Twin Disc Marine Transmission MG-5075SC

Do not obstruct the flywheel housing vents, which will prevent the free flow of air for cooling the coupling. Life of the coupling may be reduced if the ambient temperature of the air around the coupling is outside the operating range.

Temperature within the range of -6°C (22°F) and 82°C (180°F)?

If possible, visually inspect the coupling after the first 100 hours of operation, and every 2000 hours thereafter, or every six months, whichever comes first.

Visual inspection of the coupling performed?

Torsional vibration, misalignment, degradation by contaminants (oil), heat, ultraviolet radiation, and excessive system torque can cause cracks or other signs of distress to appear on the surface of the rubber.

Any signs of distress on the surface of the rubber?

These conditions affect the life of the coupling element. If coupling access is restricted, inspection may be possible only at engine overhaul or whenever the transmission is separated from the engine.

Warning: Do not obstruct the flywheel housing vents, which will prevent the free flow of air for cooling the coupling.

Operating air temperatures maintained between -6°C (22°F) and 82°C (180°F)?

Enter the current operating hours of the machine

Visual inspection of the coupling performed after the first 100 hours of operation?

Any signs of torsional vibration, misalignment, degradation by contaminants (oil), heat, ultraviolet radiation, and excessive system torque?

Any cracks or other signs of distress on the surface of the rubber?

Frequent check of the flywheel housing vents performed?

Any accumulation of residue at the vents?

Warning: This check requires trained personnel with PPE!

Heat exchangers have anodes installed at the inlet and outlet heads

Enter the percentage of the rod disintegrated

Is over one half of the rod disintegrated?

If over one half of the rod is disintegrated, replace it to assure effective protection

Excessive corrosion of the anode indicates electrolytic action

Make a careful inspection to determine if this action is caused by a short circuit or an external grounded electric current

Is the action caused by a short circuit or an external grounded electric current?

If either of these conditions is found, do what is required to correct it to avoid frequent replacement of the anodes

Warning: This procedure requires trained personnel with PPE!

Check the suction screen and filter element after eight hours of operation

Describe the material found on the suction screen and filter element

Did you find chips or shavings in the filter element?

If the filter is clean, install a new filter element and then change the oil and filter element after 1000 hours of service

If the filter is dirty, change the element and operate for another eight hours. Check the filter again

Continue this cycle until the filter is clean and then change the oil and filter after 1000 hours of service, or more often if conditions warrant

Situations involving debris in the hydraulic system will require that heat exchangers and all connecting lines and hoses be thoroughly cleaned

If the heat exchanger cannot be disassembled, or if it cannot be assured that all debris is removed, the heat exchanger should be replaced

Change oil and filter element after each 1000 hours of operation, or six months, whichever comes first. Change the oil more frequently if conditions warrant.

Remove and clean the suction strainer at every oil change or sooner if necessary. See illustrations in Section 6.2 for the location of the suction strainer for your transmission.

Drain the transmission by removing the oil drain plug from the rear/bottom of the transmission. See the illustrations in Section 6.2 or service literature for your transmission for location of transmission and filter drain plugs.

NOTE: Dispose of used oil and oil filters in accordance with federal, state or local laws. Exercise precautions to prevent environmental contamination during any transmission servicing procedure.

1. Remove the breather or the oil fill closure from the top of transmission case.

2. Pour new oil through breather or closure opening. Fill with recommended clean oil, taking necessary precautions to prevent entry of dirt or debris. (See lubrication plate on transmission and information transcribed to the front of this manual for additional oil information.);