CAT 183-8450 BALL

CAT 183-8450 is a rotary ball valve assembly (commonly known as a pump rotary ball) for Caterpillar hydraulic pumps. It is used to control the direction of fluid within the pump, reduce turbulence and pressure fluctuations, and is suitable for medium- and high-pressure hydraulic systems. The following is structured technical and application information.

Core Technical Parameters

Item Details
Basic Attributes Model 183-8450, Type: Pump Rotary Ball Pump, Material: 440C Stainless Steel (Integral Hardening), Single Weight: Approx. 0.52 kg, Applicable Pressure: 35-42 MPa, Applicable Temperature: -20℃ to +120℃, Applicable Medium: Cat TO-4 Hydraulic Oil, Rotation Angle: ±15°, Sealing Type: Carbide Sealing Surface

Key Dimensions Outer Diameter: 66 mm, Inner Diameter: 28 mm, Ball Crown Curvature Radius: R33 mm, Sealing Surface Width: 3 mm, End Journal Diameter: 25 mm (Tolerance f7), Length: 58 mm, Coaxiality: ≤0.008 mm, Surface Roughness: Ra≤0.4 μm, Hardness: HRC 60-64, Roundness: ≤0.005 mm

Compatible Models and Locations Compatible with Cat 336GC/349GC Excavator Main Pump (Model 353-9845), 980M Loader hydraulic pump (model 299-7075), 16M grader steering pump, one unit per machine, used for pump flow regulation and direction control, suitable for flow rates ≤380 L/min.

Performance Parameters: Rated working pressure 42 MPa, maximum impact pressure 50 MPa, leakage ≤0.5 mL/min (at 42 MPa), friction coefficient ≤0.0015 (hydraulic oil lubrication), fatigue life ≥10 million cycles, recommended cleanliness ISO 18/15, installation torque 45-50 N・m

Structural and Performance Advantages:

Integral Stainless Steel Structure: 440C stainless steel, integrally quenched, combining high hardness and corrosion resistance, suitable for the impact and wear conditions of high-pressure hydraulic systems, extending the life of the sealing surface.

Spherical Seal Design: Spherical crown curvature radius R33 mm, hard alloy sealing surface, rotation angle ±15°, ensuring precise flow regulation, low leakage, and reducing system pressure loss.

High-precision dimensional control: Coaxiality ≤0.008 mm, roundness ≤0.005 mm, surface roughness Ra≤0.4 μm, ensuring smooth rotation, reducing friction loss, and improving pump efficiency.

Standardized compatibility: Compatible with multiple Cat engineering machinery high-pressure hydraulic pumps, installation requires no structural adjustments, offering strong versatility, convenient replacement, and reduced maintenance costs.

Installation and maintenance points: Before installation, clean the valve body and ball seat, check the sealing surface for scratches and chipping. Use a special tool (Cat 9U-7250) for installation, avoiding impact. After installation, test rotational flexibility to ensure no jamming.

Maintenance cycle: Check hydraulic oil cleanliness every 1000 hours, and check the wear of the rotating ball seal surface every 2000 hours. If the wear depth of the sealing surface exceeds 0.1 mm, or if cracks or corrosion appear, replace immediately.

Common faults and solutions: Increased leakage is mostly due to wear on the sealing surface or scratches from foreign objects, requiring grinding of the sealing surface or replacement of the rotating ball; Rotation jamming is mostly due to hydraulic oil contamination, requiring replacement of the filter element and cleaning of the system.