The chart below shows the areas boat owners have most common questions on when trying to troubleshoot why their Twin Disc Ā® marine transmission MG514C underperform. It categorizes areas of possible malfunction, likely cause and recommended action to bring your new, rebuilt or used Twin Disc Ā® marine transmission back to proper operation. The chart will give you confidence when speaking with your Twin Disc Ā® marine transmission mechanic or ordering parts. As a quick reference guide only, the chart must not be thought of as a substitute for the use of your Twin Disc Ā® marine transmission MG514C Owner's operating or service manual.
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AREA |
PROBLEM |
POSSIBLE REASON |
RECOMMENDED ACTION |
CHECK |
OIL PRESSURE |
Low oil pressure |
Partially clogged oil strainer | Remove and clean. | ā |
Stuck pressure regulation piston in selector valve assembly | Remove selector valve assembly. Disassemble the valve and clean piston. | |||
Broken piston rings on clutches | Remove the manifold and dissemble the clutches. Replace piston rings. | |||
Come-home setscrew loose or missing | Remove the some-home access pipe plugs. Tighten a loose come-home setscrew by turning counterclockwise, or replace setscrew. | |||
Damaged or worn oil pump assembly. | Remove and replace oil pump . | |||
Incorrect linkage installed on selector valve assembly | Adjust linkage so that selector valve stem is indexed properly by detent. | |||
Clogged or plugged orifice in orifice plate of selector valve assembly | Remove orifice plate cover. Clean parts. | |||
No oil pressure, |
Low oil level or empty sump. | Check gaskets and seals for leakage. Find parts causing leakage fill marine gear and replace them. | ||
Fully clogged oil strainer | Remove and clean oil strainer. | |||
Damaged or worn oil pump assembly. | Remove and replace oil pump . | |||
High main oil pressure |
Stuck pressure regulation piston in selector valve assembly. | Remove selector valve assembly. Disassemble the valve and clean piston. | ||
Overheating |
Insufficient heat exchanger capacity. | Find a heat exchanger of sufficient capacity and replace it. | ||
Insufficient cooling water flow. | Inside diameter of water lines too small. Replace lines with larger inside diameter hoses. | |||
Clutches Slipping. | Low oil pressure will cause a clutch to slip. Adjust clutch. | |||
Oil levels too high | Correct oil level. | |||
Improper oil sump. | Drain marine gear, and fill with proper oil. | |||
Clutch plates warped | Replace Clutch plates . | |||
Excessive noise |
Worn splines between reverse driving and driven gears and clutch shafts | Remove marine gear, dissemble marine gear, and replace worn splined parts. | ||
Bearing failure | Remove marine gear. Dissemble marine gear and replace damaged or worn parts | |||
Worn or damaged rubber blocks | Remove marine gear and replace worn or damaged rubber blocks | |||
No neutral |
Clutch plates warped | Replace Clutch plates. | ||
Harsh engagement |
Steel ball in selector valve not seating properly. | Remove orifice plate cover clean parts. Replace parts if necessary . | ||
CLUTCH |
Clutch slips |
Improper adjustment | Adjust Clutch. | |
Clutch will not remain engaged |
Clutch adjustment too tight | Adjust Clutch. | ||
Improper remote engaging linkage. | Adjust linkage as required to assure proper travel of operating lever. Engaging force must be removed after complete engagement of the clutch. | |||
Power Take-off continues |
Warped or welded clutch plates | Remove power take-off and replace clutch plates . | ||
Bearing failure | Remove power take-off and replace clutch plates . |