Arm Hydraulic Cylinder Stick Cylinder Compatible with Komatsu Excavators
Heavy-duty arm hydraulic cylinder engineered for Komatsu crawler excavators. Built with high-strength alloy steel, mirror-honed barrel, and multi-stage seal kits for consistent power transfer between boom and stick under demanding digging conditions.
| 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 arm cylinder—also known as the stick cylinder—controls the extension and retraction of the excavator’s arm (stick). It plays a vital role in regulating digging depth, trenching angle, and material reach, directly impacting precision and efficiency during operations.
In machines like the Komatsu PC200, PC240, and PC360, the arm cylinder operates under repetitive, high-impact loads from deep excavation, slope cutting, and bucket breakout. Failure in this cylinder can lead to lagging response, uneven power delivery, or accelerated wear of bushings and pins.
That’s why each Komatsu arm cylinder we produce is engineered to ensure hydraulic stability, exact fitment, and long-term durability even under demanding conditions.
Materials & Mechanical Durability
Our arm cylinders are forged using Q345B or 42CrMo alloy steel, known for its excellent yield strength and fracture resistance. Key construction highlights:
- Induction-hardened chrome-plated piston rod
- CNC-machined rod ends and pin bores
- Honed cylinder barrel (< Ra 0.2μm) for smooth piston travel
- Reinforced welds to withstand high dynamic force
Each cylinder is pressure-rated to handle heavy-duty work cycles while maintaining internal oil film consistency and structural balance.
Advanced Sealing for Leak-Free Operation
We use a multi-layer sealing system that’s designed to handle fluctuating pressures, dirty environments, and temperature changes. The seal kit includes:
- High-pressure rod seals to contain force
- Dust wipers to block external contaminants
- Buffer rings and wear rings for lateral support
- O-rings and backup rings for static sealing at the end caps
Seals are fully compatible with NOK, Parker, or Hallite standards, providing OEM-level reliability.
This sectional diagram shows the internal structure of a hydraulic cylinder, including the piston, rod, seals, wear rings, and barrel. It helps users understand pressure zones and wear areas for better maintenance planning.
Cylinder Manufacturing Process
We follow a meticulous 3-stage production process, supported by 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.
Compatible Hitachi Models
This Komatsu arm cylinder fits a wide range of excavators, including:
- PC200 / PC210 / PC220 / PC240 / PC270
- PC300 / PC350 / PC360 / PC400 / PC450
- Support for custom cylinder lengths or pin diameters available
- PC220LC-6 Reference Part Number: 707-01-0F040
Not sure which cylinder fits your machine? Just send us your model number, casting code, or technical drawing, and we’ll confirm compatibility within 12 hours.
Maintenance Tips for Arm Cylinder Longevity
- Regularly grease pivot points and inspect for rod scratches
- Replace bushings and seals proactively during cylinder service
- Monitor for signs of internal leakage or reduced pushing power
- Avoid sudden arm retraction under full load to reduce fatigue stress
Frequently Asked Questions (FAQ)
Q: How do I confirm if this arm cylinder fits my Komatsu excavator?
A: Just send us your machine model (e.g., PC200-8), serial number, or the casting number on your old cylinder. Our team will cross-check OEM specs and confirm fitment within 12 hours.
Q: Can I reuse my old pins and bushings with a new cylinder?
A: We strongly recommend replacing worn pins and bushings when installing a new cylinder. Reusing old hardware may cause misalignment or premature wear.
Q: What seal brands do you use inside the cylinder?
A: We use OEM-grade seals, depending on your market or application needs. All seals are pressure-tested before delivery.
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.
