Description
The CAT307 center joint lower assembly is a direct replacement swivel joint for the Caterpillar 307 excavator. It connects the upper hydraulic system to the lower frame, routing oil to the travel motor and dozer blade circuits while allowing full 360-degree rotation without hose twisting.
Manufactured from high-grade alloy steel and machined to OEM specifications, this unit delivers exact port alignment, matching bolt patterns, and correct seal configuration for a bolt-on installation. Each assembly is pressure-tested at the factory before shipment and backed by a 6-month warranty.
Key Features
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Alloy steel body with chrome-plated internal spindles for corrosion resistance and smooth oil flow
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Pre-installed polyurethane and NBR seals, lubricated and ready to mount — no extra seal kit needed
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CNC-machined mounting flange and port positions matching OEM drawings directly
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Multi-circuit pressure-tested before crating (rated working pressure up to 37 MPa)
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Packed in VCI anti-rust film and ISPM-15 fumigated wooden crate for long-distance shipping
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Name | CAT307 Center Joint Lower Assembly |
| Excavator Model | Caterpillar 307 |
| Category | Center Joint / Swivel Joint / Rotary Manifold |
| Body Material | Alloy Steel |
| Spindle Surface | Hard Chrome-Plated |
| Seal Material | PU (Polyurethane) & NBR |
| Working Pressure | Up to 37 MPa (5,366 PSI) |
| Warranty | 6 Months |
| MOQ | 1 Piece |
| Price | Negotiable |
| Supply Ability | 1,000 Pieces per Month |
| Packaging | Standard Fumigated Wooden Crate |
| Delivery Time | 1–5 Business Days |
| Payment Terms | T/T, XT, PayPal, Western Union |
| Shipping Options | Sea Freight, Air Freight, Express (DHL/FedEx/UPS) |
| Place of Origin | China |
Applications
Designed for the hydraulic system of Caterpillar 307 crawler excavators. Commonly replaced during:
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Hydraulic system overhauls
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Center joint seal failure and external oil leakage
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Internal cross-port leakage causing slow travel, swing drift, or weak blade function
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Preventive maintenance at high-hour intervals
Suitable for machinery repair shops, construction, mining, energy, equipment rental fleets, and retail.
Packaging & Shipping
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Wrapped in VCI anti-rust film to protect machined surfaces
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Padded with high-density foam for shock absorption
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Secured in ISPM-15 fumigated wooden crate as standard
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Custom packaging available on request
Shipping methods: Express (3–7 business days), Air Freight, or Sea Freight. Orders confirmed before 12:00 PM CST typically dispatch the same day when in stock.
FAQ
Q: How do I confirm this fits my CAT307?
A: Provide your machine serial number or current center joint OEM part number. Our technicians cross-reference it before shipping.
Q: Are the seals pre-installed?
A: Yes. All seals come fitted and lubricated. Mount the assembly and connect hydraulic lines directly.
Q: What if the part fails during the warranty period?
A: Send us installation photos, an operation video, and a fault description. Three senior technicians will review your case. If it’s a quality defect, we replace or refund the part.
Q: Can I order just one piece?
A: Yes. MOQ is 1 piece. Emergency single orders and bulk fleet purchases receive the same service commitment.
Q: Do you provide installation support?
A: Yes. We can supply the relevant service manual pages, torque specifications, and installation tips.
Q: How is the part protected during shipping?
A: Vacuum-sealed in anti-rust film, packed in high-density foam, and crated in ISPM-15 export-grade wooden box.
Q: What payment methods do you accept?
A: T/T, XT, PayPal, and Western Union. L/C options are available for larger orders.
Get a Quote
Send us your CAT307 serial number or current part number. We confirm stock and return a firm quote within hours. Same-day dispatch available for all in-stock items.
