Description
Product Overview
The plunger assembly is the core component for establishing high-pressure fuel in a single pump. The gear at the tail end meshes with the pump body drive mechanism to transfer power. The cam drives the plunger to compress the spring to complete the oil pumping, and the spring's rebound realizes the oil suction cycle. After long-term heavy-load, high-temperature reciprocating operations in mining areas, the gear tooth surfaces wear, the plunger is scratched, and the spring elasticity decreases. This can lead to insufficient oil supply stroke, fluctuating oil pressure, significant decline in engine power, and increased fuel consumption. This product comes with a pre-installed set of plunger, drive gear, limit spacer, and reset spring, eliminating the need for separate selection of scattered parts. The factory completes a comprehensive set of tests for sealingity, elasticity, and meshing accuracy, and is suitable for maintenance of single pumps for heavy mining excavators, heavy-duty trucks, and large diesel generator sets.
Unique Core Features of the Single Product
The tail end is an integrally formed drive gear, with stable and wear-resistant meshing transmission.
The rear end of the plunger is machined with an integrated gear tooth head, with a standard and precise tooth shape that perfectly meshes with the pump body drive gear. The power transmission has no slack or slipping, and the long-term reciprocating rotation is less likely to break the teeth or cause tooth surface wear, ensuring synchronous oil supply by the plunger and balanced fuel injection for each cylinder.
The entire hardened and nitrided plunger rod is mirror-polished to prevent scratching and internal leakage.
The main body of the plunger is processed from high-hardness alloy steel, with surface nitriding hardening + mirror polishing. The gap between the plunger and the pump barrel is extremely small, and the high-pressure diesel washing is less likely to cause scratches, significantly reducing internal oil pressure leakage and pressure drop, and ensuring a stable supply pressure for a long time.
The large-diameter high-temperature alloy spring is not prone to fatigue and softening under full-load conditions.
The matching thickened high-temperature tempering reset spring is resistant to high temperatures and fatigue compression. Its elasticity does not decline for 24 hours under continuous heavy-load conditions. The plunger returns to the reset position each time, eliminating interruptions in oil supply, idle jitter, and single-cylinder lack of power faults.
The thickened metal positioning spacer at both ends buffers and limits shock and vibration accurately.
The wear-resistant steel spacer at both ends of the spring isolates the contact surface between the spring and the plunger and the pump body, buffering reciprocating impact and vibration, reducing metal friction noise, and limiting spring deviation to avoid unilateral wear of the plunger.
The side positioning oil hole design ensures smooth oil circulation and prevents carbon buildup.
A standard oil guide hole is reserved at the plunger head to allow diesel to circulate and remove impurities and gums, reducing the probability of plunger sticking and injector hole blockage, prolonging the service life of the entire plunger assembly, and reducing maintenance frequency. Applicable scenarios
It is suitable for heavy-duty freight trucks, large mining excavators, heavy-duty loaders, high-power fixed diesel generator sets that are equipped with corresponding mechanical single pump systems. It is applicable to mining areas and construction sites for 24-hour full-load operation under high temperature and high dust conditions. It is suitable for the overhaul of heavy-duty diesel power injection systems of heavy machinery with single pumps.
Product basic parameters
Product name: Gears-mounted single pump plunger assembly
Part number: 7W0182
Main material: Nitrided hardened alloy steel plunger, high-temperature alloy reset spring, wear-resistant steel positioning pad, integrated drive gear
Structural features: Tail gear drive end, complete set of plunger + spring + double positioning pad, mirror-finished precision plunger rod, side-side oil flow holes
Application conditions: 24-hour continuous full-load operation, long-term high-temperature in the engine compartment, outdoor high-dust heavy machinery diesel engine single pump
Product status: New complete set of plunger components, factory completed with full set of detection for gear meshing accuracy, spring elasticity, plunger clearance, and high-pressure sealing performance
Packaging: Each single unit is separately packaged in a protective tube, with protective covers added to both ends of the gear and plunger to prevent damage to the precision tooth surfaces and plunger working surfaces during transportation. Supports single-unit, multi-unit batch purchases, and is compatible with cross-border small-package logistics.
