CAT 055-1729 BEARING

CAT 055-1729 is a Caterpillar genuine single-row tapered roller bearing (pure original factory information, no additional description), compatible with the 352-0618 high-pressure axial piston pump and the C7/C9 engine fuel pump drive end. It is used to withstand radial and unidirectional axial combined loads, limit shaft movement, and ensure pump/engine transmission accuracy and stable operation. It is used in conjunction with the 054-7306 retainer and the 054-4003 oil retainer ring.

Core Parameters and Information

Item Details
Part Model: CAT 055-1729 (0551729) Bearing

Type: Single-row tapered roller bearing (separate: inner ring/roller assembly + outer ring), contact angle 15°, suitable for radial + unidirectional axial load conditions

Material: Inner/outer ring: Chromium-molybdenum alloy steel (CrMo4) hardened to HRC60-64; Rollers: High carbon chromium bearing steel (GCr15), Cage: Stamped low carbon steel, Weight: 0.42 kg

Key Dimensions: Inner diameter 45 mm, outer diameter 75 mm, width 19 mm, number of rollers 12, roller diameter 8.5 mm, raceway cone angle 15°, suitable journal diameter 45 mm

Operating Parameters: Rated radial dynamic load 42 kN, rated axial dynamic load 28 kN, rated static load 55 kN, limiting speed 6000 rpm, operating temperature -30℃ ~ +120℃
Installation Method: Inner ring interference fit (interference 0.015-0.035 mm), outer ring transition fit. When installed in pairs, face-to-face/back-to-back arrangement. Axial clearance after installation: 0.05-0.10 mm.
Compatible Models and Assemblies
Compatible Parts: 054-7306 retainer, 054-4003 oil retainer ring, 352-0618 main pump drive shaft, 053-6530 bearing, 054-6734 bushing
Compatible Equipment: CAT 320D/323D/329D excavators, 950H/966H loaders, D6R/D7R bulldozers, etc., equipped with C7/C9 engines. Compatible with 352-0618 hydraulic pump and C7/C9 fuel pump drive end.
Matching Parts: 055-1729 Bearings, 054-7306 retainer, 054-4003 oil retainer ring, 053-5760 return spring, 053-5758 plunger
Installation and Maintenance Points
**Before installation, clean the journal and bearing housing bore, ensuring no burrs or rust. Check the bearing raceway for scratches, ensure the rollers rotate freely, and check the cage for deformation.

Heat the inner ring to 80-100℃ and heat-fit (or cold-press) it onto the journal. Install the outer ring into the bearing housing. When installing in pairs, adjust the contact angle to ensure an axial clearance of 0.05-0.10 mm.

After installation, manually rotate the shaft system. There should be no jamming or abnormal noise. Measure radial runout ≤0.05 mm. Position the bearing with the 054-7306 retainer, ensuring a tight, gap-free fit between the bearing end faces.

Maintenance: Check bearing temperature (≤80℃) and abnormal noise every 2000 working hours. Disassemble and check raceway wear every 5000 hours. Replace immediately if peeling or cracks are found to avoid damage to the shaft system.