Description
CAT 1S-3206 Drawn Cup Needle Roller Bearing
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The CAT 1S-3206 is a Caterpillar perforated stamped outer ring needle roller bearing (without an inner ring), suitable for gearboxes, balance shafts, or rocker arm shafts in Cat 3206/3208 engines, D6/D7 bulldozers, and other equipment. It is used in applications where radial loads are predominant and installation space is limited. The following is professional structured information.
Core Parameters (Professional Version)
Item Details
Basic Attributes Model 1S-3206, Quantity per unit 1–4 pieces (depending on location), no inner ring (shaft diameter is inner raceway), compatible shaft diameter φ35 mm (tolerance h6: 0–-0.016 mm), unit weight 0.18 kg, cold radial clearance 0.015–0.03 mm, perforated type without seal (requires additional oil seal)
Key Dimensions Inner diameter (needle roller inscribed circle) φ35 mm (tolerance F8: +0.053–+0.097 mm), outer diameter φ47 mm (tolerance 0–-0.02 mm), width 22 mm (tolerance ±0.1 mm), outer ring wall thickness 1.2 mm, needle roller diameter φ3 mm, number of needle rollers 12, cage groove width 3.1 mm
Material and Process Outer ring is ST12 Precision stamping of low-carbon steel, with galvanized passivation (for corrosion protection); needle rollers are made of GCr15 bearing steel, HRC 62–65, with a hardened layer ≥0.8 mm; the cage is made of 08F steel plate, stamped and phosphated; needle roller crown design (0.01–0.02 mm) to reduce end stress.
Performance Parameters: Rated dynamic load 28.5 kN, rated static load 32.2 kN, grease lubrication limiting speed 6000 rpm, oil lubrication 8000 rpm, operating temperature -40℃ to +120℃, fatigue life ≥15000 hours (standard operating conditions).
Compatible Models: Cat 3206/3208 diesel engine (balance shaft/rocker arm shaft), D6/D7 bulldozer gearbox (input shaft bearing), 950 loader steering system (steering cylinder piston pin), compatible bearing housing bore φ47 H7 (0–+0.025 mm). (mm)
Installation and Maintenance Points:
Clean the journal and bearing housing bore before installation. The journal surface roughness Ra≤0.4 μm, free of scratches/burrs. The bearing housing bore should be bored to φ47 H7 with a pressing force ≤8 kN. Use a special sleeve to press in evenly, and do not strike the outer ring.
Clearance Control: After pressing in, use a tapered plug gauge to measure the inscribed circle of the needle roller, ensuring a clearance of 0.015–0.03 mm with the shaft diameter. If the clearance is too small, grind the journal; if it is too large, replace the bearing.
Lubrication Requirements: Apply lithium-based grease (NLGI 2 grade) before installation. During operation, continuous oil lubrication (pressure ≥50 kPa) or periodic grease replenishment (every 500 hours) is required. Avoid dry friction.
Troubleshooting: If abnormal noise/temperature rise occurs, first check for journal wear (>0.05 mm requires repair), insufficient lubrication, or outer ring deformation. If necessary, replace the bearing and repair the housing bore.
