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The chart below shows the areas boat owners have most common questions on when trying to troubleshoot why their Twin Disc Ā® marine transmission MG507 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 MG507 Owner's operating or service manual.
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|
AREA |
PROBLEM |
POSSIBLE REASON |
RECOMMENDED ACTION |
CHECK |
|
OIL PRESSURE |
Low oil pressure |
Partially clogged filter screen | Remove and clean filter screen | ā |
| Stuck main regulator valve. | Remove main regulator valve parts from valve body, and clean parts. | |||
| Broken or worn piston rings on clutch shafts | Remove pump mount and selector valve assembly from rear cover. Remove piston rings from clutch shafts. Install new piston rings on clutch shafts. | |||
| Damaged or worn oil pump assembly. | Remove and replace the oil pump assembly. | |||
| Damaged or worn clutch piston, piston rings | Remove marine gear. Disassemble clutches, and replace damaged or worn parts. | |||
| Scored valve bore in selector valve assembly. | Remove selector valve assembly. Disassemble selector valve assembly and inspect valve bore. | |||
| Reverse clutch housing gear turning on shaft. | Remove and replace the oil pump assembly. | |||
|
No oil pressure |
Low oil level or empty sump. | Check gaskets and seals for leakage. Replace parts causing leakage, and fill marine gear sump. | ||
| Fully clogged filter screen. | Remove and clean filter screen. | |||
| Damaged suction tube. | Disassemble and inspect suction tube. Replace parts as required. | |||
| Damaged or worn oil pump assembly. | Remove and replace oil pump assembly | |||
| Broken clutch shaft | Remove marine transmission. Dissemble clutches, and replace damaged or worn parts. | |||
|
High main oil pressure |
Stuck main regulator piston. | Remove main regulator valve parts from valve body and clean parts. | ||
|
Overheating |
Insufficient heat exchanger capacity. | Find a heat exchanger of sufficient capacity and replace it. | ||
| Insufficient cooling water flow. | Replace lines and/or hoses with larger inside diameter lines and/ or hoses. | |||
| Clutches Slipping. | Low oil pressure, removes marine transmission, disassemble, and inspect for worn clutch plates. | |||
| Oil levels too high | Correct oil level. | |||
| Improper oil sump. | Drain marine gear, and fill with proper oil. | |||
| Clutch piston springs broken. | Remove marine transmissions dissemble clutches and replace damaged or worn parts. | |||
| Clutch plates warped | Replace clutch plates Remove marine transmissions dissemble clutches and replace damaged or worn parts | |||
| Improper bearing adjustment with shims (especially after overhaul) | Check end play of shafts, and make proper shim adjustments. | |||
|
Excessive noise |
Air leak in suction side of system. | Tighten all fittings and or replace a damages hose. | ||
| Worn gear teeth or splines on marine transmission parts. | Overhaul marine transmission and replace worn parts. | |||
| Bearing failure. | Overhaul marine transmission. Replace damaged parts. | |||
| Worn or damaged rubber blocks. | Remove marine transmission and replace worn or damaged rubber blocks. | |||
| Excessive bearing end play. | Check and reset and play. | |||
|
No neutral |
Clutch plates warped. | Remove marine transmissions dissemble clutches and replace damaged or worn parts. | ||
| Clutch piston spring broken and jammed. | Remove marine transmissions dissemble clutches and replace damaged or worn parts. | |||
| Selector valve linkage incorrect. | Check linkage and adjust. | |||
| Scored bore in valve body of selector valve assembly. | Remove selector valve assembly. Disassemble selector valve assembly and inspect valve bore. | |||
|
Harsh engagement |
Air in oil. | Correct air leaks in suction side of system. Change oil to proper type. | ||
| Binding clutch piston. | Remove marine transmissions dissemble clutches and replace damaged or worn parts. | |||
|
No pressure and No output power |
Input shaft broken. | Overhaul marine gear. Replace broken or damaged parts. | ||
| Drive spider broken. | Overhaul marine gear. Replace broken or damaged parts. | |||
| Drive spider or input gear keys sheared. | Overhaul marine gear. Replace broken or damaged parts. |
