Komatsu PC150 PC150-1 Hydraulic Bucket Cylinder 21K-63-76301 110mm Bore 31.4MPa Aftermarket
1. Basic Product Info
This heavy-duty aftermarket hydraulic bucket cylinder is precision manufactured as a direct OEM replacement spare part for early-generation Komatsu PC150 and PC150-1 medium excavators. As the core hydraulic actuator of front working attachment, it drives bucket digging, soil grabbing, stone loading and material dumping operations. Widely applied in municipal renovation, road maintenance, pipeline construction, landscaping and small earthmoving jobs.
All cylinders are strictly produced in accordance with Komatsu original technical drawings and OEM standards, with fully consistent mounting dimensions, pin hole spacing and hydraulic port layout. Direct bolt-on installation without cutting, welding or any on-site secondary modification.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Bucket Cylinder |
| Applicable Model | Komatsu PC150, PC150-1 Excavator |
| OEM Part Number | 21K-63-76301 |
| Product Grade | Brand New High-Quality Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit, sufficient stock for immediate shipment |
| QC Standard | ISO9001 certified, full hydraulic pressure & cyclic fatigue testing before delivery |
2. Core Technical Parameters
| # | Part No. | Description | Qty |
|---|---|---|---|
| 1 | 21K-63-76301 | BUCKET CYLINDER A., | 1 |
| 1 | 21K-63-76340 | Cylinder | 1 |
| 2 | 707-76-70040 | Bushing | 1 |
| 3 | 07145-00070 | SEAL,DUST? PISTON ROD | 2 |
| 4 | 07020-00900 | FITTING, GREASE (STEERING CYLINDER) | 1 |
| 5 | 707-27-11170 | HEAD,CYLINDER | 1 |
| 6 | 07177-07030 | BUSHING (1) | 1 |
| 7 | 707-51-70211 | PACKING,(Y1621-01A0-9) | 1 |
| 8 | 144-63-95170 | SEAL,OIL? CYLINDER HEAD | 1 |
| 9 | 07179-00093 | RING, SNAP | 1 |
| 10 | 07000-12105 | O-RING, STEERING PUMP MOUNTING | 1 |
| 11 | 07146-02106 | RING, BACK-UP (KIT) | 1 |
| 12 | 01010-82475 | BOLT (KIT) | 4 |
| 13 | 01602-22472 | WASHER,SPRING (FOR SLAG HANDLING) | 4 |
| 14 | 21K-63-76320 | ROD,PISTON | 1 |
| 15 | 707-76-70060 | Bushing | 1 |
| 16 | 21K-70-12180 | SEAL,DUST (KIT) | 2 |
| 17 | 07020-00675 | FITTING,GREASE (WITHOUT LUB. PIPING) | 1 |
| 18 | 707-40-11380 | Retainer | 1 |
| 19 | 707-36-11380 | Piston | 1 |
| 20 | 707-44-11080 | RING,PISTON (KIT) | 1 |
| 21 | 07155-01125 | RING,WEAR (FOR WA120-1M) | 1 |
| 22 | 07165-15252 | NUT, NYLOCK | 1 |
| 23 | 21K-63-76380 | Tube | 1 |
| 24 | 21K-63-76370 | Tube | 1 |
| 25 | 07000-13030 | O-RING,BOOM (FOR 50 FEET LONG FRONT) | 2 |
| 26 | 01010-50840 | BOLT,(WITH AIR CONDITIONER) | 4 |
| 27 | 01010-50855 | BOLT,(10M) | 4 |
| 28 | 01602-20825 | WASHER,SPRING?FOR ADDITIONAL REAR LAM | 8 |
| 29 | 21K-63-15272 | Plate | 1 |
| 30 | 01010-51230 | BOLT,(NOT USED WITH EMERGENCY STR.) | 2 |
| 31 | 01643-31232 | WASHER,(NOT USED WITH EMERGENCY STR.) | 2 |
| 32 | 07283-22738 | CLIP, SEAT | 2 |
| 33 | 01599-01011 | NUT,(WITH UNDER MIRROR) | 4 |
| 34 | 01643-31032 | WASHER,(WITH AUTO EMERGENCY STEERING) | 4 |
| 35 | 07282-02793 | Clamp | 1 |
| 36 | 01010-51025 | BOLT,(FOR CANVAS CANOPY?HEAD GUARD) | 2 |
| 37 | 01602-21030 | WASHER, SPRING (SUPPLIED W/SPIDER ASSEMBLY) | 2 |
| Spec Item | Data |
|---|---|
| Bore Diameter | 110mm |
| Piston Rod Diameter | 72mm |
| Working Stroke | 1180mm |
| Rated Working Pressure | 31.4MPa |
| Factory Test Pressure | 47.1MPa (1.5 times rated working pressure) |
| Barrel Material | High-tensile seamless alloy steel with precision inner honing |
| Piston Rod | 40CrMo heat-treated steel, 28~32μm hard chrome plating, HRC68–72, excellent wear resistance & anti-bending performance |
