Twin Disc Marine Transmission MGX-516

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.);

Warning: This procedure requires trained personnel with PPE!

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

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

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).

Did you apply the grease to the oil seals at the output end of the transmission output shaft?

Did you use the preferred grease with lithium soap, NLGI consistency #2?

Enter the current hour reading of the boat

Sign off on the lubrication procedure

Engine running at low idle and marine transmission in neutral?

Transmission oil temperature in normal operating range?

Transmission control in NEUTRAL?

Pressure registered within 15 seconds?

Transmission filled to LOW mark on the dipstick?

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

Operating air temperatures are within -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?

Visual inspection of the coupling performed every 2000 hours or every six months, whichever comes first?

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?

Coupling access is not restricted?

Frequent check of the flywheel housing vents performed?