PIÑON FORWARD 57510-93902

Function and technical context

The forward sprocket is a key component within the reversing box (reduction box) transmission system of Suzuki outboard engines. Its mission is to transmit the engine torque from the drive shaft to the propeller in the forward direction, meshing with the bevel pinion of the propeller shaft. When this pinion shows wear or breakage on its teeth, the power transmission is interrupted or an internal seizure point occurs that can completely render the gearbox unusable. A sprocket in poor condition not only reduces navigation performance, but can cause chain damage to the propeller shaft, the rear sprocket and the lower case bearings, making this element a piece of utmost attention in any transmission overhaul.

When to replace this part?

The most common symptoms of a damaged forward sprocket are: metallic noise or rattling when engaging forward gear, difficulty shifting into forward gear, abnormal vibration while driving, or sudden loss of traction with the engine running. In engines with intensive use, it is recommended to inspect the condition of the pinion and the reduction box assembly during each seasonal maintenance or every 200-300 hours of operation. Replacing this component preventively, at the first signs of excessive play or visible wear on the teeth, avoids more serious and costly breakdowns that can leave the boat inoperable.