Wholesale Hydraulic Bucket Cylinder for Kobelco Excavators Parts
High-performance bucket cylinder tailored for Kobelco excavators. Built from alloy steel with a honed barrel, chrome-plated piston rod, and multi-seal hydraulic system, it ensures powerful and precise bucket actuation under high load cycles in earthmoving, trenching, and demolition.
| Cylinder Tube | Q345 / ST52 / 27SiMn / 20# Steel |
|---|---|
| Piston Rod | 45# / 40Cr / 42CrMo (Hard Chrome Plated) |
| Piston | Ductile Iron / Forged Steel (45# / 20Cr) |
| Cylinder Head | Q345 / 45# Steel / Cast Steel |
| Seals | Polyurethane (PU), NBR, FKM |
| Guide Bush | Bronze Alloy / Composite Materials |
| Ports & Fittings | Zinc-Plated Carbon Steel / Stainless Steel |
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Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
The bucket cylinder is the final link in the hydraulic power chain of an excavator—it’s responsible for controlling bucket curling and dumping, the most frequently used motion in daily operation. On Kobelco machines like SK210LC, SK250-8, or SK330LC, it:
- Provides the force to break through tough soil or rock
- Controls precise bucket positioning for grading or backfilling
- Absorbs rebound forces when the bucket strikes compacted ground or materials
Because of this high-frequency, high-impact motion, the bucket cylinder must be robust, tightly sealed, and precisely aligned.
High-Strength Materials and Structural Engineering
Our Kobelco bucket cylinders are made using only certified structural alloys and built with precision tolerances to match OEM requirements:
- Cylinder Barrel: Honed Q345B / ST52 / 27SiMn seamless steel tubes with < Ra 0.2μm finish
- Piston Rod: Forged 42CrMo steel, induction hardened and chrome plated (25–30μm)
- End Caps & Pistons: CNC-machined, robot-welded for strength and seal accuracy
- Bushings: Wear-resistant options available with or without grease grooves
Features
- Excellent resistance to bending and pressure fatigue
- Long-lasting surface finish for rod seal protection
- Accurate mounting to reduce stress on boom-arm linkage
Internal Cross-Sectional Diagram
This diagram helps visualize how the rod, piston, barrel, and seals interact under pressure, showing key wear zones and sealing points for effective maintenance planning.
Cylinder Manufacturing Process
Showcasing these three key manufacturing stages can help build trust and transparency：
Rod Polishing & Surface Prep
The piston rod is ground and polished to achieve a mirror-smooth surface, ready for hard chrome plating. This step reduces wear on seals and ensures long-lasting hydraulic performance.
Assembly & Sealing
In a cleanroom assembly area, the barrel, piston, rod, and end caps are fitted and torqued to spec. Seal kits are carefully installed to prevent fluid loss and contamination.
Pressure Testing & Export Packaging
Each cylinder is tested to withstand 1.5× working pressure and checked for leaks, stroke alignment, and valve performance. Final products are sealed and packed in export-grade wooden crates.
Finished products are sprayed with anti-rust coating and packed in export-grade wooden crates.
OEM Undercarriage Parts for Kobelco Excavator
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOBELCO | SK30 | SK35 | SK40 | SK45 | SK55 | SK60 | SK60-8 | SK60-10 |
| SK75 | SK100 | SK120 | SK120-5 | SK120-6 | SK130 | SK135 | SK135SR | |
| SK135SR-2 | SK140 | SK140SR | SK200 | SK200-3 | SK200-5 | SK200-6 | SK200-8 | |
| SK200-10 | SK210 | SK210-8 | SK210LC | SK220 | SK230 | SK230LC | SK250 | |
| SK250-8 | SK260 | SK260LC | SK270 | SK300 | SK300-6 | SK300-8 | SK320 | |
| SK330 | SK330-6 | SK350 | SK350-8 | SK350LC | SK380 | SK400 | SK450 | |
| SK480 | SK480-8 | SK485 | SK500 | SK500LC | SK850 | SK850LC | ||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Model Compatibility for Kobelco
This bucket cylinder fits a wide range of Kobelco excavators, including:
- SK200 / SK210 / SK230 / SK250 / SK260 / SK300
- SK330 / SK350LC / SK350-10 / SK480 / SK300-8
- SK230SR / SK260NLC / SK350SRLC
Not sure if this fits your machine? Send us your casting number, machine model, or OEM reference, and our engineers will verify compatibility within 12 hours.
Maintenance Tips for Kobelco Bucket Cylinders
- Clean and inspect the rod surface every 300–500 hours to prevent buildup of abrasive debris that can damage seals or scratch the chrome layer.
- Watch for signs of slow bucket movement, oil seepage, or irregular sounds, which may indicate internal seal fatigue or low hydraulic pressure.
- Keep pivot bushings and cylinder pin points well-lubricated to reduce friction and extend bushing life. Replace immediately if excessive play or noise is detected.
- Avoid sudden impacts or full-stroke extension under maximum load, especially when working with dense soil or large rocks, to prevent internal piston stress or rod bending.
- During long idle periods, retract the rod fully and store the machine in a covered area to minimize corrosion and rod surface oxidation.
FAQ – Kobelco Bucket Cylinders
Q1: Can I use this cylinder on a different SK-series model?
A: Yes, many Kobelco bucket cylinders share design similarities. Just confirm the stroke length and pin dimensions—we’ll handle the rest.
Q2: Are these cylinders rebuildable?
A: Absolutely. All our cylinders are fully serviceable. We also offer spare seal kits if needed.
Q3: Can I request batch order customization with logo stamping?
A: Yes, logo engraving and casting marks are available for bulk orders or OEM use.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
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Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
