CAT 116-3445 27.5mm Outer Diameter Sleeve

CAT 116-3445 is a Caterpillar genuine control valve flow regulating sleeve, adapted to the internal flow regulating mechanism of hydraulic system control valves. The following is purely accurate information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 116-3445 (1163445) Flow Regulating Sleeve

Part Type: Control valve internal flow regulating sleeve, used to control valve spool position and valve opening, regulate hydraulic oil flow, pressure, and direction, and cooperate with valve stem and valve sleeve to achieve sealing and positioning (Cat®…)

Material: 17-4PH precipitation hardening stainless steel, solution treated + age hardening, hardness HRC40-45, precision ground surface, roughness Ra≤0.4μm, corrosion resistant, compatible with mineral and synthetic hydraulic oils

Key Dimensions: Inner diameter 22.00mm (0.8661in), outer diameter 27.50mm (1.0827in), total length 45.00mm (1.7717in), positioning step width 5.00mm, chamfer 0.5×45°, fit tolerance H7

Structural Features: With positioning step, smooth inner wall without oil groove, clearance fit with valve core 0.015-0.025mm, rated working pressure 35MPa, working temperature -20℃ to 100℃, static sealing leakage ≤0.1mL/min

Compatible Structures: Hydraulic pilot control valve, main control valve flow regulating chamber sleeve, compatible valve core outer diameter 22.00mm, valve body inner bore 27.50mm, installation interference 0.005-0.010mm

Applicable Working Conditions: Low-pressure flow regulating part in hydraulic system, flow regulating range 0-100L/min, working pressure ≤32MPa, compatible with mineral-based hydraulic oil (ISO VG32/46)

Compatible Models and Assemblies:
Excavator: CAT 320D, 323D, 330D (Main Control Valve Flow Regulation Assembly)
Loaders: CAT 938M, 950M, 966M (Pilot Control Valve Flow Regulation Assembly)
Road Rollers: CAT CS64B, CS74B (Hydraulic System Flow Control Valve Sleeve Assembly)
Adaptor Assemblies: 320D Main Control Valve Flow Regulation Sleeve Assembly, 950M Pilot Control Valve Flow Regulation Sleeve Assembly
Installation and Fitting Points:
Before installation, clean the valve body’s inner bore and the sleeve’s outer circumference, ensuring no burrs or scratches. Use cold-press installation with an interference fit of 0.005-0.010mm. Use a dedicated guide tool for positioning. Do not strike the sleeve’s end face to avoid deformation.

After installation, check that the sleeve’s coaxiality with the valve body’s inner bore is ≤0.01mm, and the clearance with the valve core is 0.015-0.025mm. Ensure the valve core moves smoothly without jamming or uneven wear.

After assembly, test the sealing performance at a pressure of 35MPa for 5 minutes. Leakage should be ≤0.1mL/min, and the flow rate adjustment linearity error should be ≤±2%.

Disassembly requires using a dedicated puller. Do not pry the sleeve edge. When replacing, check the wear of the valve body’s inner bore. If the wear is >0.01mm, the valve body must be repaired or replaced.