Twin Disc Marine Transmission MGX-5114IV

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.);

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.

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 as instructed?

Enter the current hour reading of the boat

Upload a photo of the lubricated valve

Sign off on the valve lubrication

Check oil level daily or every 10 hours of engine operation

Check with engine running at low idle and with marine transmission in neutral

Check the oil level with the transmission oil temperature in normal operating range

Place the transmission control in NEUTRAL

Check the transmission oil pressure (oil pressure gauges are required for all installations)

Pressure should register within 15 seconds

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 hours of the machine

Is there any sign of torsional vibration, misalignment, degradation by contaminants (oil), heat, ultraviolet radiation, and excessive system torque?

Upload a photo of the coupling for visual inspection

Are there any cracks or signs of distress on the surface of the rubber?

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

Are the flywheel housing vents clear?