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