CAT 120B Hydraulic Boom Cylinder 099-0663 110mm Bore 1150mm Stroke Aftermarket

This reliable aftermarket hydraulic boom cylinder is professionally manufactured as a direct OEM replacement for 120B medium excavators. As the core hydraulic power component of the front working group, it controls boom lifting and lowering to complete excavation, material lifting, ground leveling and loading tasks. Widely used in municipal engineering, road renovation, residential construction and general earthmoving jobs.

All products are produced strictly following CAT original technical drawings and OEM standards, with identical mounting dimensions, pin hole spacing and hydraulic port layout. Direct bolt-on installation is available on site without cutting, welding or extra modification work.

1. 4 Part Numbers Interchangeable: All four listed part numbers refer to the same boom cylinder assembly. Every fitting size matches original CAT parts perfectly, connecting smoothly with boom linkages and hydraulic lines for stable long-hour operation.
2. Medium-Duty Reinforced Design: Thickened cylinder tube and lugs resist frequent dynamic loads and minor collisions on construction sites, effectively extending service life.
3. Strict Full Pre-Shipment Inspection: Each cylinder undergoes full-stroke reciprocating tests and high-pressure airtight leak detection to eliminate internal & external oil leakage risks completely.
4. High Cost-Efficiency: Offers the same stability and service lifespan as genuine CAT spare parts, cutting long-term procurement costs for repair shops and spare parts wholesalers.
5. Diversified Global Logistics: In-stock goods ship within 3 working days. Air freight for urgent orders, sea freight for low-cost bulk wholesale shipments.

Our factory has over 10 years of experience developing and producing hydraulic cylinders for classic CAT series excavators, including CAT 120B and other old & new models. We supply complete boom, arm and bucket cylinders with mature production craft and strict full-process QC. Our goods are exported to aftermarket markets in Africa, Southeast Asia and the Middle East, winning consistent trust and positive reviews from global dealers.

Q1: Can this boom cylinder fit CAT 120A or 140B excavators?

A: No. Each CAT model uses exclusive part numbers and unique structural sizes which cannot be cross-used. Please confirm your excavator full model before ordering.

Q2: Does the standard package include seal repair kit?

A: Seal kit is not included in standard package. You can buy the matching seal kit separately, and we will offer a favorable combined order price.

Q3: What packaging is used for long sea transportation?

A: Anti-rust oil inside cylinder cavity, anti-rust grease coated on piston rod. Wrapped with waterproof PE film and packed in reinforced export plywood cases to prevent moisture and collision damage.

Q4: Any discount for full set cylinders (boom+arm+bucket)?

A: Yes, tiered volume discounts for full working device cylinder sets. Consolidated container shipment service is available to save total logistics cost.

Q5: What after-sales support if oil leakage occurs under warranty?

A: Send clear photos of leakage area plus excavator serial number. We provide free seal replacement and professional remote technical guidance promptly.