Twin Disc Marine Transmission MG-5091SC

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

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

Are the anodes corroded with foreign material?

Warning: Do not obstruct the flywheel housing vents

Operating air temperatures within range (-6°C to 82°C)?

Enter the current operating hours of the machine

Visual inspection of the coupling 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?

Any accumulation of residue at the vents?

If an accumulation of residue is found, describe the possible cause.

If your unit is equipped with a lubrication fitting, grease the oil seals at the output end of the transmission output shaft through the lubrication fitting with water pump grease.

See the illustrations in Section 6.2 for location of the lubrication fitting.

Apply grease approximately every 100 hours when boat is docked. No other lubrication is required.

NOTE: Preferred grease is one with lithium soap, NLGI consistency #2 for component temperatures above 20° C (68° F).

Enter the current hour meter reading

Sign off on the lubrication procedure

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 procedure requires trained personnel with PPE!

Suction screen and filter element checked after eight hours of operation?

Upload a photo of the suction screen and filter element

Select the type of material found on the suction screen and filter element

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

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.