CAT 482-6727 50mm Inner Diameter Needle Bearing

CAT 482-6727 is a Caterpillar genuine needle roller bearing without an inner ring stamped cage (suitable for gearbox input shafts/balance shafts, compact radial structure, capable of withstanding large radial loads under heavy loads). It is used in heavy-duty equipment such as the Cat 793D mining truck gearbox, the D11T bulldozer drive axle balance shaft, and the 992K loader differential. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model: 482-6727, Type: Needle roller bearing without inner ring stamped cage (including needle rollers + stamped steel cage, suitable for Cat 793D mining truck gearbox input shaft, D11T bulldozer drive axle balance shaft, 992K loader differential half-shaft, 785D mining truck steering knuckle), Material: Needle rollers (SAE 52100 bearing steel, hardened to HRC 62-66), Cage (SAE 1010) Steel sheet stamping, galvanized surface; inner diameter 63.5 mm (2.5 inches, tolerance JS6, +0.025/-0.025 mm); outer diameter 82.55 mm (3.25 inches, tolerance h7, 0/-0.040 mm); width 25.4 mm (1 inch, tolerance ±0.20 mm); unit weight approximately 0.8 kg; rated radial load Cr≥180 kN; rated static load Cor≥220 kN; operating temperature -40℃ to +120℃; lubrication method: grease lubrication (NLGI 2 lithium-based grease) / oil lubrication (ISO VG 68 anti-wear gear oil); limiting speed (grease lubrication) ≤3000 rpm, (oil lubrication) ≤3600 rpm; radial clearance C2 group (0.020-0.040 mm); interference fit with shaft (interference 0.010-0.020 mm). (mm), clearance fit with housing bore (clearance 0.020-0.040 mm)

Key Dimensions: Needle roller diameter 4.76 mm (tolerance ±0.01 mm), number of needle rollers 32, cage window clearance 0.3-0.5 mm, needle roller length 22 mm (tolerance ±0.15 mm), mounting reference end face runout ≤0.05 mm, axial positioning via shaft shoulder + elastic retaining ring (or lock nut, torque 180-220 N・m)

Material and Process: Needle rollers are vacuum quenched + low-temperature tempered, surface ultra-precision ground (Ra≤0.2 μm), cage is an integral stamped and riveted structure, no risk of loosening, contact fatigue life ≥9000 hours (under rated load), impact load resistance ≥50 kN, repeat assembly accuracy ≤0.10 mm

Compatible Models: Cat 793D/785D mining truck gearbox input shaft, D11T/D10T Bulldozer drive axle balance shaft, 992K/988H loader differential half-shaft, 789D mining truck steering knuckle. Suitable operating conditions: radial load ≥150 kN, speed ≤2500 rpm, limited radial installation space (radial section height only 19.05 mm).

Assembly fit: Interference fit with shaft (interference 0.010-0.020 mm, cold/hot fitting both acceptable, hot fitting temperature 80-90℃); clearance fit with housing bore (clearance 0.020-0.040 mm); axial preload after installation 3-5 kN (to eliminate backlash and improve rigidity); radial runout ≤0.08 mm; axial movement ≤0.10 mm.

Installation and maintenance points: Clean bearings, journals, and housing bores before installation. Check bearings for rust and cage deformation. Journal surface hardness HRC 58-62, roughness Ra≤0.4. μm, housing bore roundness ≤0.05 mm, journal roundness ≤0.02 mm.

During assembly, use either a cold fitting method (press-in with a special tool) or a hot fitting method (80-90℃) to assemble the shaft components, ensuring uniform contact between the needle rollers and the journal. After installation, pre-tighten with a spring retaining ring or lock nut (torque 180-220 N・m). After hot fitting, allow it to cool naturally to room temperature before loading to avoid damaging the needle rollers during cold fitting.

Maintenance Recommendations: Check lubrication and wear every 1200 hours. When needle roller pitting/scratching, journal wear >0.10 mm, or clearance >0.15 mm, immediately replace the bearing and repair the journal (polish the surface to Ra≤0.4 μm) to prevent transmission failure.