CAT 391-9813 BEARING-SLV-GD

CAT 391-9813 YM is a Caterpillar hydraulic valve manifold mounting base assembly, adapted for mounting the main control valves/auxiliary valves of Cat 305.5-308 mini excavators and 420F2/430F2 loaders. It is used to fix the valve manifold and provide hydraulic port integration and sealing interfaces, and is a key structural component for the stable operation of the hydraulic system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 391-9813 (YM = Custom Installation Interface), Type: Valve Manifold Base Assembly, Material: Cast Aluminum ZL109 (Anodized) + Nitrile Rubber Sealing Gasket, Weight: Approx. 2.8 kg, Applicable Temperature: -40℃ to +120℃, Sealing Standard: SAE J518, Installation Method: Bolt Fastening (M12×1.75, Torque 45-50 N・m), Surface Treatment: Anodized + Teflon Coating, Compatible Valve Manifold Models: 391-9820, 391-9821

Key Dimensions
Base Length: 245 mm (Tolerance ±0.20 mm), Width: 180 mm (Tolerance ±0.15 mm), Height: 42 mm (Tolerance ±0.10 mm), Mounting Hole Center Distance: 160 mm × 220 mm, Port Specification: P/T Port 1-1/4″ NPT, working port 1″ NPT, locating pin diameter 12 mm (tolerance +0.01/+0.005 mm), sealing groove depth 3.2 mm, sealing groove width 5.8 mm, base flatness ≤0.05 mm, aluminum hardness HB90-110. Compatible Machines and Applications: Compatible with Cat 305.5E2, 306E2, 307E2, 308E2 excavators, 420F2, 424F2, 430F2, 432F2 loaders. Mounted on the main control valve mounting surface and auxiliary hydraulic valve integrated base. Matching gaskets 391-9814, bolts 9X-3421, locating pins 7X-1234. 1-2 pieces required per machine. Performance Parameters: Rated working pressure 35 MPa, peak pressure 42 MPa, flow rate ≤120. L/min, sealing leakage ≤0.01 mL/min, vibration tolerance 10-2000 Hz (acceleration ≤10 g), impact tolerance ≤50 g, salt spray test ≥480 hours, bolt tensile strength ≥8.8 grade

Structural and Performance Advantages

Cast Aluminum Lightweight Design: ZL109 cast aluminum balances strength and lightweight, reducing weight by approximately 40% compared to cast iron bases. Anodizing + Teflon coating enhances corrosion resistance, suitable for outdoor humid conditions, reducing equipment weight and energy consumption.

Integrated Sealing Interface: Built-in nitrile rubber sealing gasket (hardness 70 Shore A), oil port thread uses NPT tapered thread + sealant double sealing, reducing the risk of hydraulic oil leakage and suitable for stable operation of high-pressure hydraulic systems.

Precise Positioning and Installation: Dual positioning with locating pins + bolts, strict control of mounting hole center distance tolerance ensures valve assembly and base coaxiality ≤0.05 mm, reducing vibration displacement under hydraulic shock and extending the life of valve assembly and seals.

Modular Integration: Adaptable to multiple valve assemblies, supports auxiliary hydraulic valve expansion installation, simplifies hydraulic pipeline layout, improves maintenance convenience, reduces the number of pipeline leakage points, and is suitable for compact hydraulic system designs in small equipment.

Installation and Maintenance Points: Before installation, clean the base and valve assembly mounting surfaces, check for damage to the sealing groove, apply Cat Hydraulic Seal Grease when installing the gasket, insert the locating pin, and tighten the bolts diagonally (tighten in 3 stages to the rated torque). After installation, check for leaks at the oil port seals, and ensure the gap between the base plane and the valve assembly is ≤0.03 mm.

Every 2000 hours of maintenance, check the flatness of the base. If the flatness exceeds 0.10 mm, it needs to be ground and repaired. When replacing gaskets, use genuine parts to avoid leaks caused by poor compatibility of aftermarket gaskets. If bolts are loose, retighten them to the specified torque.

Recommended hydraulic oil: Cat DEO-ULS 15W-40. Replace the hydraulic oil filter regularly (recommended every 2000 hours) to prevent oil contamination that could cause wear on the base oil ports and affect sealing performance.