VolvoEngine Parts

20409365 — Vacuum Switch 20409365 20560843 For Volvo Engine Tad570 Tad840Ge Truck Fh Bus B5Lh B8L

This vacuum switch acts as a pressure-sensitive electrical switch, typically used to activate or deactivate a circuit based on changes in vacuum or pressure within a system. It is designed to operate reliably under engine conditions, ensuring proper function of associated components like warning lights or control modules. A malfunctioning vacuum switch can lead to incorrect system operation or failure to alert the operator to a problem. Observable symptoms might include a warning light that stays on or fails to illuminate when it should.

Vacuum Switch 20409365 20560843 For Volvo Engine Tad570 Tad840Ge Truck Fh Bus B5Lh B8L – Part No 20409365 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine 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

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

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

Part TypeVacuum Switch
MaterialPlastic and metal
ApplicationVarious engine control circuits
Service LifeReplace as needed based on diagnostics
CompatibilityVolvo Engine TAD570, TAD840GE, Trucks FH, Buses B5Lh, B8L
ConditionNew — OEM specification aftermarket

Failure Symptoms

A primary symptom of a faulty vacuum switch is an incorrect or absent indicator light function related to the system it monitors. This can lead to a lack of warning for critical conditions, such as low oil pressure or high engine temperature. The worst-case scenario is operating the equipment without awareness of a developing fault, potentially causing significant engine damage.

Installation Tip

Ensure the vacuum or pressure port is clean and free of obstructions before connecting the hose or fitting. Avoid overtightening the switch into its threaded port, as this can crack the housing.

Service Note

Inspect all associated vacuum lines or pressure hoses for leaks or damage when replacing the vacuum switch.