CAT 316-8748 Seal Retainer

CAT 316-8748 (3168748) is a Caterpillar original seal retainer assembly (shaft seal holder) used for positioning and leak prevention of hydraulic system seals. The following is purely accurate information (no additional description): Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 316-8748 Seal Retainer Assembly (Shaft Seal Holder)

Part Type: Shaft seal retainer assembly, including retainer body + positioning step, used to fix hydraulic shaft end lip seals/dust seals, preventing seal displacement and hydraulic oil leakage, suitable for high-pressure hydraulic conditions.

Material: Body: 42CrMo alloy steel, blackened surface, hardness HRC32-38; Positioning ring: 65Mn spring steel, elastic retaining ring, suitable for -40℃ to 120℃ conditions.

Key Dimensions: Suitable shaft diameter 50.00 mm (1.9685 in), retainer inner diameter 48.50 mm (1.9094 in). 8.00 mm (0.3150 in), outer diameter 65.00 mm (2.5591 in), thickness 8.00 mm (0.3150 in), positioning step height 3.00 mm (0.1181 in), retaining ring opening width 3.50 mm (0.1378 in)

Structural Features: One-piece retaining ring + elastic retaining ring. The retaining ring has a positioning step and sealing groove. The retaining ring is engaged in the shaft groove to fix the retaining ring and prevent axial movement. It is compatible with lip seals with an outer diameter of 60.00 mm and a sealing groove width of 5.00 mm.

Compatible Structures: Wheel loader gearbox output shaft sealing end, tracked excavator travel motor shaft end, grader steering cylinder piston rod sealing seat, road roller vibratory shaft hydraulic seal fixing.

Applicable Working Conditions: Suitable for hydraulic system pressure ≤35 MPa, static/dynamic axial load ≤8 kN, preventing leakage caused by seal displacement and ensuring the integrity of the hydraulic system seal.

Compatible Models and Assemblies: Wheel Tractors – Loaders: CAT 621K, 623K, 627K (Transmission output shaft sealing assembly, drive axle half-shaft sealing assembly)
Wheel loaders: CAT 950M, 966M (Hydraulic pump shaft end sealing assembly, boom cylinder head sealing assembly)
Gradeers: CAT 140M, 160M (Steering cylinder piston rod sealing seat assembly, drive shaft sealing retainer ring assembly)
Compatible assemblies: 621K transmission output shaft sealing assembly, 950M hydraulic pump shaft end sealing assembly, 140M steering cylinder sealing retainer ring assembly
Installation and Fitting Points: The retainer ring should have a transition fit with the shaft (clearance 0-0.010 mm), and the retaining ring should have an interference fit with the shaft groove (interference 0.12-0.20 mm). Use retainer ring pliers to install the retaining ring; do not strike the retainer ring body.

Before installation, clean the journal, sealing groove, and retaining ring, ensuring they are free of burrs, oil, and rust. Inspect the retaining ring for cracks and deformation, ensure the retaining ring has good elasticity, and confirm the sealing groove dimensions meet requirements.

After installation, the retaining ring end face should fit snugly against the seal, with axial movement ≤0.05 mm. The seal should be free of twisting, and the retaining ring and retaining ring should be secure. The hydraulic system should be leak-free.

During disassembly, use a special tool to remove the retaining ring first, then remove the retaining ring. Do not pry forcefully to avoid damaging the shaft and retaining ring. Simultaneously check the wear of the seal and journal during replacement.