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Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

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Twin Disc MG-509 Marine Transmission Parts

Diesel Parts Direct is an Authorized Twin Disc Dealer and carries a great selection of genuine parts for MG-509 DC (deep case) and MG-509 SC (short case) marine transmissions. We stock most popular products like clutch plates, oil pumps, rubber blocks, and bearing kits and have them ready for immediate shipment.

Back to Twin Disc Marine Transmissions Twin Disc MG-509 Specifications

TD-1020520

VALVE ASSEMBLY - MG507 / MG509

$705.36

Qty:

Ships in 2-3 days

TD-215041

DRIVE RING (BOLTS TO FLYWHEEL, 14")

$1,100.63

Qty:

TD-A2916BS

O-RING

$24.35

Qty:

TD-A2916FS

O-RING

PART RECOMMENDED WHEN CHANGING REAR SEALS

$28.71

Qty:

TD-A3905B

RUBBER BLOCK

$17.20

Qty:

In Stock

TD-A4480M

CLUTCH PLATE (DRIVING)

$98.03

Qty:

Ships in 1-2 days

TD-A4632

DRIVE SPIDER (INPUT, 14")

$7,985.45

Qty:

TD-A4898

TOP COVER GASKET

$17.98

Qty:

TD-A4939

CLUTCH PLATE (DRIVEN, STEEL)

$84.22

Qty:

Ships in 1-2 days

TD-A4968A

HUB AND BACK PLATE

$2,616.28

Qty:

Ships in 1-2 days

TD-A4969AE

DIPSTICK

$125.23

Qty:

TD-B1251A

BREATHER

$298.96

Qty:

TD-B1337D

SELECTOR VALVE GASKET

$9.00

Qty:

In Stock

TD-B1646

GASKET

$12.09

Qty:

Ships in 1-2 days

TD-B1653

GASKET

PART RECOMMENDED WHEN CHANGING PUMP

$8.68

Qty:

Ships in 1-2 days

TD-B1656

GASKET

$8.98

Qty:

In Stock

TD-B3136D

DIPSTICK

$93.99

Qty:

Ships in 1-2 days

TD-K465

BEARING KIT

$3,932.45

Qty:

TD-K467

GASKET AND SEAL KIT

$2,152.16

Qty:

Ships in 1-2 days

TD-K468

GASKET AND SEAL KIT

$2,549.19

Qty:

TD-K593

SELECTOR VALVE - MG509

$4,143.84

Qty:

Ships in 1-2 days

TD-M136A

REAR SEAL

$44.30

Qty:

TD-M137

FRONT SEAL

$92.70

Qty:

Ships in 1-2 days

TD-M1959AD

HEAT EXCHANGER

$4,312.05

Qty:

TD-M2074E

LATHE CUT RING

PART RECOMMENDED WHEN CHANGING REAR SEALS

$11.15

Qty:

TD-M2074F

LATHE CUT RING

PART RECOMMENDED WHEN CHANGING FRONT SEAL

$53.83

Qty:

TD-M2368AD

OIL PUMP

$2,251.85

Qty:

Ships in 1-2 days

TD-M2371

REAR SEAL

$99.56

Qty:

TD-M2372

SCREEN ELEMENT FILTER

$244.04

Qty:

Ships in 1-2 days

TD-MA923U

PRESSURE HOSE

$296.61

Qty:

Ships in 1-2 days

TD-PM12863

FILTER ELEMENT - MG507 / MG506

$151.53

Qty:

In Stock

TD-XB2301

DIPSTICK TUBE

$153.39

Qty:

Caterpillar® and all of the Caterpillar® engine models listed on this website are registered trademarks of Caterpillar, Inc. Cummins® and all of the Cummins® engine models listed on this website are registered trademarks of Cummins. Detroit Diesel® and all of the Detroit Diesel® engine models listed on this website are registered trademarks of Daimler AG. John Deere® and all of the John Deere® engine models listed on this website are registered trademarks of John Deere. Allison Transmission® and all of their transmission models listed on this website are registered trademarks of Allison Transmission®. Diesel Parts Direct is not an authorized dealer for Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission. None of the parts beginning with "DS" or "R" are genuine Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission items.

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