485-5747 Caterpillar (CAT) Hydraulic Pump Proportional Solenoid Valve — Primarily used for hydraulic system control in the new generation of GC Series excavators.

I. Key Specifications

Part Number: 485-5747 (4855747)

Type: Hydraulic Proportional Solenoid Valve (Pilot / Pump Control)

Rated Voltage: 24V DC

Interface: Integrated 2-Pin Connector

Thread Specification: 7/8-14 UNF

Applicable Medium: Hydraulic Oil

Warranty: 1 Year (Genuine OEM); 6–12 Months (Domestic Replacement)

II. Applicable Models (Primarily GC Series)

Excavators: 320GC, 323GC, 326GC, 330GC, 336GC, 313, 323D, 323D2

Core Function: Controls hydraulic pump displacement and pressure; regulates overall machine operating speed and the coordination of compound movements.

III. Common Faults and Symptoms

Coil Burnout: No response to commands; pump fails to build pressure.

Spool Sticking/Seizing: Slow operation; lack of power/force; engine stalling/bogging down; speed drop.

Oil Leakage: Oil seepage at the valve stem or end face; loss of hydraulic fluid.

V. Selection and Installation Guidelines

Verify the machine model (GC Series) and voltage (24V) requirements.

Installation Torque: 35–40 N·m

Recommended Fluid Filtration Precision: ≥ 25μm (to prevent spool sticking caused by impurities).

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