Description
Product Overview
The 1021 plunger pair is a core precision-matched component for establishing high-pressure fuel in the mechanical fuel injection pump. It consists of a plunger rod and a matching sleeve, which are used together. The plunger's reciprocating motion compresses the fuel to form the injection pressure. Over time, the wear on the mating surfaces increases, resulting in oil pressure leakage and a decline in the supply flow rate. The complete replacement can immediately fix the problem of insufficient pump pressure, eliminating the need for separate matching of individual components and significantly reducing the maintenance time for the pump. It is suitable for various construction machinery, freight vehicles, and diesel pumps for mechanical refurbishment and maintenance of various types of construction machinery and freight vehicles.
Unique Core Features of the Single Product
Precision-matched pair with constant clearance for pressure retention
The plunger rod and sleeve are precisely machined as a set and their mating clearance is precisely calibrated. The reciprocating sliding resistance is low, and the fuel leakage under high-pressure conditions is extremely low. It continuously and stably maintains the supply pressure, preventing sudden changes in power.
Multi-stage stepped segmented sleeve, buffering high-pressure impact
The sleeve adopts a multi-stage outer diameter stepped design, which distributes the high-pressure impact force among multiple segments. The large-diameter base accepts the main oil pressure load, while the upper segment has a small diameter for precise pressure control. Long-term high-pressure operation is less likely to cause inner wall rounding or deformation.
Spiral inclined groove plunger rod, precisely controlling fuel supply volume
The plunger head is equipped with a standard spiral control oil groove. By rotating the plunger, the fuel supply stroke can be adjusted, and the fuel injection volume can be adjusted according to different load conditions. It is suitable for the power adjustment requirements of various types of diesel equipment.
Overall hardened mirror surface treatment, wear-resistant and scratch-resistant, not prone to wear
The entire set of components undergoes hardening treatment, with the inner and outer walls polished to a mirror finish. Diesel impurities and gum friction are less likely to cause scratches. The mating clearance does not expand rapidly under long-term high-frequency reciprocating motion, prolonging the service life of the pump.
Separate assembly packaging, no need to separately select components for maintenance
The plunger rod and sleeve are fully assembled as a set. There is no need to separately check the size and match the small components. The maintenance store can batch prepare for inventory, and the entire set of worn core components can be replaced simultaneously upon disassembling the pump.
Application Scenarios
Suitable for corresponding series of mechanical inline fuel injection pumps, widely used in heavy trucks, loaders, mining equipment, fixed diesel generator sets, and suitable for all-weather heavy-duty conditions in construction sites and road transportation.
Product Basic Parameters
Product Name: 1021 Precision Plunger Pair (Plunger + Sleeve Set)
Part Number: 1021
Main Material: High-hardness alloy steel
Structural Feature: Spiral inclined groove plunger rod, multi-stage stepped sleeve, precision-matched separate assembly
Application Conditions: Continuous heavy load, high dust, alternating high and low temperatures diesel mechanical fuel supply system
Product Status: New complete set of precision components, completed with sliding sealing performance and high-pressure pressure retention performance testing
Packaging: Independent separated protective packaging, the plunger and sleeve are separately protected to avoid磕碰划伤 the mating mirror surface， suitable for cross-border small-item logistics
