Excavators Hydraulic Boom Cylinder for Komatsu
Reinforced boom cylinder built for Komatsu excavators operating in heavy-duty digging, lifting, and rock handling environments. Manufactured with chrome-plated rod, honed steel barrel, and high-pressure seal kits for reliable hydraulic lift and structural stability.
| 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 boom cylinder controls the elevation of the entire working arm assembly—including the arm (stick), bucket, and attached load. It bears the greatest static and dynamic forces during lifting, dumping, and travel damping.
On machines like PC200, PC300, and PC450, boom cylinders operate under vertical lifting loads, swing momentum, and side forces when working on inclines or rocky terrain. These cylinders must offer precise responsiveness, internal pressure stability, and crack-resistant structure to maintain safe and productive operations.
Materials & Mechanical Durability
Each Komatsu boom cylinder is made from Q345B, Q690, or 42CrMo alloy steel, depending on working conditions and model load class. Key features include:
Induction-hardened piston rod with mirror-polished chrome finish
Thick-walled barrel to resist high-pressure deformation
Precision-welded ends for secure pin mounting
CNC-machined ports and threaded joints for flawless assembly
The internal surface is honed to < Ra 0.2μm to minimize friction and reduce seal wear, ensuring longer life under extreme pressures.
Internal Structure Diagram
This cross-sectional image illustrates the core components inside a boom cylinder, including the piston, wear rings, seal stack, and end cap. It helps users understand pressure retention, stroke dynamics, and wear zones.
Cylinder Manufacturing Process
Every boom cylinder undergoes a rigorous production and testing sequence. The following stages are documented with factory visuals:
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 at up to 150% of rated pressure to verify sealing integrity. Final units are cleaned, oil-coated, and securely packed in wooden crates for international shipping.
OEM Undercarriage Parts for Komatsu Excavator
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOMATSU-PC | PC20 | PC30-5 | PC30-6 | PC30-7 | PC30-8 | PC35 | PC40 | PC45 |
| PC50 | PC55 | PC40-5 | PC40-6 | PC40-7 | PC50 | PC55 | PC60-1 | |
| PC60-3 | PC60-5 | PC60-6 | PC60-7 | PC75 | PC100-1 | PC100-3 | PC100-5 | |
| PC100-6 | PC100-7 | PC120-3 | PC120-5 | PC120-6 | PC120-7 | PC150 | PC200-1 | |
| PC200-3 | PC200-5 | PC200-6 | PC200-7 | PC200-8 | PC220-1 | PC220-3 | PC220-5 | |
| PC220-6 | PC220-7 | PC220-8 | PC200LC-3 | PC200LC-5 | PC200LC-6 | PC200LC-7 | PC200LC-8 | |
| PC240 | PC300-1 | PC300-5 | PC300-6 | PC300-7 | PC300LC | PC300LC-5 | PC300LC-6 | |
| PC300LC-7 | PC360-5 | PC360-6 | PC360-7 | PC360LC-5 | PC360LC-6 | PC360LC-7 | PC360LC-8 | |
| PC400-1 | PC400-3 | PC400-5 | PC400-6 | PC400-7 | PC400LC-1 | PC400LC-3 | PC400LC-5 | |
| PC400LC-6 | PC400LC-7 | PC450-5 | PC450-6 | PC450-7 | PC450LC-5 | PC450LC-6 | PC450LC-7 | |
| PC650 | PC750 | PC800 | PC350 | |||||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Komatsu Model Compatibility
This boom cylinder is compatible with the following Komatsu excavator models:
- PC200 / PC210 / PC220 / PC240 / PC270
- PC300 / PC350 / PC360 / PC400 / PC450 / PC490
Unsure about fitment? Send us your machine model, cylinder specs, or technical drawing—we’ll match your cylinder within 12 hours.
Maintenance Tips for Komatsu Boom Cylinders
- Keep pin ends greased and check for rod straightness
- Inspect weld seams and cylinder body after heavy lifting cycles
- Replace seal kits and rod bushings at service intervals
- Avoid sudden boom drops or hard retractions during operation
Frequently Asked Questions (FAQ)
Q: Can I install this cylinder using existing pins and brackets?
A: Yes, if your pins are not worn. However, we recommend replacing aged pins to ensure full alignment and avoid damage to new seals.
Q: Can you manufacture a custom boom cylinder for a modified excavator?
A: Yes. We can produce non-standard cylinders based on your provided drawings or dimensional specifications.
Q: Do you supply complete pin and bushing sets with the cylinder?
A: Yes. Upon request, we can include matching pins, bushings, and grease seals for a full replacement kit.
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.
