Description
Product Overview
The plunger spring assembly is installed inside the PT injector. High-pressure fuel pushes the plunger to compress the spring, achieving fuel injection. The spring rebounds to close the needle valve, directly determining the opening pressure and atomization effect of the fuel injection. Under long-term heavy mining conditions, high-temperature radiation in the cylinder, and high-frequency high-pressure reciprocating impact, the spring's fatigue elasticity decreases, and the plunger step wears. This can lead to abnormal injection timing, coarse fuel atomization, uneven fuel supply among cylinders, reduced equipment power, and excessive black smoke emissions from exhaust. This product features a unified standard for the outer diameter of the plunger, the wire diameter of the spring, and the positioning dimensions of the steps. After maintenance and disassembly, this assembly can be replaced separately to restore the fuel injection performance. It is suitable for large-scale mining machinery, heavy-duty trucks, and large-power diesel generator sets for the maintenance and repair of PT injectors.
Core Advantages of the Single Item
Stepwise quenching and tempering of the plunger rod, with high wear resistance and precise positioning
The plunger is fully quenched and hardened, with a multi-level ring-shaped positioning step integrated, ensuring stable limit position during reciprocating motion, without radial offset wear, and providing long-term central fuel injection and uniform atomization.
Thickened multi-layer high-pressure reset spring, with durable elasticity that is not prone to fatigue
The large-diameter alloy spring undergoes high-temperature tempering treatment, with uniform elastic parameters, and is not prone to attenuation and deformation under high-frequency reciprocating compression. Each fuel injection rebound force is consistent, eliminating speed drift and idle jitter.
Precision mating clearance is calibrated and factory-verified, ensuring high-pressure sealing without fuel backflow
The assembly gap between the plunger and the spring is strictly controlled. Under high-pressure conditions, the seal is tight, preventing fuel backflow and pressure relief, and improving the difficulty of secondary startup after engine shutdown.
All-metal temperature-resistant structure, suitable for harsh cylinder internal conditions
The entire set has no plastic wear parts, can withstand the radiation heat of the combustion chamber, isolate diesel vapor corrosion, and has a longer service life in dusty and humid environments in mining and construction sites.
Split design for separate replacement, significantly reducing maintenance costs
No need to replace the entire injector assembly. Just replacing the internal plunger spring assembly can repair abnormal pressure faults. The operation is simple, and the repair time is shortened.
Complete elastic bench testing, no need for secondary calibration after assembly
Each set is independently calibrated for the opening pressure, with uniform parameters. After replacement, the fuel injection atomization and fuel injection volume return to the standard state, and the equipment power output is stable.
Accessory List
1 piece of 6N7527 stepped plunger rod
1 root of high-pressure reset spring for matching Applicable scenarios
This product is suitable for large mining excavators with PT single-cylinder injection system, heavy-duty wheeled loaders, and high-power fixed diesel generators. It is applicable for 24-hour continuous heavy-duty operations in mines, high-temperature vibration of the engine cabin, and dusty and impure diesel environments. It is suitable for replacing the pressure regulating and injection components of heavy-duty diesel engines.
Product Basic Parameters
Product Name: 6N7527 PT Injector Plunger Spring Assembly
Part Number: 6N7527
Main Material: Tempered and hardened alloy steel plunger, high-temperature resistant alloy high-pressure spring
Structural Feature: Multi-stage stepped positioning plunger, thickened multi-layer reset spring
Application Conditions: High-frequency high-pressure reciprocating injection, continuous high-temperature in the cylinder, corrosion of impure diesel for heavy-duty diesel engines
Product Status: New and complete plunger spring assembly, factory completed with full set of bench tests for spring elasticity, clearance, and pressure durability
Packaging: Single set of independent protective packaging, both ends dust-proof protection to avoid plunger steps from being磕碰 and worn， supports single-piece retail and bulk purchase in cases， and is compatible with cross-border small package logistics.
