4286404 4328226 Swing Motor Relief Valve for Hitachi EX120-2 Excavator
$115.00
This aftermarket new swing motor relief valve is listed for Hitachi EX120-2, EX120-5 and EX120-3 excavators, part number 4286404. It caps the maximum pressure in the hydraulic circuit so the system works safely. It also cross-references 4328226 and 4373201B.
4286404 Swing Motor Relief Valve is an aftermarket replacement swing motor relief valve for Hitachi excavators, including EX120-2, EX120-5, EX120-3 and other listed models. A relief valve limits the maximum pressure in a hydraulic circuit. It is supplied by LIONKITS as aftermarket new with a 3-month warranty.
4286404 Swing Motor Relief Valve Specifications
- Product Type: Swing Motor Relief Valve
- Part Number: 4286404, 4328226, 4373201B
- Compatible Brand: Hitachi
- Machine Type: Excavator
- Condition: Aftermarket new
- Product Weight: 1.5kg/3.3 pounds (1 piece)
- Warranty: 3 months
- Brand: LIONKITS
- Country of Origin: China
Hitachi Models Compatible with the 4286404 Swing Motor Relief Valve
- Hitachi Excavator EX120-2 EX120-5 EX120-3
Your model is not listed? Contact LIONKITS via live chat or email with your machine model and nameplate photo, and we will confirm compatibility.
What Does a Hydraulic Relief Valve Do?
A relief valve limits the maximum pressure in a hydraulic circuit. When pressure reaches the set value, the valve opens and releases excess oil to the tank, which protects the pump, hoses, motors and cylinders from overload. The main relief valve sets the pressure for the whole system, while circuit reliefs such as swing, travel or auxiliary reliefs protect individual functions.
Signs the Valve Needs Replacing
- Weak power and slow movement: the machine struggles with loads it used to handle, because the relief valve opens too early or leaks.
- Low or unstable system pressure: a gauge at the test port shows low or fluctuating pressure; if the main relief is weak, every function is weak.
- Noise or vibration: unusual noise or shaking in the hydraulic system can point to a worn or damaged relief valve.
- Overheating oil: oil that keeps bypassing across a leaking relief heats up quickly.
These symptoms overlap with worn pumps, dirty oil and clogged filters, so check the basics and measure pressure before replacing the valve.
How to Order and Install the 4286404 Swing Motor Relief Valve
- Confirm your machine model, engine model and the part number on your existing valve before ordering.
- Send a photo of the nameplate or the old valve if you are not sure; LIONKITS will confirm fitment for you.
- Check the set pressure with a pressure gauge at the test port after installation, and adjust it to the specification in the service manual.
- Clean the valve bore and replace the hydraulic oil filters; contaminated oil is a common cause of sticking relief valves.
- Replace the O-rings and keep the valve free of dirt while it is out of the machine.
Shipping, Payment and Support
- Dispatch and delivery: Your package will be sent within 2-3 business days, and another 3-7 business days to arrive in your country
- Payment methods: Credit Card, PayPal, T/T, Western Union
- Order tracking: A tracking number with a tracking link is sent by email once the order ships.
- Returns and refunds: If you encounter any issues with the product, please contact us promptly and provide detailed feedback. We will handle the return or exchange promptly
Frequently Asked Questions
What is the 4286404 Swing Motor Relief Valve?
The 4286404 Swing Motor Relief Valve is an aftermarket replacement swing motor relief valve for Hitachi excavators, supplied as aftermarket new under part numbers 4286404, 4328226, 4373201B.
Which Hitachi models does the 4286404 Swing Motor Relief Valve fit?
It is listed for EX120-2, EX120-5, EX120-3. If you are unsure, send your machine nameplate to LIONKITS for confirmation.
How do I know a relief valve has failed?
Typical signs are weak hydraulic power, slow movements, low or unstable pressure at the test port, unusual noise or vibration and oil running hot.
What are the warranty and delivery terms for the 4286404 Swing Motor Relief Valve?
Warranty: 3 months. Your package will be sent within 2-3 business days, and another 3-7 business days to arrive in your country.
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