Description
Is your DH20 or DH30 crawler excavator leaving oil on the ground where the upper frame meets the undercarriage? Is the travel motor sluggish or the blade weak? The problem often starts at the center joint. This DH20 DH30 center joint lower assembly is a direct-fit hydraulic swivel that replaces the worn factory unit, re-sealing the passageways between the pump and the lower machine circuits so oil pressure goes where it belongs.
Built from alloy steel with chrome-plated internal spindles, this lower assembly resists rust and keeps oil flowing cleanly. Polyurethane and NBR seals come pre-installed and lubricated straight from our factory — no extra seal kit, no bench assembly. Every unit is multi-circuit pressure-tested before we crate it, so you know it will hold the line from the first hour of operation. Covered by a 6-month warranty, it is the dependable fix your jobsite is waiting for.
Key Features
-
Alloy steel body with hard chrome-plated oil passages – resists corrosion and reduces internal friction
-
Pre-installed PU and NBR seals, factory-lubricated – mount it, connect the hoses, and go to work
-
CNC-machined flange and ports match original DH20/DH30 mount dimensions exactly
-
Every assembly is pressure-tested on all circuits before leaving the factory
-
Packed in VCI anti-rust film and an ISPM-15 fumigated wooden crate for damage-free transit
Applications
This center joint is built for DH20 and DH30 crawler excavator hydraulic systems. It is most commonly replaced when:
-
A puddle of hydraulic oil forms at the junction between upper and lower frames
-
Travel motor feels weak or the machine drifts on a slope
-
Blade function is sluggish or inconsistent
-
Internal cross-port leakage causes one function to rob hydraulic power from another
-
After high-hour service intervals as preventive maintenance
Suitable for machinery repair shops, construction, mining, energy, equipment rental fleets, and retail parts buyers.
FAQ
Q: How can I be sure it fits my DH20 or DH30?
A: Send us your machine serial number or the part number from the old center joint. Our technicians cross-check it before we ship.
Q: Are the seals already fitted?
A: Yes. All internal seals come pre-installed and lubricated. The assembly is ready to bolt on and connect the hydraulic lines straight out of the box.
Q: What if the part fails within the warranty period?
A: Contact us with installation photos, a video of the machine in operation, and a description of the fault. Three senior technicians review your case. If the cause is a manufacturing defect, we replace or refund the part.
Q: Do you really sell just one piece?
A: Yes. MOQ is 1 piece. Whether you need one urgent replacement or a bulk order for your fleet, you get the same level of service.
Q: Can you help with installation instructions?
A: Absolutely. We can provide the OEM service manual pages, bolt torque specifications, and a step-by-step installation guide.
Q: How do you protect the part during shipping?
A: The assembly is sealed in VCI anti-rust film, padded with high-density foam, and secured in an ISPM-15 export-grade wooden crate.
Q: What payment methods can I use?
A: T/T, XT, PayPal, and Western Union are standard. For larger repeat orders, we also accept L/C.
Why Buy From Us
We have been shipping excavator parts from Zhucun, Guangzhou — the largest construction machinery parts hub in Asia — since 2001. You buy directly from our own factory and warehouse, not through a trading middleman. Our service team includes three senior technicians with more than 45 years of combined hands-on experience. When you call with a question, you speak to someone who has installed, diagnosed, and repaired these machines, not someone reading a script. The result is a supplier that understands downtime hurts and moves at the speed you need.
Inventory & Dispatch
DH20 and DH30 center joints sit on our warehouse shelves, not on a factory production schedule. Once your order is confirmed and payment is received, we pack your assembly and dispatch it within 24 hours on most business days. Each unit is pressure-tested, sealed, padded, and crated in a fumigated ISPM-15 wooden box before it leaves our dock. For breakdown emergencies, we ship via DHL, FedEx, or UPS for delivery within 3–7 business days worldwide. Sea freight and air freight are available for larger quantities.
