Precision-Engineered Parts for Excavator Hydraulic Systems Maintenance and Overhaul
When your CAT E320B or E312 excavator experiences sluggish hydraulic response or pressure drops, the solenoid valve is often the primary culprit. We provide high-performance 139-3990 (1393990) and 5I-8368 (5I8368) hydraulic solenoid valves (with base) designed to restore your machine's peak efficiency. As a leading replacement parts supplier, our components meet rigorous OEM standards, ensuring seamless integration into your equipment's hydraulic circuit.
These units are critical for controlling fluid flow and pressure within the hydraulic system, directly affecting the operation of the boom, arm, and bucket. Our parts are trusted by maintenance teams globally for their durability and precise actuation.
| Detail Field | Specifications Data |
|---|---|
| Model NO. | CAT E320B / E312 / E312B / E312C / E320 Series |
| Product Name | Hydraulic Solenoid Valve (with Base) |
| Part Number | 139-3990, 5I-8368 (Also referenced as 1393990, 5I8368) |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express (DHL, Fedex, EMS, UPS), Air Freight, Sea Cargo |
| Condition | Brand New, OEM Standard Replacement |
| MOQ | 1 Piece |
| Stock Status | In Stock / Fast Dispatch within 24-48 Hours |
| Packaging | Industrial Export Packing / Anti-Corrosion Wrap |
| Application | Engine rebuild, hydraulic overhaul, routine maintenance |
| Feature | Our OEM Replacement Standard | Generic Market Parts |
|---|---|---|
| Build Quality | High-strength alloy steel with anti-wear coating | Standard recycled cast iron |
| Coil Response | Instant electromagnetic actuation (MS level) | Delayed response leading to jerkiness |
| Seal Integrity | High-temperature resistant fluororubber seals | Standard nitrile rubber (prone to leaks) |
| Base Fitment | Precision-machined base for zero-leakage mounting | Generic base often requires modification |
| Life Cycle | Tested for over 1,000,000 cycles | Uncertain lifespan, high failure rate |
| Support | Full technical guidance and compatibility check | Sales only, no after-sales technical help |
Common symptoms include the hydraulic system failing to hold pressure, the excavator arm moving on its own (drifting), or specific hydraulic functions not engaging. Using a multimeter to check the coil resistance of the 1393990 solenoid is the first step in diagnosing electrical failure.
Yes, the 5I8368 and 139-3990 are standard configurations for the E320B and E312 series. However, we always recommend providing your machine serial number to our team for a 100% accuracy check before dispatch.
Answer: Our units feature an OEM-standard tri-metal structure for superior heat dissipation and mechanical strength. They are trusted by repair shops and equipment fleets because they reduce downtime and prevent costly hydraulic pump damage caused by valve failure.
Not sure how this issue affects your equipment?
Our team helps operators achieve the following:
Identify potential risks during maintenance to prevent sudden hydraulic collapse.
Recommend suitable replacement parts if needed based on wear patterns.
Support both inspection advice and parts supply for a one-stop repair experience.
Our company specializes in high-quality engine assemblies and spare parts for world-leading brands including Caterpillar, Cummins, Komatsu, Isuzu, Kubota, Yanmar, and Weichai. We are your reliable partner for heavy equipment restoration and engine longevity.
Core Inventory Highlights: Cylinder Liners, Pistons, Piston Rings, Crankshaft Main Bearings, Connecting Rod Bearings, Thrust Washers, Full Overhaul Gasket Kits, Diesel Fuel Injection Pumps, Fuel Injectors, Forged Crankshafts, Turbochargers, High-Flow Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
E320B Spare Parts Excavator Engine Rebuild Kit Caterpillar Aftermarket Components Komatsu PC200 Parts Cummins 6BT Engine Parts Isuzu 6HK1 Liner Kit Kubota V2203 Repair Parts Yanmar Marine Engine Spares Diesel Injector Replacement Hydraulic Pump Overhaul Crankshaft Grinding Parts Turbocharger Upgrade Water Pump Supplier Heavy Equipment Gasket Set Fuel Pump Calibration Construction Machinery Parts OEM Quality Pistons Cylinder Head Assembly Engine Bearing Set Connecting Rod Replacement
Click the button below to visit our Facebook profile and stay updated with the latest news and updates!
Visit Facebook Profile
English
English