Description
CAT 6P-4939 PISTON LOAD
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The CAT 6P-4939 is a Caterpillar genuine carbon steel load piston used in transmission gear selector and pressure control valve assemblies. It uses hydraulic oil to regulate pressure and shift gears, and is compatible with the transmission systems of heavy equipment such as loaders and bulldozers, ensuring smooth shifting and stable pressure. The following are key information.
Core Technical Parameters
Item Details
Part Model: CAT 6P-4939 (Load Piston, Single Unit)
Material: High-quality carbon steel, surface anodized, wear-resistant and corrosion-resistant, suitable for hydraulic oil operation
Key Dimensions: Length approx. 59mm, piston diameter approx. 25mm, piston rod diameter approx. 12mm, sealing groove width approx. 3mm, compatible with standard O-rings
Single Weight: Approx. 0.12kg (0.26 lbs)
Compatible Machines: Loaders 950B/E/F, Bulldozers 613C/615C, Articulated Dump Trucks D250E/D300E, Road Rollers 815B/F/816F, etc.
Compatible Valve Groups: 3T5816, 1175982 gear selector and pressure control valve body, compatible with 3046/3116/3126 and other engine power transmission systems
Performance Characteristics: Suitable for working pressure 0-35MPa, temperature -20℃ to +100℃, high reciprocating motion precision, good sealing compatibility, and sensitive response.
Structure and Core Functions
Pressure Regulation: In the pressure control valve assembly, displacement occurs with changes in hydraulic oil pressure. System pressure is regulated through throttling and feedback to prevent overload and protect the gearbox clutch and hydraulic components.
Gear Shifting Assist: In the gear selection valve assembly, hydraulic drive force is transmitted to assist clutch engagement/disengagement, achieving smooth gear shifting, reducing impact, and improving transmission efficiency.
Position Feedback: The status of the hydraulic system is fed back through piston position changes. Combined with valve core adjustment, this ensures precise matching of pressure and gear, guaranteeing stable equipment operation.
Sealing and Isolation: In conjunction with O-rings, different hydraulic chambers are isolated to prevent oil leakage, maintain stable system pressure, and avoid power loss.
Suitable Scenarios and Installation Points
Suitable Scenarios: Used for gear selection and pressure control valve bodies in heavy equipment gearboxes, suitable for frequent gear shifting and heavy-load operation conditions, such as loaders, bulldozers, and road rollers in mines and construction sites. Installation Specifications: Clean the valve body mounting holes and piston surface, ensuring they are free of burrs, oil, and impurities; inspect the O-rings and sealing grooves, replace any worn seals, and apply hydraulic oil for lubrication.
Use specialized tools to smoothly install the valve body, avoiding scratches or deformation; tighten the valve cover to the original torque to ensure smooth piston movement, with the clearance controlled between 0.01-0.02mm.
