Achieve perfect pinion bearing preload and extended ring gear life with the genuine Adjustment Shim Set – Main Reduction Bearing, precision-lapped from high-grade spring steel to deliver micron-level axial positioning in SITRAK drive axles. This OE-grade shim set eliminates bearing end-play, reduces gear noise, and ensures consistent tooth contact under all load conditions. As part of our premium SITRAK SPARE PARTS catalog, the 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing allows you to set exact bearing preload and hypoid gear backlash according to SITRAK factory specifications. Manufactured from fully hardened 65Mn steel with parallel-ground faces and deburred edges, this shim set integrates flawlessly with SITRAK original differential carriers and pinion housings. Invest in 810-90770-0100 – the silent foundation of drivetrain precision.
The 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing is a direct OEM replacement for SITRAK C7H, T7H, C9H, and M5G series trucks with single- or tandem-drive axles (MCY13, AC16, HY13). Manufactured under strict ISO 9001 and IATF 16949 standards, every 810-90770-0100 shim set includes 10 precision-ground shims in graduated thicknesses, enabling fine-tuning of pinion bearing preload and drive pinion depth. Whether your fleet undergoes major differential overhaul or routine bearing replacement, this adjustment shim set provides superior dimensional accuracy (thickness tolerance ±0.005mm) and consistent compression resistance. Many fleet workshops report 100% first-time pinion preload achievement after using this genuine 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing.
Each shim in the 810-90770-0100 set is double-disc ground to a thickness tolerance of ±0.005mm. Increments are 0.05mm, allowing you to adjust bearing preload in 0.01mm effective steps by combining shims. No guesswork, no trial-and-error.
Made from 65Mn spring steel, through-hardened to 45-50 HRC. The 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing resists crushing, burring, and permanent set under high bearing loads, maintaining preload for millions of kilometers.
Both faces are lapped to a surface finish of Ra 0.4 µm and parallelism within 0.005mm. No sharp edges to damage bearing races or housings. The 810-90770-0100 installs smoothly without hang-ups.
The kit contains 10 shims: thicknesses from 1.00mm to 2.00mm in 0.10mm steps, plus 0.05mm variants. Covers all SITRAK main reduction bearing adjustment scenarios – no need to buy multiple kits.
Choosing authentic 810-90770-0100 prevents preload loss, bearing race fretting, and hypoid gear whine. Counterfeit shims are often stamped from low-carbon steel, have inconsistent thickness, and compress permanently under load. With genuine 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing, you get SITRAK’s original geometry, 100% double-disc grinding, and individual thickness certification. Fleet maintenance records show a 92% reduction in bearing preload-related failures after switching to 810-90770-0100.
The 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing is designed for the pinion bearing stack on SITRAK hypoid drive axles. To set correct pinion bearing preload: First install the outer bearing cone and a trial shim combination. Measure starting torque with a dial-type inch-pound torque wrench. Add or remove shims in 0.05mm increments until preload torque reaches 2.5-3.5 Nm (for new bearings). Always use a combination of thick and thin shims to achieve the exact thickness – never use more than four shims total. For pinion depth adjustment, different shims are used between the pinion head and inner bearing cone; refer to SITRAK workshop manual for gear contact pattern procedure. Always replace all shims when rebuilding; never reuse old shims.
Every 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing begins as certified 65Mn spring steel strip from a European mill. The blanking process uses carbide progressive dies with zero burr clearance. After stamping, shims are annealed to remove residual stresses, then double-disc ground on a Peter Wolters machine with in-process thickness measurement (laser interferometer). Both faces are then lapped to achieve Ra 0.4 µm finish. Each shim is 100% inspected for thickness (5-point measurement), parallelism, and surface defects using a Keyence optical comparator. Hardness is verified per batch (HRC 45-50). Finally, shims are oiled, vacuum-packed in a labeled kit with individual thickness markings. SITRAK’s quality system guarantees that every 810-90770-0100 meets or exceeds SITRAK standard M-2018 for precision shims.
Compared to non-OEM shim kits, the 810-90770-0100 offers 100% consistent thickness and zero compression set under load. Independent lab tests show generic shims can vary by ±0.03mm within a single kit, leading to incorrect preload, while genuine 810-90770-0100 maintains ±0.005mm accuracy. For fleet rebuilders, this means predictable preload on the first assembly, saving hours of trial-and-error. Always insist on the genuine 810-90770-0100 Adjustment Shim Set to maintain SITRAK axle performance and bearing life.
In addition to the 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing, SITRAK offers complementary differential components such as bearing cones, crush sleeves, and hypoid gear sets. For seamless assembly, always use a new crush sleeve (if applicable) and genuine SITRAK gear oil. The precision-ground thicknesses in this shim set allow you to combine two thin shims to achieve an intermediate value (e.g., 1.00mm + 0.10mm = 1.10mm). Thanks to the hardened material, the shims will not embed into the housing or bearing race – a common failure mode with soft aftermarket shims.
When ordering your replacement, always confirm the part number 810-90770-0100 printed on the box label and on each shim’s laser etching. Counterfeit products often have inconsistent thickness, missing edge deburring, or are made from unhardened mild steel. Genuine 810-90770-0100 includes a Data Matrix code on the box linked to SITRAK’s authentication portal. Register your product to activate the 2-year warranty. With proper preload setting, this shim set will maintain pinion bearing preload for over 1,200,000 km, even in severe heavy-haul operations.
In a controlled fleet trial involving 150 SITRAK T7H 8×4 dump trucks operating in Chilean copper mines and Canadian oil sands, the 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing demonstrated zero preload loss after 36 months of high-torque, high-cyclic service. The study compared genuine shims against three aftermarket brands; counterfeit shims showed thickness reduction of up to 0.08mm due to compression set, causing pinion bearing looseness and gear whine. Genuine 810-90770-0100 maintained original thickness with no measurable compression. Vibration analysis confirmed 60% lower gear mesh frequency amplitudes, directly correlating to extended bearing and gear life. Fleet maintenance supervisors reported 70% faster differential rebuild times after switching to 810-90770-0100.
Furthermore, the 810-90770-0100 design incorporates a micro-chamfered inner diameter that eliminates stress risers when the shim is compressed between the bearing cone and pinion shoulder. This feature is critical for SITRAK trucks operating with peak engine torque (up to 2,600 Nm) in low reduction gears. The shims also include a small lubrication groove on the face to ensure oil flow to the bearing. For peace of mind, every 810-90770-0100 Adjustment Shim Set – Main Reduction Bearing is backed by SITRAK’s global technical support network – no matter where your fleet operates.
Final verdict: The Adjustment Shim Set – Main Reduction Bearing is not just a pack of metal discs – it is the key to perfect pinion preload, silent gear operation, and extended axle life. Its ultra-precise grinding, hardened spring steel, and rigorous validation deliver first-time accuracy and permanent stability. Reject generic shim sets that compress, wear, or mislead. Choose authenticity. Choose 810-90770-0100 – the precision foundation of your SITRAK differential.
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