Caterpillar Marine Transmissions

It's typical to think of power in terms of engine ratings, but to efficiently transfer power requires a transmission with the correct gear ratio. After all, your marine transmission is what supplies torque to the propeller. That's why if you're using a Caterpillar marine propulsion engine, you should also consider using a Caterpillar 7200 Series marine transmission.

Caterpillar 7200 Series Marine Transmissions

High speeds on demand may be desirable, but that's not necessarily related to propeller rpms. That's because a slower propeller speed delivers more power while a higher speed can cause a vessel's propeller to operate more inefficiently. That's why it's critical to choose the right Caterpillar marine transmission for your engine and application.

7211

• Gear ratio: 5:1
• Flywheel housing: SAE 1
• Drive type: spider
• Maximum oil temperature: 200 degrees F (93 degrees C)
• Minimum oil pressure: 255/285 psi (1,757/1,964 kPa)
• Maximum cooler inlet water temperature: 195 degrees F (91 degrees C)

7221

• Gear ratio:5:1
• Drive type: double bearing
• Maximum oil temperature: 200 degrees F (93 degrees C)
• Minimum oil pressure: 255/285 psi (1,757/1,964 kPa)
• Maximum cooler inlet water temperature: 195 degrees F (91 degrees C)

7231

• Gear ratio:67:1
• Flywheel housing: SAE 0
• Drive type: spider
• Maximum oil temperature: 200 degrees F (93 degrees C)
• Minimum/minimum oil pressure: 255/285 psi (1,757/1,964 kPa)
• Maximum cooler inlet water temperature: 195 degrees F (91 degrees C)

7241

• Gear ratio:55:1
• Maximum oil temperature: 175 degrees F 79 degrees C)
• Minimum/maximum oil pressure: 255/285 psi (1,757/1,964 kPa)
• Maximum cooler inlet water temperature: 120 degrees F (49 degrees C)

7251

• Gear ratio: 4:34:1
• Flywheel housing: SAE 00
• Drive type: spider
• Maximum oil temperature: 175 degrees F (79 degrees C)
• Minimum/maximum oil pressure: 245/275 psi (1,688/1,895 kPa)
• Maximum cooler inlet water temperature: 120 degrees F (49 degrees C)

7261

• Gear ratio:65:1
• Maximum oil temperature: 175 degrees F (79 degrees C)
• Minimum/maximum oil pressure: 265/285 psi (1,826/1,964 kPa)
• Maximum cooler inlet water temperature: 120 degrees F (49 degrees C)

7271

• Gear ratio:5:1
• Drive type: double bearing
• Maximum oil temperature: 200 degrees F (93 degrees C)
• Minimum/maximum oil pressure: 290/310 psi (1,998/2,136 kPa)
• Maximum cooler inlet water temperature: 120 degrees F (49 degrees C)

Although Caterpillar marine transmissions are no longer in production, finding one to pair with your Caterpillar marine engine can be your best bet whether you’re operating a pleasure craft, a tugboat, or a large ocean-going vessel.