Hitachi ZAX330 ZAX360 EX330 EX360 Excavator Center Joint Swivel Joint Hydraulic Oil Distributor

Hitachi ZAX330 ZAX360 EX330 EX360 Center Joint Swivel Joint

The ZAX/EX 330/360 Center Joint (also called rotary swivel joint, oil cup or hydraulic oil distributor) is a precision-machined hydraulic rotary joint for Hitachi 330 and 360 class excavators. It transfers hydraulic oil from the upper structure to the travel motors, dozer blade and attachment circuits while the machine slews through a full 360°, keeping hoses free of twisting, chafing and premature failure.

Compatible Models

• Hitachi ZAX330, ZAX330-3, ZAX330-5G / ZAX330 series crawler excavator
• Hitachi ZAX360, ZAX360-3, ZAX360-5G / ZAX360 series crawler excavator
• Hitachi EX330, EX330-3, EX330-5 excavator
• Hitachi EX360, EX360-3, EX360-5 excavator
• ZAXIS 330 / ZAXIS 360 export and local market machines

Please send your machine serial number or the original part number stamped on the old joint. Our engineers confirm the correct port configuration and shaft spline within 24 hours.

Key Features

• Full 360° Rotation — Multi-channel rotary distributor keeps hydraulic oil flowing to the undercarriage at every slewing angle, removing hose twist and rubbing on the center frame.
• Precision-Machined Core — Hardened alloy steel rotor and high-strength cast steel housing are ground to tight tolerance, holding internal leakage at minimum under rated working pressure.
• High-Pressure Seal System — Nitrile and Viton O-rings with back-up rings rated for continuous high-pressure duty, resistant to heat ageing and hydraulic oil attack.
• Direct Bolt-On Fit — Mounting flange, port layout and shaft spline matched to original ZAX/EX 330/360 dimensions, so the joint drops into place with standard tools.
• Corrosion-Resistant Finish — Nickel-plated exterior protects the body against rust, mud and wash-down water on site.
• 100% Pressure Tested — Every unit is bench tested for internal and external leakage before packing.

Technical Specifications

Typical Failure Signs This Joint Fixes

• Travel motors slow, weak or drifting on one track
• Hydraulic oil leaking from the center of the slew ring
• Hoses twisting or rubbing when the house is turned
• Oil overheating and pressure drop after long working hours
• Blade or auxiliary circuit losing power during slewing

Company Profile

ABOUT US — Guangzhou Xingfan Precision Oil Pressure Co., Ltd. focuses on after-market hydraulic maintenance and replacement for construction machinery, including excavator, rotary drilling rig, pile driver, concrete mixer, delivery pump truck, crane and harvester. Our range covers hydraulic pump, travel motor, swing motor, distribution valve, multi-way valve, gear pump, operating handle, travel foot valve and center joint.

Factory Display

Machining, assembly, pressure testing and packing are completed in our own workshop in Guangdong, China. OEM and buyer-label packing are available on request.

FAQ

Q1: What is the ZAX/EX 330/360 Center Joint?
A: It is a hydraulic rotary swivel joint manufactured by YFM FK in Guangdong, China, for Hitachi ZAX330, ZAX360, EX330 and EX360 excavators. It transfers hydraulic oil from the upper structure to the undercarriage during 360° slewing and meets OEM fitment dimensions.

Q2: Which models does it fit?
A: It fits Hitachi ZAX330 / ZAX360 / EX330 / EX360 and their -3 and -5 variants. If you are unsure about compatibility, send us your machine model and serial number and we confirm within 24 hours.

Q3: What warranty and after-sales support do you provide?
A: Warranty terms are negotiated case by case according to model, quantity and destination market — please discuss the coverage you need with our sales team before ordering. Every unit is pressure tested before shipment, and we assist with installation questions, part identification and replacement advice after delivery.

Q4: What is the price and MOQ?
A: Price is negotiable and depends on port configuration, order quantity and shipping terms. Minimum order quantity is 1 piece. Send us your required quantity and destination port and we will quote the best price the same working day.

Q5: How do I pay and when will it ship?
A: We accept T/T, L/C at sight, Western Union, PayPal and . Stock items ship in 3 working days; production orders in 15–25 days after confirmation. All parts are packed in export-grade wooden cases with shock-proof protection.

Q6: Which regions do you export this joint to and how is it shipped?
A: We regularly ship to Southeast Asia (Indonesia, Philippines, Malaysia, Vietnam, Thailand), the Middle East (UAE, Saudi Arabia, Turkey), Africa (Nigeria, Kenya, South Africa, Egypt) and South America (Brazil, Chile, Peru). Goods leave from Guangzhou or Shenzhen port with FOB, CIF or DDP terms, by sea LCL/FCL for bulk orders or by air express for urgent single pieces, and we can declare the value and packing list to match your customs requirements.