Fast Gearbox Assembly & Parts

Reliable Transmission Solutions: 9JS, 12JS, and 16JS Series

As the primary transmission for SHACMAN and many other heavy-duty brands, Fast Gearbox is world-renowned for its dual-countershaft design and high torque capacity. ARCHER provides both complete Gearbox Assemblies and precision Internal Components for the most popular 9-speed, 12-speed, and 16-speed models. Our products are engineered for seamless shifting and long-term durability in heavy-load mining and long-distance hauling conditions.

Gearbox Series	Common Models	Critical Spare Parts
9JS Series	9JS119, 9JS135, 9JS150	Synchronizers, Input Shafts, Main Shaft Gears, Countershafts, Gearbox Housing, Shifting Valves, and Clutch Release Bearings.
12JS Series	12JSD160, 12JSD180, 12JSD200
16JS Series	16JS160T, 16JS200T, 16JSD220

Heavy-Duty Transmission Engineering

Precision Heat Treatment

All gears and shafts undergo specialized carbonitriding to achieve maximum surface hardness and core toughness.

Smooth Gear Shifting

Our high-quality synchronizer rings ensure fast and quiet gear engagement, reducing wear on the transmission teeth.

Full Assembly Testing

Each complete gearbox assembly is factory-tested for noise, sealing, and gear engagement before export.

Fast Gearbox FAQ

Q1: How do I identify the exact model of my Fast gearbox?

There is an Aluminum Nameplate on the side or top of the gearbox housing. Please provide the Model Number and Serial Number for accurate parts matching.

Q2: What is the difference between JS and JSD series?

The “D” in JSD stands for “Double” countershaft with a shorter center distance. JSD models are usually more compact and designed for higher torque ratings.

Q3: Do you provide PTO (Power Take-Off) for Fast gearboxes?

Yes, we supply various PTO units compatible with Fast gearboxes for dump trucks, concrete mixers, and crane applications.