474-9387 Caterpillar (CAT) Hydraulic Proportional Solenoid Valve (Cartridge Type) — Primarily used for hydraulic system control in heavy-duty construction machinery.

I. Core Specifications

Part Number: 474-9387 (also written as 4749387)

Type: Hydraulic Proportional Solenoid Valve / Pilot Solenoid Valve

Rated Voltage: 12V DC

Maximum Operating Pressure: 240 bar

Operating Temperature: -40°C ~ +120°C

Fluid Requirements: Oil filtration precision of 25μm or finer

Installation Torque: 34 ~ 37 N·m

Weight: Approx. 0.7 kg

II. Applicable Models

Primarily paired with Caterpillar C9, C13, and C18 series engines; used in:

Wheel Loaders: 972H, 980, 980H, 990, 992, 993, 994

Excavators / Rotary Drills: 345D, 349D, 374D, 390D, etc.

Motor Graders / Dozers: 140H, D8R

Underground Loaders: R2900G, R2900, R3000H

III. Function and Purpose

Features: Proportional control type; receives electrical signals to regulate hydraulic oil pressure and flow rate.

Control: Regulates the speed and force of hydraulic pumps, main control valves, and actuators (boom, stick, bucket).

Common Faults: Sticking/seizing, oil leakage, coil burnout; symptoms include slow operation, lack of power, abnormal movement, or inability to shut down the engine.

V. Alternatives and Interchangeability

Direct Replacement: 4749387 (without the hyphen)

Functionally Similar: 174-4913, 195-9700 (Note: Machine model and voltage compatibility must be verified)