High-performance PC138US-8 main pump seal kit ensuring reliable hydraulic sealing and long-lasting pump efficiency.
OEM-equivalent replacement for 708-3D-00020K main pump seal kit
Designed for Komatsu PC138US-8 hydraulic main pump
High-pressure, heat-resistant sealing materials ensuring pump stability
Prevents internal leakage, pressure loss, and pump overheating
Ideal for hydraulic repair shops, fleets, and aftermarket distributors
The YNF17722 708-3D-00020K main pump seal kit is designed for the hydraulic main pump on the Komatsu PC138US-8 excavator. As the heart of the hydraulic system, the main pump operates under extreme pressures and high temperatures, making high-quality seals essential for preventing internal leakage, maintaining system pressure, and ensuring stable machine performance.
This seal kit includes all critical components such as O-rings, piston seals, valve plate seals, shaft seals, backup rings, and wear-resistant PTFE rings. Manufactured from premium materials like NBR, HNBR, PU, and PTFE, each component withstands hydraulic shock loads, high pressure, temperature fluctuations, and abrasive contaminants.
Restoring the main pump with this seal kit helps prevent power loss, slow hydraulic response, overheating, and premature pump failure. YNF Machinery supplies professional-grade pump seal kits with consistent quality and competitive pricing—trusted by global pump rebuilders, excavator repair centers, and parts distributors.
| Parameter | Details |
|---|---|
| YNF Part Number | YNF17722 |
| OEM Number | 708-3D-00020K |
| Compatible Model | Komatsu PC138US-8 |
| Product Type | Main Pump Seal Kit / Hydraulic Pump Repair Kit |
| Applicable Pump Model | PC138US-8 hydraulic piston pump |
| Components Included | O-rings, piston seals, shaft seal, PTFE rings, backup rings |
| Material | NBR, HNBR, PU, PTFE |
| Function | Prevents leakage and restores pump pressure |
| Application | Excavator main hydraulic pump |
| Category | Hydraulic Pump Seal Kits |
| Brand | YNF |
| Origin | China |
| MOQ | 1 Set |
| Shipping Options | Sea, Air, Express |
| Payment Terms | T/T, PayPal, Western Union |
| Application Area | Description |
|---|---|
| PC138US-8 Hydraulic Pump | Restores pump sealing and pressure retention |
| Excavator Hydraulic System | Improves power output and response speed |
| Pump Rebuild & Overhaul | Essential for restoring worn or leaking main pumps |
| Aftermarket Distribution | High-demand product for Komatsu hydraulic pump repairs |
Related Products:
Komatsu Main Pump Parts
PC138US-8 Travel Motor Seal Kit (TZ467B9000-00)
Hydraulic Pump Rotating Group
Excavator O-ring Kits
PTFE Backup Rings & Wear Parts
FAQs：
Q: Is this seal kit compatible with PC138US-8 main pump?
A: Yes, it replaces OEM 708-3D-00020K and fits accurately.
Q: What materials are used?
A: NBR, HNBR, PU, and PTFE for high-pressure resistance.
Q: What is the MOQ?
A: MOQ is 1 set, ideal for urgent repair orders.
The YNF17722 708-3D-00020K main pump seal kit is engineered for reliable sealing performance in Komatsu PC138US-8 hydraulic systems. With high-pressure and wear-resistant materials, it helps restore pump efficiency, reduce internal leakage, and extend pump life. YNF Machinery ensures stable stock, strong durability, and competitive wholesale pricing—ideal for pump rebuilders, professional workshops, and parts distributors. Contact us today for fast quotations.
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