Twindisc mg5050

Twin Disc MG-5050 Series Marine Gears

The Twin Disc MG-5050 series consists of three models being the MG-5050SC, MG-5050RV & MG-5055A (MG5050SC, MG5050RV & MG5050A). Palmer Johnson is North America’s leading distributor for all of your MG-5050 marine gear transmission needs. Whether you are needing a replacement marine gear transmission, parts to do the repair yourself, or if you are wanting the factory trained technicians of PJ’s service department to rebuild your Twin Disc MG-5050 transmission, we’ve got you covered. Contact us today and you’ll be back up and running in no time!

Standard Equipment

MG-5050 SC & MG-5050 A

  • 11.5” torsional input couplings
  • Clutch fill rate-of-rise valve
  • Oil strainer
  • SAE housings no. 3 and 2

MG-5050 RV

  • Remote V-drive, aluminum housing
  • 10° down angle on output shaft
  • Input flange
  • Mechanical control valve
  • Oil strainer


  • SAE J617 no. 2 to SAE J617 no. 1 housing adaptor
  • SAE J617 housing no. 2
  • SAE J617 housing no. 3
  • SAE J617 housing no. 4
  • Flexible coupling for 14” flywheel (SAE J620 size 355)
  • Flexible coupling for 11.5” flywheel (SAE J620 size 290)
  • Flexible coupling for 10” flywheel (SAE J620 size 255)
  • Electric control valve (12VDC or 24 VDC)
  • Mechanical trolling valve
  • Oil cooler
  • Companion flange/ bolts set
  • Monitoring devices to customer’s specification
  • Mounting brackets
  • Live PTO:
    • SAE J744 size 82-2, 16-4 (SAE “A”, 2-bolt, max. 35 Nm)
    • SAE J744 size 101-2/4, 22-4 (SAE “B”, 2/4-bolt, max. 197 Nm)

Contact Us

Please be as specific as possible by including how we can assist along with any relevant information such as spec number, BOM number, or serial number.
Twin Disc Logo

Authorized Distributor

Palmer Johnson is an authorized distributor and service provider for Twin Disc products.

Genuine Parts

Thousands of parts ready to ship in as little as two hours from our store at

Service and Support

Seven master rebuild centers, ten full-service centers, and an extensive dealer network to serve you.