Twin Disc Marine Transmission MGX-516

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

Warning: This procedure requires trained personnel with PPE!

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

Describe the material collected from rags or towels used in the parts cleaning process

Describe the chips or shavings collected, if any

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

With a new transmission, change the oil and filter element within first 50 hours of operation. 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.

Place the transmission control in NEUTRAL.

As soon as engine starts, check the transmission oil pressure (oil pressure gauges are required for all installations). Pressure should register within 15 seconds.

Check the oil level as follows.

Fill the transmission to LOW mark on the dipstick. Run the engine at idle until oil temperature reaches operating range.

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.

Allow the oil to cool to ambient temperature (perhaps overnight). Start the engine and check the oil level while cold at low idle engine speed with the engine in neutral. Make a note of this adjusted cold oil FULL level for future reference. DO NOT OVERFILL.

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?