PC1250SP-8 Hydraulic Bucket Cylinder for Komatsu Excavator Spare Parts 21N-70-00412 Aftermarket High Quality
More Branded Accessories are Available
| Hydraulic Parts | Hydraulic Pump | Final Drive | Travel Reduction |
| Swing Motor | Swing Reduction | Control Valve | Gear Parts |
| Slew Bearing | Engine Assembly | Hydraulic Cylinder | ECU |
Komatsu PC1250SP-8 Hydraulic Bucket Cylinder | PN:21N-70-00412 | Premium Aftermarket Replacement
1. Basic Product Info
High-quality aftermarket bucket hydraulic cylinder with OEM part number 21N-70-00412, direct replacement for Komatsu PC1250SP-8 large mining excavator. It controls bucket opening and closing for heavy mining, quarry excavation and bulk material loading. Manufactured strictly per original OEM drawings, identical mounting dimensions, pin spacing and oil port layout enable direct bolt-on installation without on-site modification.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Bucket Cylinder |
| Applicable Model | Komatsu PC1250SP-8 |
| OEM Part No. | 21N-70-00412 |
| Product Grade | Brand New Premium Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit available from stock |
| QC Standard | ISO9001 certified, full hydraulic pressure test before delivery |
2. Core Technical Parameters
| # | Part No. | Description | Qty |
|---|---|---|---|
| 1 | 21N-70-00412 | LINK ASS'Y | 1 |
| 1 | 21N-70-00411 | LINK ASS'Y | 1 |
| 1 | 21N-70-00410 | LINK ASS'Y | 1 |
| 1 | ---- | LINK | 1 |
| 1 | ---- | LINK | 1 |
| 1 | ---- | LINK | 1 |
| 2 | 21N-70-12170 | Bushing | 4 |
| 3 | 07020-00675 | FITTING,GREASE (WITHOUT LUB. PIPING) | 1 |
| 4 | 07020-00000 | FITTING, GREASE - UPPER HINGE PIN | 1 |
| 5 | 209-72-11261 | SEAL (KIT) | 4 |
| 6 | 21N-70-33221 | LINK | 2 |
| 7 | 21N-72-11230 | SHIM? 1.0MM | 5 |
| 8 | 21N-72-11230 | SHIM? 1.0MM | 5 |
| 9 | 21N-70-33130 | Pin | 1 |
| 10 | 21T-72-73170 | STOPPER | 1 |
| 11 | 01010-81645 | BOLT,(FOR 60TON DUMP BODY) | 3 |
| 12 | 01643-31645 | WASHER,(FOR TRAVEL MOTOR) (NOT SHOW) | 3 |
| 13 | 21N-70-33130 | Pin | 1 |
| 14 | 21T-72-73170 | STOPPER | 1 |
| 15 | 01010-81645 | BOLT,(FOR 60TON DUMP BODY) | 3 |
| 16 | 01643-31645 | WASHER,(FOR TRAVEL MOTOR) (NOT SHOW) | 3 |
| 17 | 21N-70-33142 | Pin | 1 |
| 18 | 209-70-73180 | HOLDER | 1 |
| 19 | 01010-82460 | CAPSCREW | 3 |
| 20 | 01643-32460 | WASHER,(WITHOUT ROPS GUARD? CANOPY) | 3 |
| 21 | 21N-70-33161 | Pin | 1 |
| 22 | 209-70-73180 | HOLDER | 1 |
| 23 | 01010-82460 | CAPSCREW | 3 |
| 24 | 01643-32460 | WASHER,(WITHOUT ROPS GUARD? CANOPY) | 3 |
| 25 | 21N-70-32140 | Pin | 1 |
| 26 | 207-70-11340 | SPACER? 0.8MM | 6 |
| 27 | 21N-70-33170 | STOPPER | 1 |
| 28 | 01010-81645 | BOLT,(FOR 60TON DUMP BODY) | 3 |
| 29 | 01643-31645 | WASHER,(FOR TRAVEL MOTOR) (NOT SHOW) | 3 |
| 30 | 21N-70-13150 | O-ring | 2 |
| 31 | 21N-72-11230 | SHIM? 1.0MM | 3 |
| 32 | 07000-16215 | O-ring | 2 |
| Spec Item | Data |
|---|---|
| Bore Diameter | 180mm |
| Piston Rod Diameter | 125mm |
| Working Stroke | 1120mm |
| Rated Working Pressure | 34.3MPa |
| Factory Test Pressure | 51.45MPa (1.5 times rated working pressure) |
| Barrel Material | High-tensile seamless alloy steel, precision inner honing |
| Piston Rod | 40CrMo tempered steel, 28~32μm hard chrome plating, HRC68~72 anti-wear & anti-deformation |
| Matching Seal Kit PN | 21N-70-00412K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure | Double ear lugs with quenched copper wear bushings, built-in impact buffer device |
3. Product Advantages
- 1:1 OEM Interchange: Fully consistent with original size and structure, perfectly matched with bucket linkage and hydraulic pipelines.
- Mining-grade Reinforced Design: Thickened cylinder body and lug base withstand extreme heavy load and frequent rock impact.
- Strict Pre-delivery Inspection: Each cylinder passes full-stroke cycle test and high-pressure tightness test to eliminate oil leakage risks.
- High Cost Performance: Equivalent service performance as genuine parts while reducing 40%~50% procurement cost.
- Flexible Logistics: In-stock goods ship within 3 working days; air freight 3~7 days for urgent orders, sea shipment 30~40 days for bulk orders.
4. Supplier Brief
We specialize in Komatsu large mining excavator hydraulic cylinders for over 11 years, supplying complete boom, arm and bucket cylinders for PC800, PC1250 series. Our products are widely exported to mining areas, Africa, Southeast Asia and Middle East spare parts markets.
5. FAQ
Q1: Can this cylinder fit other PC1250 series models?
A: It is specially designed for PC1250SP-8, not compatible with PC1250-7 and other old versions.
Q2: Is the seal repair kit included in standard package?
A: Standard product does not contain seal kit. The matched repair kit 21N-70-00412K can be purchased separately with bundle discount.
Q3: What packaging is used for long-distance sea transportation?
A: Inner cavity filled with anti-rust oil, piston rod coated with anti-rust grease, wrapped with waterproof PE film and packed in solid export plywood case.
Q4: Can I get discount for ordering full set of boom, arm and bucket cylinders?
A: Combined order enjoys tiered unit price discount and consolidated shipment to save logistics cost.
Q5: How to solve oil leakage problem within warranty period?
A: Provide clear photos of leakage position and excavator serial number, we offer free replacement seal kit and remote technical guidance.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.