Suitable for Komatsu PC138US-2/8/10/11 excavator boom cylinder repair kit
The PC138US-8 boom cylinder repair kit is a replacement kit for the internal oil seals, O-rings, and guide components of the boom cylinder on Komatsu PC138US-8 / PC138USLC-8 excavators. The repair kit includes piston seals, U-rings, buffer rings, and wiper rings, and is suitable for replacement during cylinder disassembly and maintenance. It effectively prevents oil leakage, improves hydraulic performance, and extends cylinder lifespan.
| Piston Part Number |
PC138US-8 Boom Cylinder Repair Kit |
| Type |
Hydraulic Cylinder Seal Repair Kit |
| Function |
Replaces internal cylinder seals, restoring sealing and pressure-bearing performance |
| Material |
Oil-resistant rubber, polyurethane, and wear-resistant composite materials |
| Application |
Excavator hydraulic boom cylinder system |
Applicable Models
Komatsu Excavators: PC138US, PC138US-2, PC138US-8, PC138US-10, PC138US-11
Guangzhou Minshun Machinery Equipment Co., Ltd.
We specialize in the sales and service of diesel engine assemblies and construction machinery parts. Our product line covers engine assemblies, filtration systems, electronic control components, hardware accessories, wiring harnesses, and electrical accessories. Our service area includes Canada, the United States, the United Kingdom, Mexico, the Netherlands, Kazakhstan, Mongolia, Russia, Australia, Malaysia, Turkey, Indonesia, Singapore, Thailand, South America, South Africa, and other countries and regions.
Our Product Range
| Engine Rebuild Kit |
Turbochargers |
Engine Diesel Pumps |
Engine Controllers (ECU) |
| Cylinder Blocks |
Cylinder Heads |
Water Pumps |
Injectors |
| Starter Motors |
Filters |
Other Engine Accessories |
Excavator Hydraulic Pumps |
| Swivel Components |
Distributor Valves |
Travel Motor Assemblies |
Chassis Components and Other Accessories |

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Frequently Asked Questions
Q1: What is your main products?
A1: We are specialized in the excavator engine spare parts, for example Main cylinder block, cylinder head, crankshaft, Engine assembly, piston, cylinder liner, piston ring, camshaft, connecting rod, oil pump, water pump, valve series products, movement, etc. almost all parts of the entire engine.
Q2: Do you test all products before shipping?
A2: Yes, we conduct 100% testing before shipping.
Q3: Which engine models is this Hydraulic Cylinder Seal Repair Kit compatible with?
A3: This product is designed for specific diesel engine models. If you can provide the engine model or original part number, we can confirm compatibility before shipping to avoid incompatibility issues.
Q4: Can you provide cross-reference information for OEM part numbers?
A4: Yes, we support original part interchange. Please provide the original part number, and we will verify the replacement part accordingly.
Q5: What should I do if there is a problem with the product?
A5: Our products undergo professional testing and are of very stable quality. If you do find any problems, please contact us. We have a professional after-sales team to help you solve the problem.
Why Choose Us?
• Over 20 years of experience specializing in construction machinery, engines, and parts – with stable experience supplying mainstream brands and models.
• Extensive experience in model matching enables us to provide customers with accurate parts selection, reducing procurement risks.
• A long-term, stable, and reliable supply system ensures reliable product sourcing and meets continuous procurement needs.
• For product information or quotations, our professional team will provide you with detailed answers immediately upon receiving your request.