CAT 8P-1715 92mm Inner Diameter Bearing Retainer

CAT 8P-1715 (8P1715) is a Caterpillar bearing retainer, also commonly known as a “bearing locating retainer/shaft retainer”. It is primarily used for axial positioning and anti-loosening of bearings in the final drive, wheel hub, gearbox, or engine of construction machinery. It is compatible with wheel hub bearings, planetary gear bearings, and crankshaft/camshaft bearing end caps of models such as CAT 320D/336D excavators, 980G loaders, and D8T bulldozers, preventing axial movement and loosening of bearings on the shaft and ensuring stable operation of the transmission system. Here is the core information:

Core Technical Parameters
Item Details
Part Model: CAT 8P-1715 (8P1715) Bearing Retainer, Shaft Positioning Type, with Bolt Holes/Claw Structure
Material: 40Cr/42CrMo Alloy Steel, Integral Quenching + Tempering (HRC 38–45), Blackened/Zinc-plated Surface, Corrosion Resistant
Key Dimensions: Inner Diameter 101.6 mm (4.0 in), Outer Diameter 139.7 mm (5.5 in), Thickness 12.7 mm (0.5 in), Number of Bolt Holes: 6, Hole Diameter: 11.1 mm, Bolt Size: M10×1.5, Single Weight: Approx. 1.0 kg
Compatible Models: CAT 320D/323D/336D Excavators, 980G/982G Loaders, D8T/D9R Bulldozers, 777D Suitable for mining trucks, etc., and compatible with final drive hub bearings, planetary carrier bearings, engine crankshaft front/rear bearings, and gearbox output shaft bearings.

Core Functions: Axial positioning and anti-loosening of bearings; withstands vibration and impact; prevents inner/outer ring displacement; suitable for heavy-load/high-frequency vibration conditions.

Core Functions and Structural Features:

Axial Positioning and Anti-Movement: Secured to the shaft end or bearing housing with bolts, limiting axial displacement of the bearing and preventing damage to the bearing raceway, abnormal noise, or seizing due to movement.

High Strength and Impact Resistance: Made of 40Cr/42CrMo material, heat-treated with a tensile strength ≥900 MPa, capable of withstanding vibration and impact in engineering machinery transmission systems, and resistant to deformation and breakage.

Corrosion and Wear Resistance: Blackened/galvanized surface treatment enhances rust resistance, suitable for harsh working conditions such as dust and mud, extending service life.

Easy Assembly: Equipped with positioning stops and bolt holes for quick positioning during installation; after bolt tightening, it fits tightly against the bearing end face, ensuring precise positioning and facilitating disassembly and maintenance.

Installation and Maintenance Points

Installation Specifications
Clean the retainer, bearing end face, and shaft/bearing housing to remove burrs, metal shavings, and oil stains, ensuring the mating surfaces are flat and free of debris.

Tighten with M10×1.5 bolts, controlling the torque to 45–55 N・m. Tighten in a diagonal sequence to prevent uneven stress that could cause deformation.

After assembly, check the bearing axial clearance, controlling it to 0.02–0.05 mm. Avoid excessive clearance causing movement or insufficient clearance causing overheating.

Maintenance Recommendations
Inspect every 1000–2000 working hours: Check the retainer for cracks, loose bolts, and surface corrosion. Replace or tighten immediately if any problems are found.

If used in high-temperature applications such as final drives, regularly check the fit between the retainer and bearing to prevent clearance changes due to thermal expansion and contraction.

When replacing, prioritize original equipment manufacturer (OEM) or equivalent quality retainers, ensuring material hardness, dimensional accuracy, and bolt hole positions meet standards to prevent positioning failure after installation.