CAT 547-5487 88.9mm Inner Diameter Taper Bearing

CAT 547-5487 is a Caterpillar genuine single-row tapered roller bearing (imperial size, inner diameter 88.9mm/3.5 inches, suitable for heavy-duty differentials/transmission output shafts), used in heavy-duty equipment such as the Cat 793D mining truck differential, D11T bulldozer drive axle, and 992K loader transmission. It can withstand both radial and unidirectional axial loads simultaneously. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 547-5487, Type Single-row tapered roller bearing (imperial single-row, including inner ring/outer ring/rollers/stamped steel cage, suitable for Cat 793D mining truck differential half-shaft, D11T bulldozer drive axle main reducer, 992K loader transmission output shaft, 785D mining truck balance shaft), Material is inner ring/outer ring/rollers (SAE) Bearing steel 52100, hardened to HRC 62-66; cage (SAE 1010 steel sheet stamping, galvanized); inner diameter 88.9 mm (3.5 inches, tolerance JS6, +0.025/-0.025 mm); outer diameter 139.7 mm (5.5 inches, tolerance h7, 0/-0.040 mm); width 38.1 mm (1.5 inches, tolerance ±0.25 mm); unit weight approximately 3.6 kg; rated radial load Cr≥240 kN; rated static load Cor≥280 kN; contact angle 15° (unidirectional axial load ≈ 60% radial load); 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) ≤2200 rpm. rpm, (oil lubrication) ≤2800 rpm, radial clearance C2 group (0.025-0.050 mm), interference fit with shaft (interference 0.015-0.030 mm), clearance fit with housing bore (clearance 0.025-0.050 mm)

Key Dimensions: Roller large end diameter 14.0 mm (tolerance ±0.02 mm), number of rollers 20, cage window clearance 0.4-0.6 mm, inner ring flange height 8.0 mm (tolerance ±0.15 mm), outer ring raceway cone angle 15° (tolerance ±0.5°), logarithmic curve of roller crown (to reduce edge stress), mounting reference end face runout ≤0.05 mm, axial positioning by shaft shoulder + lock nut (torque 280-320 N・m)

Material and Process: Inner ring/outer ring vacuum hardened + Low-temperature tempering, ultra-precision grinding of raceways (Ra≤0.2 μm), roller crown design (uniform distribution of contact stress), cage is an integral stamped and riveted structure, eliminating the risk of loosening, contact fatigue life ≥8000 hours (under rated load), impact load resistance ≥50 kN, repeat assembly accuracy ≤0.12 mm. Compatible models: Cat 793D/785D mining truck differential half-shaft, D11T/D10T bulldozer drive axle main reducer, 992K/988H loader gearbox output shaft, 789D mining truck balance shaft bearing housing. Suitable operating conditions: radial load ≥200 kN, speed ≤2000 rpm. Replaces traditional ball bearings to improve composite load tolerance. Assembly fit: interference fit with shaft (interference 0.015-0.030 mm, hot fitting temperature 90-110℃), clearance fit with housing bore (clearance 0.025-0.050 mm). (mm), axial preload after installation: 5-8 kN (to eliminate clearance and improve rigidity), radial runout ≤0.08 mm, axial runout ≤0.10 mm, recommended mating bearings: 547-5488 (same size, reverse installation, to withstand bidirectional axial loads).

Installation and Maintenance Points:

Before installation, clean the bearings, journals, and housing bores. Check for rust on the bearings and deformation of the cage. 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 the hot fitting method (90-110℃) to assemble the shaft components. Use a special tooling to guide the insertion into the hole, ensuring uniform contact between the rollers and raceways. After installation, pre-tighten with locknuts (torque 280-320 N・m). After hot fitting, allow to cool naturally to room temperature before loading to avoid damage to the raceways from cold fitting.

Maintenance recommendations: Check lubrication and wear every 1200 hours. If roller pitting/scratching, raceway wear > 0.12 mm, or clearance > 0.15 mm, replace the bearing immediately and repair the journal (polish the surface to Ra ≤ 0.4 μm) to prevent transmission failure.