Hydraulic systems are the lifeblood of any excavator. From lifting heavy loads to digging deep trenches, every movement depends on consistent hydraulic pressure. At the center of this system lies the hydraulic pump, and over time, its internal seals wear down. This leads to oil leaks, reduced efficiency, and, eventually, machine downtime.
The HPV118 Hydraulic Pump Seal Kit (YNF12759) is a practical, all-in-one solution to restore the health of your hydraulic pump. Whether you're running a single excavator or managing a fleet, this kit allows you to repair and rebuild the pump quickly and affordably. It’s designed to match OEM performance and fits a wide range of machines that use the HPV118 hydraulic pump.
This blog covers everything you need to know about the YNF12759 seal kit—from what's included and how to use it, to the benefits, cost savings, and maintenance tips. If you’re looking to boost reliability and reduce repair costs, this guide is for you.
What Is the HPV118 Hydraulic Pump Seal Kit?
The YNF12759 kit is a comprehensive rebuild set for the HPV118 hydraulic pump. It includes essential internal components like:
— Pistons
— Cylinder blocks
— Valve plates (left and right)
— Drive shafts and fastener pins
— O-rings, seals, and snap rings
Each part is precision-made to restore the internal pressure and functionality of your hydraulic system. With everything in one package, this kit eliminates the hassle of sourcing parts individually.
But Why Use This Kit?
Using this kit helps reduce equipment downtime and extends the life of your hydraulic pump. It's ideal for:
— Preventing and repairing hydraulic oil leaks
— Restoring factory-level hydraulic pressure
— Reducing the risk of sudden pump failure
— Saving costs compared to complete pump replacement
Compatibilty
The HPV118 Seal Kit is compatible with a wide range of excavators that use the HPV118 hydraulic pump. This includes models across different brands and applications. The kit often replaces or matches OEM part number 4451039, ensuring accurate and seamless replacement.
Kit Contents and Material Quality
This exclusive kit includes:
— 14 pistons
— 2 cylinder blocks
— 1 left valve plate and 1 right valve plate
— 2 drive shafts
— Snap rings, springs, and retaining rings
— O-rings and various gaskets
Materials used typically include HNBR, PTFE, and NBR, all of which meet ISO 9000 standards. These materials are engineered to withstand high pressures and extreme temperatures commonly found in construction machinery.
Rebuild Process (Step-by-Step)
Steps to rebuild are given as below
Step 1: Remove the hydraulic pump from the excavator.
Step 2: Disassemble all components while noting their arrangement.
Step 3: Clean all internal surfaces and parts thoroughly.
Step 4: Replace seals, O-rings, pistons, and shafts using the new kit.
Step5: Reassemble the pump according to manufacturer specs.
Step 6: Reinstall the pump, refill hydraulic fluid, and test.
This straightforward process can be completed in under a day by experienced technicians.
Maintenance Tips
Few of the tradiotional methods are:
Check hydraulic fluid every 500–1,000 hours
Inspect seals for wear or leakage regularly
Use only clean tools and fluids during rebuild
Keep detailed service records for each machine
Proactive maintenance ensures the pump performs at peak efficiency and prevents downtime.
The HPV118 Hydraulic Pump Seal Kit (YNF12759) stands out as a cost-effective and reliable solution for excavator maintenance. It’s built for professionals who want to avoid machine downtime and keep their equipment performing at its best. With precise engineering and compatibility across multiple excavator models, this kit makes the hydraulic pump rebuild process simple and efficient.
Instead of spending thousands on a new hydraulic pump, this all-in-one kit allows you to restore your existing system for a fraction of the cost. From pistons and valve plates to high-grade seals and O-rings, each part is made to handle the demands of heavy construction work.
The benefits go beyond savings. You get faster turnaround, less guesswork during repairs, and the confidence that your machine can handle tough jobs without leaks or pressure loss. Whether you manage a single excavator or a full fleet, this kit helps extend equipment lifespan and maintain job site productivity.
Choosing the YNF12759 kit is more than a repair decision—it’s a strategic investment in uptime, reliability, and long-term machine health. If keeping your hydraulic system strong is a priority, this is the kit to count on.