This item used for gearbox Mechanical Buffalo (MB) left side.
Dimension : 19.5"
Weight         : 5.5 kg
 
For a Mechanical Buffalo (MB) engine starter, likely powered by a single-cylinder engine (e.g., Kubota EA300 or similar, 7–12 HP) and using a Bando A19 belt for the alternator/starter system, the drive shaft gearbox - left side refers to the drive shaft (or axle shaft) on the left side of the vehicle, which connects to the gearbox or differential within the axle housing. This component transfers torque from the gearbox (driven by the engine via the A19 belt) to the left wheel, enabling propulsion. Since you previously mentioned the left-side and right-side axle housing gearbox, I’ll assume you’re referring to the left-side drive shaft (axle shaft) specifically, which is housed within or connected to the left-side axle housing gearbox.
 
Understanding the Drive Shaft Gearbox - Left Side
Function: The left-side drive shaft is a solid or tubular shaft that transmits rotational power from the gearbox (e.g., a differential or single-speed gear system) to the left wheel. It’s typically encased partially or fully within the left-side axle housing, which protects it and its bearings.
 
Components:
Drive Shaft (Axle Shaft): A steel rod, often 3/4" to 1" in diameter, with splines or a keyway at one end to engage the gearbox (differential gears) and another to connect to the wheel hub.
Gearbox Connection: The shaft engages with the differential’s side gears (bevel or spur gears) or a single-speed gearbox’s output gear, depending on the MB’s design.
Bearings: Support the shaft within the axle housing, typically deep groove ball bearings or tapered roller bearings for semi-floating or full-floating axles.
Seals: Prevent gear oil leakage and protect the shaft from dirt and water.
 
Mechanical Buffalo Context:
Live Axle Design: Most mechanical buffalos use a live rear axle, where a single gearbox or differential drives both left and right drive shafts. The left-side shaft may be identical to or differ in length from the right-side shaft, depending on whether the gearbox is centered or offset.
Semi-Floating Axle: Common in lightweight agricultural vehicles like MBs, where the drive shaft bears both the vehicle’s weight and torque. Full-floating designs (housing bears the weight) are rarer but possible in heavier models.
Power Transmission: The engine’s output, via the Bando A19 belt, drives a pulley or chain that turns the gearbox, which then rotates the left and right drive shafts to power the wheels.
Relation to Axle Housing: The left-side drive shaft is housed within the left-side axle housing (per your previous query). The gearbox (differential or gear reduction unit) is typically shared between the left and right sides, encased by both axle housings.
 
Specific Considerations
Compatibility:
The left-side drive shaft must match the gearbox’s output (e.g., spline count, typically 6–10 splines, or keyway size) and the wheel hub’s connection.
Measure the shaft’s length (often 12–24 inches for small vehicles), diameter (3/4" to 1"), and spline/keyway specs to ensure fitment.
If the gearbox is offset, the left shaft may be shorter or longer than the right. Confirm with the existing shaft or manual.
 
Common Issues:
Wear: Worn splines or keyways cause slippage, leading to loss of power to the left wheel. Listen for clunking or grinding noises.
Vibration: Bent or unbalanced shafts can cause shaking, especially under load.
Bearing Failure: Worn bearings in the axle housing may cause noise or wobble, affecting the shaft.
Seals: Leaking seals can lead to oil loss, damaging the gearbox or shaft.
 
Relation to Right Side and Muffler:
If replacing both left and right drive shafts (or axle housings), ensure they match the gearbox’s gear mesh and spline specs for balanced operation.
Ensure the muffler (from your earlier query) doesn’t interfere with the left-side housing or shaft, as exhaust heat can damage seals or bearings.
 
Sourcing a Left-Side Drive Shaft Gearbox
OEM Parts:
Contact the engine or vehicle manufacturer (e.g., Kubota, Yanmar, or the MB brand) for OEM drive shafts. For example, Kubota dealers like Messicks or TractorJoe may stock parts for engines like the EA300.