Product Details

139-3990 5I-8368 Main Pump Solenoid Valve with Base for CAT E320B E312 Excavator Supplier

Reliable hydraulic control is the heart of your excavator performance. When your machine experiences pressure instability or slow response, the 139-3990 (also known as 1393990) and 5I-8368 (5I8368) solenoid valves are the critical components you need. We provide premium OEM standard replacements specifically designed for CAT E320B and E312 models to ensure your equipment returns to peak operational efficiency.

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Technical Specifications for 139-3990 / 5I-8368

Field	Details
Model NO.	CAT E320B, E312, E320L, E320BL
Part Number	139-3990 / 1393990 / 5I-8368 / 5I8368
Product Name	Main Pump Solenoid Valve (with Base)
Type	Hydraulic Control Solenoid
Condition	Brand New, OEM Standard Replacement
MOQ	1 Piece
Payment Terms	T/T, Western Union, MoneyGram
Delivery Methods	DHL, Fedex, EMS, UPS, Air/Sea Freight
Stock Status	In Stock / Fast Dispatch within 24 Hours
Application	Excavator Main Pump Pressure Control, Engine Overhaul

6 Core Procurement Advantages: OEM Replacement vs. Generic

Feature	Our OEM Standard Valve	Low-Cost Generic Alternatives
Coil Conductivity	High-purity copper coils for stable signal	Aluminum or low-grade copper (overheating risk)
Response Time	Instantaneous hydraulic switching	Delayed response leading to pump damage
Seal Durability	Fluorine rubber seals (High temperature resistance)	Standard rubber (Prone to leaking)
Fitment	100% Precise fit for 139-3990 / 5I-8368	Modification often required
Service Life	Heavy-duty industrial grade	Short lifespan under high pressure
After-sales	Technical support and replacement guarantee	No warranty or support

Not sure how this issue affects your equipment?

A faulty 139-3990 solenoid valve can lead to catastrophic pump failure if ignored. Our technical team helps operators:

Identify potential risks during routine maintenance checks.
Recommend suitable replacement parts based on your specific serial number.
Support both inspection advice and high-quality parts supply.

Don't wait for a breakdown. Send Your Part Number to our specialists for a free compatibility audit.

Troubleshooting & FAQ for CAT Excavator Hydraulic Systems

1. Why is my E320B excavator experiencing hydraulic power loss?

The most common cause is a failing 5I-8368 or 139-3990 solenoid valve. This valve controls the main pump output. If the coil is burnt or the internal needle is stuck, the pump will not receive the correct signal to stroke, resulting in weak movements. Replacing with a new solenoid usually restores power immediately.

2. How to test if the 1393990 solenoid valve is working?

Use a multimeter to check the resistance of the solenoid coil. A reading outside the standard range (typically 20-50 ohms depending on ambient temp) indicates a short or open circuit. You can also listen for a "click" sound when the ignition is turned on to verify electrical actuation.

3. Why Choose This Main Pump Solenoid Valve?

OEM-standard tri-metal structure: Designed for extreme hydraulic pressures and vibration.
Trusted by repair shops & equipment fleets: Proven reliability across thousands of hours of operation in construction sites.

Professional Excavator Engine & Hydraulic Parts Supplier

As a leading industry specialist, we provide comprehensive solutions for Caterpillar, Komatsu, Cummins, Isuzu, Yanmar, Kubota, and Weichai engines. Our core focus is on high-performance components that keep your machinery moving.

Our Main Product Range Includes:

Engine Assembly, Cylinder Liners, Pistons, Piston Rings, Main Bearings, Con-rod Bearings, Thrust Washers, Full Overhaul Gasket Kits, Diesel Fuel Injection Pumps, Injectors, Cranksahfts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.

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