| Matching Seal Kit PN | 21K-63-76301K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure Feature | Double reinforced ear lugs with quenched copper wear bushings, built-in buffer device to reduce reciprocating impact and noise |
3. Product Advantages
- Universal Fit for PC150 & PC150-1 Old Models
One cylinder fits both original PC150 base model and upgraded PC150-1 version. All assembly sizes, lug spacing and oil port positions fully match original PN 21K-63-76301 cylinder, seamlessly connecting bucket linkages and hydraulic pipelines for stable continuous medium-load construction operation.
- Medium-Load Reinforced Optimized Structure
Thickened cylinder barrel and joint lugs are upgraded for frequent daily construction scenarios, resisting long-term cyclic loads and minor collision abrasion to extend overall service life effectively.
- Multi-Round Strict Pre-Delivery Inspection
Each finished cylinder undergoes full-stroke reciprocating cycle test and high-pressure airtight leak detection, completely eliminating hidden internal and external oil leakage risks.
- Excellent Cost Performance
Delivers the same stability and service lifespan as genuine Komatsu OEM spare parts, greatly cutting repeated procurement costs for repair shops, equipment rental companies and global spare parts wholesalers specializing in old-model excavator parts.
- Flexible Global Logistics Support
In-stock items can be dispatched within 3 working days. Air freight handles urgent breakdown rush orders; sea freight offers cost-effective bulk wholesale shipping to Africa, Southeast Asia, Middle East and Latin American markets.
4. Supplier Brief
Our factory has over 10 years of mature experience in R&D and mass production of hydraulic cylinders for classic old-generation Komatsu PC series excavators including PC150 / PC150-1. We supply complete boom, arm and bucket cylinder assemblies with mature forging, honing and heat treatment craft, plus full-process strict quality control. Our aftermarket hydraulic cylinders are exported worldwide all year round, winning long-term trust and consistent positive feedback from global machinery spare parts dealers.
5. FAQ
Q1: Can this bucket cylinder fit Komatsu PC150-3 or PC120-1 excavators?
A: No. Different generations and models of Komatsu excavators adopt exclusive part numbers and unique structural dimensions without interchangeability. Please confirm your complete machine model before placing orders.
Q2: Does the standard package include the matching seal repair kit?
A: Seal repair kit is not included in standard delivery. You can purchase the dedicated supporting seal kit separately, and we will offer a competitive combined order quotation.
Q3: How is the cylinder packed for long-distance ocean transportation?
A: Anti-rust oil filled into cylinder inner cavity, anti-rust grease evenly coated on piston rod surface. The whole cylinder wrapped with thick waterproof PE film and packed in reinforced export plywood cases to avoid scratch, collision and moisture damage during long sea transit.
Q4: Are there tiered volume discounts for purchasing a full set of boom + arm + bucket cylinders for PC150 / PC150-1 series?
A: Yes. Complete working device cylinder set orders enjoy graded volume discounts. Consolidated FCL container shipment service is available to reduce total logistics expenditure.
Q5: What after-sales technical support if oil leakage occurs within the 12-month warranty period?
A: Please provide clear photos of leakage position plus your excavator serial number. We will arrange free seal replacement and professional remote troubleshooting guidance promptly.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.