HPK055 piston for excavator hydraulic pump

High-precision pump piston HPK055 replacement

Excavator rotating group piston component

Replacement piston for HPK055 hydraulic system

YNF17044 Piston HPK055 Hydraulic Pump Piston for Excavator Main Pump Rebuild

YNF17044 piston for HPK055 delivers stable hydraulic performance and restores pressure output in excavator main pumps.

Manufactured for HPK055 hydraulic pump rebuild applications
Precision machining ensures smooth piston travel and reduced leakage
Heat-treated alloy steel provides high strength and wear resistance
Ideal for excavator pump pressure restoration and system overhaul
Suitable for aftermarket distributors, pump rebuilders, and repair shops

Get A Free Quote

Products Categories

Excavator Coupling

Excavator Rubber Parts

Hydraulic Seal Kit

Excavator Electric Parts

Diesel Engine

Engine Parts

Hydraulic Pump Assembly

Excavator Swing Motor

Excavator Final Drive Travel Motor

Hydraulic Parts

Filters

Excavator Undercarriage Parts

Case Excavator Parts

Caterpillar Excavator Parts

Cummins Engine Parts

Doosan Excavator Parts

Daewoo Excavator Parts

Hitachi Excavator Parts

Hyundai Excavator Parts

Isuzu Engine Parts

JCB Excavator Parts

KATO Excavator Parts

Kobelco Excavator Parts

Komatsu Excavator Parts

Kubota Excavator Parts

Sumitomo Excavator Parts

Volvo Excavator Parts

Yanmar Excavator Parts

Excavator Bearings

Excavator Pin Bushings

Get A Free Quote

HPK055 Pump Piston Description

The YNF17044 piston, designed for HPK055 hydraulic pumps, is a core rotating group component responsible for generating consistent hydraulic output and maintaining pump efficiency. As pistons operate under high pressure and continuous motion, wear or scoring can significantly reduce hydraulic performance, resulting in pressure loss, overheating, noise, and slow machine response.

Built with heat-treated alloy steel and finished through precision CNC machining, the YNF17044 piston offers excellent hardness, smooth surface finish, and reliable sealing performance within the cylinder block. These features reduce internal leakage and friction, improving pump efficiency and extending overall service life.

This piston is widely used by hydraulic rebuild shops, excavator maintenance centers, and aftermarket distributors. Replacing worn pistons during pump overhauls ensures stable hydraulic output, faster machine response, and reduced downtime—critical for excavators operating in demanding construction and mining conditions.

HPK055 Hydraulic Piston Technical Data Sheet

Parameter	Details
YNF Part Number	YNF17044
Pump Model	HPK055
Product Type	Hydraulic Pump Piston / Rotating Group Component
Material	Heat-treated alloy steel
Machining	Precision CNC grinding
Durability	High hardness, pressure-resistant, wear-resistant
Function	Converts hydraulic pressure into mechanical motion
Application	Excavator hydraulic pump overhaul & rebuild
Installation	Direct-fit aftermarket replacement
Brand	YNF
Origin	China
MOQ	1 Piece
Shipping Options	Air, Sea, Express
Payment Terms	T/T, PayPal, Western Union

HPK055 Pump Piston Applications

Application Area	Description
Hydraulic Pump Rebuild	Replaces worn pistons in HPK055 rotating group
Excavator Pump Overhaul	Restores hydraulic pressure and flow performance
Construction Machinery Repair	Suitable for high-hours excavator maintenance
Mining & Earthmoving Equipment Service	Withstands heavy load and long working cycles
Aftermarket Parts Distribution	Ideal for wholesalers and hydraulic repair shops

HPK055 Hydraulic Pump Piston Detail Display

FAQs

Related Products:

HPK055 Cylinder Block / Rotor
HPK055 Valve Plate Set
Hydraulic Pump Piston Shoe Set
Excavator Main Pump Rebuild Kit

FAQs：

Q: Is this piston compatible with HPK055 pumps?
A: Yes, it is manufactured specifically for HPK055 pump applications.
Q: What symptoms indicate piston wear?
A: Pressure loss, overheating, internal leakage, slow hydraulic response.
Q: What material is used?
A: Heat-treated alloy steel for high wear resistance.
Q: Is a full rotating group available?
A: Yes, matching cylinder block, valve plates, piston shoes can be supplied.

Get Free Quote for HPK055 Piston YNF17044

The YNF17044 HPK055 piston is engineered for stable hydraulic performance, offering excellent durability, precise machining, and reliable sealing. It restores pump pressure and improves excavator working efficiency, making it an ideal choice for rebuilders, parts distributors, and maintenance workshops. YNF Machinery provides strong packaging, competitive wholesale pricing, and fast global shipping. Send your inquiry now to get detailed pricing.

Get A Free Quote Now