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225.706.4858 (Int.)
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Twin Disc MG-520-1 DC Marine Transmission Parts

Diesel Parts Direct is an Authorized Twin Disc Dealer and carries a great selection of genuine parts for MG-520-1 DC (deep case) marine transmissions. We stock most popular products like clutch plates, oil pumps, rubber blocks, and filters and have them ready for immediate shipment.


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If you know the correct Twin Disc part number, please enter it in the search box located in the navigation bar, or use any of our quick links below to access the most common parts available for this model.

If you do not see the parts you are looking for, please use our quote request form or call us at 888.687.0539: our knowledgeable inside sales staff will gladly assist you.

Twin Disc MG-520-1 Deep Case Transmission Specifications



Available Ratios
4.49:1, 5.00:1, 6.11:1, 7.00:1
Oil Capacity
19.0 U.S. gallons (72L), plus hoses and heat exchanger
Oil Pump Capacity
30.5 GPM at 2000 RPM
Maximum Input Speed
2400 RPM
Other Info

FILTER (SPIN ON)

  • $70.98
    • $70.98
    Qty: 

    FRONT SEAL

  • $85.56
    • $85.56
    Qty: 

    GASKET

    PART RECOMMENDED WHEN CHANGING PUMP

  • $9.65
    • $9.65
    Qty: 

    REAR SEAL RETAINER O-RING

    PART RECOMMENDED WHEN CHANGING REAR SEALS

  • $32.55
    • $32.55
    Qty: 

    O-RING

  • $10.80
    • $10.80
    Qty: 

    O-RING

    PART RECOMMENDED WHEN CHANGING REAR SEALS

  • $32.09
    • $32.09
    Qty: 

    O-RING

    PART RECOMMENDED WHEN CHANGING SCREEN

  • $6.70
    • $6.70
    Qty: 

    REAR SEAL

  • $226.33
    • $226.33
    Qty: 

    RUBBER BLOCK

  • $16.44
    • $16.44
    Qty: 

    SCREEN

  • $82.01
    • $82.01
    Qty: 

    SELECTOR VALVE GASKET

  • $7.20
    • $7.20
    Qty: 

    TOP COVER GASKET

  • $55.45
    • $55.45
    Qty: 

    WEAR SLEEVE

    PART RECOMMENDED WHEN CHANGING FRONT SEAL

  • $27.23
    • $27.23
    Qty: 

    BEARING KIT

  • $7,340.23
    • $7,340.23
    Qty: 

    GASKET AND SEAL SET

  • $1,464.72
    • $1,464.72
    Qty: 

    OIL PUMP (STANDARD, RIGHT END)

  • $2,455.79
    • $2,455.79
    Qty: 

    SELECTOR VALVE

  • Call for pricing
    • Call for pricing
    Qty: 

    CLUTCH CYLINDER

  • $4,893.40
    • $4,893.40
    Qty: 

    CLUTCH HUB

  • $3,321.49
    • $3,321.49
    Qty: 

    CLUTCH PLATE (DRIVEN, STEEL)

  • $84.60
    • $84.60
    Qty: 

    DIPSTICK

  • $72.28
    • $72.28
    Qty: 

    DIPSTICK TUBE

  • Call for pricing
    • Call for pricing
    Qty: 

    DRIVE RING (BOLTS TO FLYWHEEL, 18")

  • $1,038.39
    • $1,038.39
    Qty: 

    DRIVE SPIDER (INPUT, 18")

  • $2,587.31
    • $2,587.31
    Qty: 

    OUTPUT FLANGE

  • $3,569.82
    • $3,569.82
    Qty: 

    SHIM PLATE

  • $46.71
    • $46.71
    Qty: 

    TORSIONAL ELEMENT (VULKAN, SILICON)

  • $5,201.91
    • $5,201.91
    Qty: 
    Hundreds Of Items Guaranteed in Stock
    Hundreds Of Items Guaranteed in Stock Click here for details
    Great Selection of Block Heaters and Glow Plugs

    GREAT SELECTION OF BLOCK HEATERS AND GLOW PLUGS

    Everyday Free Ground Shipping on Select Overhaul Kits and Turbos
    Everyday Free Ground Shipping on Select Overhaul Kits and Turbos Click here for details

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