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These also keep water from getting into the gear case. The oil must remain within the gearbox with the help of O-rings and seals. When this occurs, power transfer between the proper shaft and driveshaft is reduced, so the outboard feels like it has lost performance.Īdditionally, the gearbox can become noisy or the gears might chatter as they become loose. You also want to maintain the rigging, ensuring none of the shift cables or throttle cables get stretched.Īdditionally, the gear shims and pinion will wear down. You can prevent premature clutch wear by shifting at lower RPM. When it’s time for a replacement, you might hear a grinding noise while shifting. The opposite occurs when the shift shaft is in Reverse, allowing it to move the other direction.īoth gears and the prop shaft are mounted with bearings, which keeps everything rotating freely, yet supported in the gear case.Īs time goes on, the dog clutch teeth wear out, so you will need to replace it. When the shift shaft is in Forward, the dog clutch is engaged, causing the prop shaft and dog clutch to rotate in a specific direction. The prop shaft is also attached to this dog clutch.Īnytime that that shift shaft is placed in Neutral, the clutch doesn’t engage with the gears, keeping the boat motionless. There is also a dog clutch sitting between the gears and attached to a shift shaft. When the drive shaft rotates, the pinion gear also rotates, allowing the gears to turn. This pinion gear is engaged with both the forward and reverse gears. The drive shaft comes into the gearbox, but it ends when it reaches the pinion gear. It also helps to determine which way the propeller and prop shaft should rotate. The gearbox or gear case uses the vertical rotational power coming from the driveshaft and turns it into horizontal rotational power for the prop shaft and propeller. You won’t have to maintain the shift shaft in any way, as it should last as long as your outboard. It’s also used to decide which direction the prop shaft needs to rotate, ensuring that the boat goes in reverse or forward. The shift shaft is responsible for putting the outboard in or out of gear by working with the transmission. You might also need to replace the bottom plate, cartridge, O-rings and gaskets when you change the impeller. Replace the impeller once every 300 hours or once every two years. To maintain the water pump, you want to disassemble and inspect it. Left unrepaired, it can cause worn-out pistons or cylinders, eventually causing the engine to seize. When the water pump fails, the motor overheats. Once the water passes through the engine, it is jettisoned out, back to where it originated. The blade’s movement sucks water from below the water pump housing housing and pushes it into the engine. When the drive shaft rotates, the impeller inside the water pump turns. This part uses an impeller that is attached to the driveshaft, using the rotation as power. The water pump delivers water through the engine to cool it. You don’t need to perform much maintenance to the driveshaft, as long as the lower unit remains maintained. The driveshaft is responsible for converting the rotation power from the motor to the gear case.
REASON 10.3 AND OUTBOARD GEAR HOW TO
That’s why it’s vital to understand how each part works and how to maintain it. If one part of the lower unit isn’t working correctly, or fails, you could become stranded in the water. The propeller rotates, which allows your boat to move either forward or backwards through the water. It’s the portion of the outboard that receives the rotation and power from the engine’s powerhead to transfer it to the propeller and prop shaft. The lower unit is also known as the gearcase. We have an in-depth extensive article on what the different colors of gear lube tell you when you change it here.
REASON 10.3 AND OUTBOARD GEAR FREE
Performing lower unit maintenance is as simple as keeping the debris and fishing line free from the prop, as well as regularly changing the oil. To keep your outboard running its best and give it the longest life possible, you must take care of the lower unit.
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It’s the bottom portion that houses the gear case and prop shaft that changes the direction that the propeller spins in. The lower unit of the outboard motor is otherwise referred to as the foot, gear case, or gear box. What is the Lower Unit on an Outboard Motor?