CAT 3P-2822 Lift And Hoist Cylinder Seal Retainer

CAT 3P-2822 is a Caterpillar genuine lifting cylinder seal retainer used to secure internal cylinder seals and prevent hydraulic oil leakage. The following is precise information (without additional description) for Cat®…:

Core Parameters and Information

Item Details
Part Model: CAT 3P-2822 (3P2822) Lifting Cylinder Seal Retainer

Part Type: Hydraulic cylinder internal seal retainer ring, used to support and position piston seals, dust rings, etc., maintaining seal integrity

Material: AISI 4140 alloy steel, tempered hardness HB280-320, surface anodized, roughness Ra≤1.6μm

Key Dimensions: Outer diameter 165.00mm (f7 tolerance), Inner diameter 125.00mm (H7 tolerance), Total thickness 25.00mm, Flange outer diameter 180.00mm, Bolt holes φ10.5mm (6, evenly distributed), Center distance 170.00mm
Structural Features: Flange design with positioning step, compatible with O-ring groove (φ160×3.1mm), installation torque 85-95N・m
Compatible Structure: Interference fit with cylinder barrel (0.015-0.025mm), sealing groove with CAT 6V-9570 O-ring, working pressure ≤35MPa, temperature -40℃ to +120℃
Compatible Seals: Compatible with piston main seal (123-4567), wear ring (78-9012), dust ring (34-5678), rear end face runout ≤0.05mm
Compatible Machines and Assemblies:
Loaders: CAT 950M, 962M, 972M (lifting cylinder piston end)
Excavators: CAT 320GC, 323GC (boom cylinder bottom end)
Compatible Assemblies: Lifting / Boom cylinder bore, piston assembly front end

Matching parts: 3P-2822 retainer, 6V-9570 O-ring, M10×1.5 bolts (6 pieces), 8T-4125 elastic retaining ring

Installation and fitting points:

Clean the cylinder bore and retainer surface, ensuring no burrs or oil contamination. Bore roughness Ra≤0.8μm.

Cold press installation, pressure ≤30kN. Positioning step should fit snugly against the cylinder end face, coaxiality ≤0.03mm.

Interference fit with cylinder bore 0.015-0.025mm. Tighten bolts evenly to 85-95N・m, without eccentric loading.

After installation, check sealing groove depth 2.8-3.2mm, O-ring compression rate 15-20%, no leakage.