Free - Twin Disc MG-509 Troubleshooting Guide Twin Disc MG 509 Marine Transmission Parts - Oil Cooler Section Loading... 1 Twin Disc Oil cooler for marine gears MG509, MG514 & MG514C . Price: $ 1,303.01 Qty: ^ Pictures In Stock Add to Cart 2 Twin Disc Oil cooler for marine gears MG509, MG5090A, MG5111, MG5111A, MG5114, MG5114A . Price: $ 1,412.40 Qty: ^ Pictures In Stock Add to Cart 3 Twin Disc Oil pump for marine gear MG509 Oil pump for Twin Disc marine gear MG509 Price: $ 2,133.74 Qty: ^ Pictures In Stock Add to Cart 4 Twin Disc Oil Filter for MG509 Oil filter Price: $ 234.94 Qty: ^ Pictures In Stock Add to Cart 5 Breather for Twin Disc marine transmission MG509, MG514 . Price: $ 262.97 Qty: ^ Details In Stock Add to Cart 6 Mechanical Gauges Standard Mechanical Gauges with Alarm Electrical Gauges 12 Volts Electrical Gauges 24 Volts 7 Controls Cables & More... See All Control, Cables & More 8 Marine Water Pumps Detroit Diesel Cummins Caterpillar John Deere See All... 9 Fresh Water Pumps Detroit Diesel Cummins Caterpillar John Deere Free - Twin Disc MG-509 Troubleshooting Guide