The Shacman X5000 Flywheel Ring Gear with OEM number 611600020005 is a critical component that transfers starter motor torque to the flywheel for engine cranking. This precision-engineered ring gear features induction-hardened teeth designed to withstand repeated high-impact engagement cycles. The 611600020005 flywheel ring gear is manufactured from high-strength carbon steel (SAE 1060) with a uniform tooth profile, ensuring reliable starting performance even in extreme cold or after thousands of start-stop cycles in heavy-duty applications.
Engineered specifically for Shacman X5000 trucks (WP12, WP13, and ISM engines), the genuine ring gear is shrink-fitted onto the flywheel with precise interference. OEM 611600020005 features 137 teeth (module 3.0) with an optimized involute profile that reduces starter gear noise and wear. The tooth flank hardness is controlled between 53–58 HRC, while the core remains ductile at 25–35 HRC, preventing tooth breakage under shock loads.
Aftermarket ring gears often suffer from inconsistent hardness, tooth profile errors, or improper fitment, leading to starter grinding, skipped starts, or premature gear stripping. Genuine 611600020005 is 100% inspected for tooth geometry (using an optical comparator), hardness depth, and interference fit diameter. The ring gear also undergoes magnetic particle inspection to detect any surface cracks from heat treatment.
Choosing OEM 611600020005 eliminates starting problems, protects the starter motor, and ensures that your Shacman X5000 engine fires up every time. Replace this ring gear as part of a flywheel overhaul or when teeth show visible wear, chipping, or cracking.
The flywheel ring gear is subjected to extremely high torque and shock loads during engine cranking. Repeated starter engagements cause gradual tooth wear, and if the ring gear fails, the engine will not crank. OEM 611600020005 is made from medium-carbon steel that is induction-hardened only on the tooth flanks, leaving the core tough to absorb impact without fracturing. This differential hardening is impossible to achieve with low-quality aftermarket gears that are through-hardened and brittle.
Aftermarket ring gears often have inaccurate tooth profiles (incorrect module or pressure angle), causing noisy engagement and rapid starter pinion wear. Genuine 611600020005 is hobbed on precision gear hobbing machines, and each tooth is inspected for runout and pitch error. The interference fit diameter is held to H7 tolerance, ensuring a tight shrink fit onto the flywheel without risk of loosening during high-speed rotation.
Replacing a flywheel ring gear requires removing the flywheel from the engine. Heat the new ring gear evenly to 200–250°C using an induction heater or oven (never an open flame). The ring gear will expand sufficiently to slip over the flywheel shoulder. Quickly position the ring gear with the chamfered teeth facing the starter side. Allow it to cool naturally; the interference fit will lock it in place. Ensure the ring gear is seated flush against the flywheel step.
Do not hammer the ring gear onto the flywheel, as this can crack the gear or damage the flywheel. After installation, check that the ring gear does not wobble. For Shacman X5000, always replace the ring gear when the flywheel is removed for resurfacing, as the original ring gear may have uneven wear. Never reuse a ring gear that shows chipped or missing teeth.
Each 611600020005 ring gear is manufactured from continuously cast steel bar. After rough turning, the gear is hobbed on a CNC hobbing machine, then chamfered and deburred. Induction hardening is performed using a single-shot process with a copper coil, followed by tempering. The gear is then phosphate-coated and oiled to prevent rust.
100% of ring gears are tested for tooth profile using a double-flank gear tester (composite error ≤ 0.08 mm). Hardness is measured on the tooth flank using a portable hardness tester. A sample from each batch is sectioned to verify case depth. The inside diameter is air-gaged to ensure proper interference fit. Only gears passing all tests are packaged as genuine Shacman.
OEM 611600020005 replaces Shacman part numbers 611600020004, 612600010075, and DZ13241808013. It is fully compatible with Shacman X5000 flywheels (both OEM 611600020026 and 611600020027) and fits all WP12, WP13, and ISM engine variants. The same ring gear is also used on X3000 and X6000 models with 430 mm flywheels.
When replacing, also inspect the starter pinion gear for wear; a worn pinion can damage a new ring gear within days. Use a starter shim if necessary to ensure proper gear mesh clearance (0.5–1.0 mm backlash). For trucks used in cold climates (below -20°C), Shacman recommends checking the ring gear annually for tooth deformation due to high starter loads.
Fleet operators report that using genuine 611600020005 ring gears extends starter life by up to 50% due to the precise involute profile reducing meshing impact. Properly installed, this ring gear will last the life of the engine (over 1,000,000 km) unless damaged by a faulty starter. Invest in Shacman original parts for maximum reliability.
Shacman’s ring gear validation includes a 50,000-cycle starter engagement test on a dedicated rig. The starter is cycled at 200 rpm engagement speed with a 100 N·m load. After 50,000 cycles, the genuine 611600020005 shows less than 0.2 mm of tooth wear, and no cracks are found. A thermal shock test involves heating the ring gear to 250°C (simulating shrink-fit installation) then quenching in oil – repeated 20 times – with no dimensional change.
In field trials across 400 trucks in mining and construction, the OEM ring gear achieved a zero-failure rate up to 800,000 km, while aftermarket gears failed at an average of 250,000 km due to tooth stripping or fatigue cracks. By choosing genuine 611600020005, you eliminate starting issues and reduce roadside breakdowns.
