CAT 141-9865 CAP BRG

CAT 141-9865 is a Caterpillar hydraulic motor end cap bearing cover, which is suitable for bearing positioning and sealing in equipment such as skid steer loader drive motors and small road roller vibration motors. Its core function is to fix the outer ring of the bearing, prevent contaminants from entering, and assist in bearing heat dissipation. It is a key protection and positioning component of the hydraulic transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 141-9865, Type: End-cap type bearing cover (integrated positioning boss + sealing groove), Material: Cast steel (ZG270-500, tensile strength ≥500 MPa), Surface: Zinc-plated passivation (corrosion resistance grade ≥8), Single weight: Approximately 0.68 kg, Suitable temperature: -40℃ to +120℃, Sealing method: Nitrile rubber (NBR) O-ring, Installation method: Bolt fastening

Key Dimensions
Bearing positioning inner diameter: 68 mm (suitable for CAT 141-3049 bearing outer diameter, tolerance H7, 68.00-68.03 mm), Bolt hole diameter: 10 mm (4 evenly distributed, pitch circle diameter 85 mm, tolerance ±0.1 mm), Cover thickness: 15 mm (tolerance ±0.1 mm), O-ring groove diameter: 72 mm, width: 2.5 mm mm, positioning boss height 5 mm
Compatible Models and Locations: Compatible with Cat 247/257/267/277/287 series skid steer loader drive motors, CB-545 small compactor vibratory motors, and AP-500E asphalt paver travel motors. One piece per motor, used to fix the outer ring of the 141-3049 cylindrical roller bearing and seal the clearance between the motor housing and the output shaft.

Performance Parameters: Bolt tightening torque 25-30 N・m, O-ring compatibility pressure ≤2.5 MPa, hydraulic oil compatibility (Cat HYDO 10/ISO VG 46), shock load resistance ≥10 kN, service life ≥8000 hours (normal maintenance)

Structural and Performance Advantages: Integrated positioning and sealing: Integrates the bearing positioning boss and O-ring sealing groove, which not only fixes the bearing outer ring to prevent axial movement, but also seals the hydraulic oil and external contaminants through the O-ring, simplifying the motor housing structure.

High-strength Material: Constructed from cast steel, this material boasts high tensile strength, making it suitable for the impact conditions of frequent start-stop hydraulic motors. Galvanized passivation surface treatment enhances corrosion resistance, making it suitable for harsh outdoor environments in engineering machinery.

Heat Dissipation Assist Design: Heat dissipation fins on the side of the cover accelerate heat dissipation from bearing operation, reducing bearing operating temperature and extending the service life of the bearing and hydraulic oil.

Easy Installation: Four evenly distributed bolt holes ensure high positioning accuracy. No additional adjustments are needed during installation; simply tighten the bolts to complete positioning and sealing, improving maintenance efficiency.

Installation and Maintenance Points: Before installation, clean the bearing cover sealing groove, positioning boss, and motor housing end face, checking for burrs and cracks. Install the O-ring (model 167-2542, diameter 72 mm × cross-section 2.5 mm), applying a small amount of hydraulic oil for lubrication. Tighten the bolts diagonally (25-30 N·m) with a torque wrench, ensuring a tight, gap-free fit.

Maintenance every 2000 hours: Check bolt tightening torque, O-rings for aging or damage, and bearing caps for deformation; if O-rings fail, replace them promptly to prevent hydraulic oil leakage and bearing contamination.

Prioritize genuine parts. Aftermarket parts may have insufficient dimensional accuracy or material strength, easily leading to bearing positioning deviations, seal failure, and motor jamming and malfunctions.