Twin Disc Marine Transmission MG-5061SC

Warning: Do not obstruct the flywheel housing vents.

Is the ambient temperature of the air around the coupling within the operating range (-6°C to 82°C)?

Enter the current operating air temperature

Is there any visual sign of distress on the surface of the rubber?

Describe the signs of distress observed

If coupling access is restricted, inspection may be possible only at engine overhaul or whenever the transmission is separated from the engine.

Is there an accumulation of residue at the vents?

Look for lint or other material that may collect from rags or towels used in the parts cleaning process.

Look for chips or shavings particularly if the transmission has had a problem that caused debris in the system. (For units with spin-on filters, this will require cutting the filter element apart to access the element core.); 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.

NOTE: 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.

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.

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 corrosion due to 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

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.);

See the transmission lubrication plate. Capacity given will be the internal quantity required to fill the transmission to its proper level, but may not include the quantity to fill the external hoses and heat exchanger. Check oil level per Section 3.3, Start-Up.

1. Place the transmission control in NEUTRAL.

2. As soon as engine starts, check the transmission oil pressure (oil pressure gauges are required for all installations). Pressure should register within 15 seconds. If no pressure is indicated, stop the engine and determine the cause.

3. Check the oil level as follows.

a. Fill the transmission to LOW mark on the dipstick.

Run the engine at idle until oil temperature reaches operating range.

b. Continue running at idle and check the oil level with the oil level gauge (dipstick). The level should be at the FULL mark on the gauge. Add or remove oil as necessary to bring the level to the FULL mark on the gauge.