VolvoHydraulic Parts

21577511 — Diesel Exhaust Fluid (Def) Pump 21577511 21577507 For Volvo Truck Mack

This Diesel Exhaust Fluid (DEF) Pump is a critical component of the selective catalytic reduction (SCR) system, responsible for injecting precise amounts of DEF into the exhaust stream to reduce harmful emissions. It ensures compliance with emissions regulations by accurately metering the DEF, unlike a worn pump that may deliver inconsistent flow. Operators might observe a check engine light, reduced engine power, or DEF system error messages when this pump is malfunctioning.

Diesel Exhaust Fluid (Def) Pump 21577511 21577507 For Volvo Truck Mack – Part No 21577511 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryHydraulic Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeDEF Pump
MaterialCorrosion-resistant alloy
ApplicationDiesel Exhaust Fluid (DEF) System
Service LifeReplace as needed based on system diagnostics
CompatibilityVolvo, Mack
ConditionNew — OEM specification aftermarket

Failure Symptoms

An initial sign of a failing DEF pump can be a 'Check Engine' light or a specific DEF system warning. If ignored, the pump may cease to deliver DEF, leading to increased exhaust emissions and potential engine derating. The ultimate consequence is the inability to meet emissions standards, potentially resulting in the vehicle being unable to operate.

Installation Tip

Ensure the DEF tank is clean and free of any crystallization before installing the new pump to prevent immediate contamination. Do not reuse old mounting hardware or seals, as this can lead to leaks or improper seating.

Service Note

When replacing the DEF pump, it is crucial to inspect the DEF injector and lines for any signs of blockage or corrosion.