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707-01-0CA41 Komatsu PC1250 Arm / Stick Cylinder Aftermarket
707-01-0CA41 Komatsu PC1250 Arm / Stick Cylinder Aftermarket
Heavy-Duty Arm & Stick Cylinders for Komatsu PC1250 Series.
Part Numbers: 21N-63-03121, 707-01-0CA41.
Versatility: Solutions for both Backhoe (Stick) and Front Shovel (Arm) configurations.
Durability: Mining-grade hardened rod for high impact.
Fitment: Direct OEM Replacement.
Warranty: 1 Year Factory Warranty.
The PC1250 Arm Cylinder (Stick Cylinder) is a heavy-duty hydraulic replacement engineered for the Komatsu PC1250-7 and PC1250-8 mining excavators. This comprehensive product line covers multiple OEM specifications, including 21N-63-03121 and 707-01-0CA41, ensuring we have the right cylinder for your specific machine configuration.
Whether you are operating a Backhoe (Standard Boom) for mass excavation or a Front Shovel (Loading Shovel) for face loading, SEIGO Machinery manufactures these cylinders to handle the immense crowding forces and high-impact vibrations typical of 100-ton class mining machines.
Technical Specifications
| Feature | Specification |
| Compatible Part Numbers | 21N-63-03121 / 707-01-0CA41 |
| Machine Compatibility | Komatsu PC1250-7, PC1250-8, PC1250SP-8 |
| Configurations | Supports Backhoe Stick & Front Shovel Arm Specs |
| Position | Arm Cylinder / Stick Cylinder |
| Rod Material | 42CrMo4 Induction Hardened (Rock Impact Resistant) |
| Sealing System | NOK / Parker (High-Pressure & Dust Proof) |
| Tube Material | ST52 / E355 High-Tensile Honed Tube |
| Warranty | 12 Months / 2000 Hours |
| Condition | 100% New Manufacturing |
Key Features & Mining Performance
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Dual Configuration Support: We supply exact-fit replacements for both standard stick cylinders (Backhoe) and heavy-duty arm cylinders (Front Shovel), allowing fleet managers to source all PC1250 hydraulic components from a single trusted manufacturer.
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Superior Rod Strength: The piston rods are manufactured from quenched and tempered 42CrMo4 steel with deep induction hardening. This ensures the stick cylinder resists bending during deep digging and the shovel arm withstands face impact.
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Extended Seal Life: Equipped with premium NOK buffer rings and U-cups, our cylinders are designed to prevent internal bypassing even under the extreme pressure spikes of “crowding” hard rock.
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OEM Dimensional Accuracy: Strictly machined to OEM pin-to-pin dimensions and port locations for 21N-63-03121 and 707-01-0CA41, ensuring a hassle-free installation.
Applications
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Open-pit mining (Coal, Iron, Copper)
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Quarry mass excavation
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Overburden removal
FAQ
Q1: Are 21N-63-03121 and 707-01-0CA41 different cylinders?
A: No — they are the same cylinder. Komatsu uses two numbering systems that occasionally reference the same part: the 21N-series is the legacy component-code system, and 707-series is the unified hydraulic numbering. The physical cylinder is identical.
Q2: Does this cylinder fit the PC1250-7 and PC1250-8?
A: Yes. Both PC1250-7 and PC1250-8 use the same arm cylinder design. This part covers both machine generations.
Q3: What’s the expected service life?
A: In continuous mining operation, expect 5,000-7,000 operating hours between seal services. Rod life typically exceeds 12,000 hours with proper filtration.
