unit could be used to provide additional resources. In the event of a failure, one genset could provide enough electricity and hydraulic flow for the boat to still operate until the first unit could be repaired, keeping a valuable piece of equipment operating and providing revenue. The clutch allowed the pump not being used to be disengaged, doubling the life of the pump and lowering the parasitic power draw from the genset engine.

The original configuration was with a mechanical Bell Housing clutch with a pump face output on the front of the Detroit Diesel. The older engines were replaced because:

  • They were at the end of their useful life
  • They used significantly more fuel than new modern ACERT engines
  • They produced significantly more emissions than new Tier 2 conforming engines

Further, it was expected that the reduced cost to operate and maintain the new engines would pay back the acquisition cost in just a few years.

New Cat powered gensets were selected. The 1800 RPM of the new genset was higher then the 1200 RPM of the old slow turning Detroits. That change required that the pumps be replaced as well. The new genset engines were not available with optional front bell housing mounts. The customer had tried several other older design system solutions with electric clutches and drum style air clutches with speed reducing gearboxes mounted on shipyard installed fabricated beds with foot mounts. All installations suffered from premature failures due to the high torsional vibration transmitted by the new Tier II engines.

New Logan Clutch front mount PTO kits were also selected. The Logan Clutch front mount kit provided a lot of advantages over the old configuration.

  • Remote activation from the helm simplified with standard pneumatic controls.
  • Logan Clutches that are self adjusting for wear meant ZERO adjustment maintenance during service life.
  • Kit/bracket pre-engineered package kept installation time in yard and custom fabrication requirements to a minimum.
  • Integrated torsional coupling for torsional vibration resistance.
  • System entirely mounted to the engine keeps all components attached to the engine vibrating together and not rigidly mounted to another component further reducing susceptible to torsional vibration wear.
  • 100% of rated torque can be taken from front of engine through clutch.
  • Clutches rated for 100% duty cycle guaranteed long life in a demanding application.

Installation was successfully completed in just a few short days without a haul out.

After several years of operation there has not been any downtime due to torsional failure. The Logan systems have been so much more reliable than any of the others, that several “new” alternate designs have been replaced with Logan Clutch front mount kits.


Most Recent

Logan Direct Drive PTO Clutches Enhance Bow Thruster

By Andrew Logan
April 13, 2018 Category: Direct PTO, Marine

Steering a commercial boat or large yacht can be similar to driving a heavy car with bad brakes. Its difficult to stop, and response to the rudder is slow. This poses no problem in the open sea, but it can be real challenge to maneuver the vessel in a congested marina or when docking. This is where a bow thruster comes in. A bow thruster consists of an open-ended tube that runs through the underwater sections of the hull near the bow and perpendicular to the keel. A propeller mounted at some point inside this tube can rotate in either direction. The helmsman selects the rotational direction and actuates the propeller. As a result, the bow thruster sucks a solid stream of water in one end of the tube and forces it out of the other, pushing the bow sideways and augmenting the rudder to make steering more responsive. Two Props are better than one Traditional single propeller systems generate thrust by accelerating water in the axis of the propeller shaft. However, the water discharged

Logan Bell Housing PTOs Now Available for Jet Stream Waterblasters

By Andrew Logan
April 13, 2018 Category: Bell Housing, Water Blasting, Hydro Excavation / Vacuum / Water Jetting Equipment

Logan self-adjusting, hydraulically actuated Bell Housing Power Take-Off (PTO) clutches have been standard equipment on OEM marine and mobile equipment for over 18 years. Thousands of Logan units are in the field, operating on airport snow blowers, highway and airport marking and runway rubber removal equipment, and more recently trailor mounted waterblasting equipment. Logan vs. Mechanical PTOs The advantage of the Logan Clutch is its ability to engage and disengage the water jetter hydraulically, through push-button activation, eliminating the use of a mechanical hand lever or yoke type clutch engagement system, which dates back to the early 40s. Smooth, Logan softstart engagement eliminates clutch downtime due to over and under adjustment. And since the Logan clutch is self-adjusting, clutch engagement is smooth and consistent after hundreds of hours of use. The mechanical clutch requires the operator to hand engage a clutch, which opens up the opportunity for untrained operators

Logan Self-Adjusting Bell Housing PTO Clutches Now available for Field Retrofit into 2005 and older Oshkosh H-Series Blowers

By Logan Clutch
April 11, 2018 Category: Mobile, Snowblowing

Logan self-adjusting Bell Housing PTO clutches have been standard equipment on all Oshkosh H-Series Blowers manufactured since 2005. Hundreds of Logan units are in the field, operating at a high level of excellence and readiness for major U.S. Airports such as Chicago OHare, Boston Logan, Cleveland-Hopkins, Buffalo Airport, and more. The Logan Advantage: The advantage of the Logan clutch is its ability to engage the snow blower drivetrain hydraulically (for factory blower trucks), and pneumatically (for pre-2005 H-Series field retrofits). This eliminates the use of a mechanical hand lever or yoke type clutch engagement system, which requires frequent mechanical adjustments many times during snow removal conditions, which leads to downtime and inconsistent operation. For example, mechanical clutches that were improperly adjusted, often led to disc wear and eventual clutch failure requiring the truck to be taken out of commission, requiring many hours to pull the blower trucks drivetrain

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