CAT 9T-9527 Piston Pump Motor Bearing

CAT 9T-9527 is a Caterpillar single-row tapered roller bearing (including inner ring, outer ring, rollers and cage), suitable for medium- and high-speed, medium- and heavy-duty transmission parts such as Cat 320D/323D excavator slewing bearings, 950GC loader gearbox output shafts, and 140M grader drive axles. Its core function is to withstand combined radial and unidirectional axial loads, limit shaft movement, and transmit torque (Cat). The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 9T-9527, Single-row tapered roller bearing (non-separable type), suitable for 320D excavator slewing mechanism, 950GC loader gearbox, 140M grader drive axle, material is chromium bearing steel (GCr15, quenched HRC 60-64), operating temperature -40℃ to +120℃, single weight approximately 1.85 kg, suitable for oil lubrication, rated radial dynamic load ≥120 kN, rated axial dynamic load ≥85 kN, operating speed ≤3000 rpm, wear life ≥8000 hours, used for combined load bearing and positioning in transmission parts, preventing axial movement Cat

Key Dimensions
Inner diameter 65.00 mm (2.559 in, tolerance P6, +0.010/-0.015 mm), outer diameter 120.00 mm (4.724 1.142 in (tolerance P6, +0.015/-0.025 mm), total width 29.00 mm (1.142 in, tolerance ±0.15 mm), rolling element diameter 10.5 mm, cage made of stamped steel plate, outer ring cone angle 12°, inner ring large end chamfer C2.0 mm, outer ring two ends chamfer C1.5 mm, inner hole roughness Ra≤0.8 μm, suitable for standard journals and bearing housings.

Material and Process: GCr15 chromium bearing steel → forging → spheroidizing annealing → rough turning → finish turning → quenching (860℃ oil quenching) → low temperature tempering (180℃ holding for 2h) → precision grinding → ultra-precision grinding → assembly → rust prevention treatment. It possesses high hardness, high wear resistance, and good dimensional stability, suitable for medium-high speed and medium-heavy load Cat bearings.

Compatible Models: Cat 320D/323D/326D excavator slewing bearings, 950GC/966K The output shaft of the loader gearbox, the drive axle of the 140M/160M grader, and the transmission system of the 420D skid steer loader are used to withstand combined radial and unidirectional axial loads, ensuring smooth operation of the transmission components and extending the life of the shaft system. Cat. Assembly fit: Suitable for 65.00 mm diameter journals (tolerance k5, +0.012/+0.002 mm), 120.00 mm diameter bearing housing bores (tolerance H7, +0.035/0 mm), interference fit 0.002-0.012 mm (journal to inner ring), clearance fit 0.015-0.035 mm (outer ring to bearing housing). Hot fitting (oil temperature 80-90℃) or cold fitting is acceptable. Do not hammer during installation. Radial runout after installation ≤0.02 mm. Installation and Maintenance Points (mm) Before installation, clean the journal, bearing housing bore, and bearing. Inspect the surfaces for scratches, rust, and dents. Measure the inner diameter of the journal and inner ring, and the outer diameter of the bearing housing bore and outer ring to ensure the interference fit and clearance meet requirements. The surface roughness of the bearing housing bore should be Ra≤1.6 μm.

Use the hot mounting method (immerse the bearing in clean machine oil at 80-90℃ for 20-30 minutes). Use a special tool to vertically press it into the journal, ensuring the bearing end face fits snugly against the shaft shoulder. For the cold mounting method, use a hydraulic nut to evenly press it in. Do not use a hammer to directly strike the bearing outer ring or cage to prevent deformation and damage to the rollers.

Maintenance Recommendations: Check the bearing clearance every 2000 hours. Replace immediately if the radial clearance is >0.15 mm or if abnormal noise or temperature rise occurs. Use ISO VG 46 hydraulic oil for daily lubrication, maintaining the oil level at the center of the lowest rolling element. Check the oil quality every 500 hours and replace the filter element regularly to prevent impurities from entering the bearing.