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Air Compressor Assy 134151-9020
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Product Overview
This plunger and barrel assembly is a precision-matched pair that forms the pumping element inside a diesel fuel injection pump. The plunger reciprocates within the barrel to pressurize fuel to injection pressure; the clearance between the two components is measured in microns, and their matched fit is what allows the pump to build pressure without excessive leakage. This assembly is identified by the P170 element type and serves as the service replacement for worn or failed pumping elements in the corresponding injection pump.
When a plunger element wears, the symptoms typically appear as hard starting, rough idle, reduced power, or erratic fuel delivery—because the pump can no longer generate consistent pressure across all cylinders. Replacing the matched plunger-and-barrel pair restores the metering precision the injection pump depends on.
Technical Specifications
Parameter Specification Part Number 134151-9020 Element Type P170 Component Plunger and barrel assembly (matched pair) Application Diesel fuel injection pump, heavy equipment Net Weight Approx. 0.136–0.141 kg (136–141 g) Length 29 mm (element) Packaging Dimensions Approx. 11 × 8.5 × 4.5 cm (retail packaging) Material Bearing-grade steel, precision-matched pair Cross-Reference 9443610557 / 9 443 610 557; ZEXEL H134151902; 1341519020 (unhyphenated) Weight and dimensions are nominal and may vary slightly by production batch. The plunger and barrel are a matched set and must be installed together—do not mix components from different pairs.
Compatibility
Machine / Application Notes MEGA 400-III PLUS wheel loader Primary application SOLAR 420LC-V excavator Primary application SOLAR 470LC-V excavator Primary application SOLAR 500LC-V excavator Primary application SOLAR 340LC-7 / 340LC-V excavator Listed in cross-reference fitment data SOLAR 400LC-V excavator Listed in cross-reference fitment data Fitment note: This plunger is also referenced in listings for several DX-series crawler excavators and the MEGA 400-V. Because injection pump configurations can change across serial number breaks and model revisions, confirm the element type (P170) and part number against the existing pump or element before ordering—machine model name alone is not a reliable fitment guide for internal pump components.
FAQ
Q: Is this a genuine part?
A: Yes. This is a genuine replacement part manufactured to the corresponding specification for this reference number. The plunger and barrel are supplied as a matched pair.
Q: What does a fuel pump plunger do?
A: The plunger moves up and down inside the barrel to pressurize diesel fuel to the very high pressure needed for injection. The fit between plunger and barrel is what seals the pumping chamber; as this fit wears, pressure drops and engine performance degrades.
Q: How do I know if my plunger needs replacement?
A: Common symptoms include hard cold starting, misfire or rough running under load, black or white smoke, fuel dilution of engine oil, and a general loss of power that does not respond to filter or injector service. A diesel injection shop can bench-test the pump to confirm whether the plunger elements are the cause.
Q: Can I replace just the plunger, or do I need the barrel too?
A: The plunger and barrel are a precision-matched pair. Replacing only one component will not restore the correct running clearance. This assembly is supplied as a matched set and both components should be installed together.
Q: Is this a DIY installation?
A: No. Replacing plunger elements requires disassembly of the injection pump, specialized tooling, and a clean-room-level work environment to avoid contamination. The pump must be recalibrated on a test bench after assembly. This is a repair for a qualified diesel fuel injection specialist.
Q: What is the P170 designation?
A: P170 identifies the element size and type within the P-series plunger family. Elements with different P-numbers differ in diameter, stroke, or port configuration and are not interchangeable.
Part numbers and model references are used for identification and fitment reference only.
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