Twindisc mgx 6598

Palmer Johnson is North America’s leading distributor for all of your Twin Disc MGX-6598DC (MGX6598DC, MGX6598, MGX-6598) 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 MGX-6598DC transmission, we’ve got you covered. Contact us today and you’ll be back up and running in no time!

MGX-6598 DC

Standard Equipment

  • Vertical offset, aluminum housing
  • Electric GP-valve with manual override
  • EC050 Profile module – interface for engagement signals
  • Integral oil cooler for raw water cooling
  • Oil strainer and oil filter


  • SAE J617 housing no. 1
  • SAE J617 housing no. 0
  • Flexible coupling for 14” flywheel (SAE J620 size 355)
  • Flexible coupling for 18” flywheel (SAE J620 size 460)
  • Input flange for freestanding installation
  • EC050 E-Troll module – interface for engagement & trolling signals
  • Harness with single point interface to Twin Disc EC300 control system
  • Output shaft driven trailing pump
  • Companion flange/ bolts set
  • Monitoring devices to customer’s specification
  • Mounting brackets
  • Live PTO
    • SAE J744 size 127-4, 32-4 (SAE “C”, 4-bolt) – max. 600 Nm
  • Hydraulic Clutchable PTO
    • SAE J744 size 127-4, 32-4 (SAE “C”, 4-bolt) – max. 600 Nm
  • Secondary live PTO for power steering pumps
    • SAE J744 size 101-2, 22-4 (SAE “B”, 2-bolt) – max. 75 Nm or
    • SAE J744 size 82-2, 16-4 (SAE “A”, 2-bolt) – max. 75 Nm

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Maximum 1462 kW (1961 hp) @ 2300 RPM [Pleasure Craft]

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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.