CAT 389-5335 Exhaust Manifold Spacer

CAT 389-5335 is a Caterpillar genuine precision adjusting shim/sealing gasket, suitable for excavator/loader gearbox axle bearing end caps, differential bearing housings, or hydraulic pump flanges. It is used for sealing against leaks and compensating for axial clearance. Each piece weighs approximately 0.03 kg, and 1-2 pieces are used per workstation. The following is professional structured information from Cat® Parts:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes: Model 389-5335, flat gasket, outer diameter φ65 mm, inner diameter φ42 mm, thickness 1.5 mm (tolerance ±0.05 mm), material is low carbon steel (SPCC) + nitrile rubber (NBR) composite layer, operating temperature -30℃ to +100℃

Key Dimensions: Number of bolt holes: 6, evenly distributed diameter φ55 mm, hole diameter φ8.5 mm (compatible with M8 bolts), chamfered edges 0.5×45°, flatness ≤0.03 mm, surface roughness Ra≤1.6 μm

Material and Process: Metal substrate thickness 1.2 mm, rubber coating thickness 0.15 mm (double-sided), rubber hardness 70 Shore A, tensile strength ≥10 MPa, compression rebound rate ≥45%, oil resistance conforms to SAE J200 standard, salt spray test ≥48 hours

Compatible Models: Compatible with the gearbox second shaft bearing end cover seal of Cat 320GC/330GC excavators and 938K/950GC loaders, or the hydraulic pump flange face seal of C4.4/C7.1 engines; also used for adjusting the clearance between the differential bearing housing and the housing.

Assembly and Fit: The sealing surface must be clean, free of oil and scratches; bolt preload torque 12-15 N・m; compression amount controlled between 0.2-0.3 mm, ensuring a tight, leak-free seal.

Installation and Maintenance Points:
**Before installation, check that the gasket is free from deformation and damage, and that the sealing surface is clean and free of foreign matter.** It is recommended to use Cat 5P-3931 sealant for auxiliary sealing, applying a thickness of 0.1-0.2 mm.

Tighten the bolts symmetrically and evenly, in 2-3 stages to achieve the specified pre-tightening torque, avoiding uneven stress that could cause gasket deformation and leakage.

Maintenance Cycle: Check the sealing surface for leaks every 1500 hours. Replace the gasket immediately if it is found to be aged, damaged, or deformed. It is recommended to replace the gasket during a major overhaul of the transmission/differential to ensure sealing performance.