CATEngine Parts

146-3685 Hydraulic Pump — Cat 3406

This hydraulic pump is the heart of the machine's hydraulic system, generating the necessary flow and pressure to power functions like lifting, steering, and implement operation. Constructed from high-strength materials to meet rigorous OEM specifications, it provides reliable performance and longevity over worn or failing pumps that exhibit internal wear. Operators might observe a noticeable decrease in hydraulic system performance, such as slow boom or bucket movement, or whining noises from the pump, indicating a need for replacement.

Hydraulic Pump – Part No 146-3685 – CAT Spare Part
Part Specifications
BrandCAT
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.

WhatsApp for Price & Availability☎ Call Mumbai Office

Parts Trading Company  ·  Mumbai, Est. 1956  ·  Same-day dispatch  ·  Ships worldwide  ·  GST invoice included

};

Related CAT Parts

From the same category — may also be needed

263-9001
Harness Assembly
7w-2329
Gasket
2344816
Piston
7c-3821-7e-3568
Core Assembly
377-0607-tm88302
Solenoid Valve
515-8572
Quick Coupler Link

Browse all CAT Engine Parts →

Ship This Part To Your Location

DubaiSaudi ArabiaNigeriaKenyaSouth AfricaBangladeshMalaysiaGhanaQatarEgypt
India
MaharashtraGujaratTamil NaduRajasthanKarnatakaTelangana

Full shipping information on regional pages · Air freight 2–12 days · GST invoice for India

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 TypeHydraulic Gear Pump
MaterialCast Iron, Steel
ApplicationMain Hydraulic System
Service LifeReplace as needed based on performance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A gradual loss of hydraulic power and slower implement speeds are common initial symptoms of a failing hydraulic pump. If left unaddressed, the pump can lose its ability to generate adequate pressure, leading to significantly reduced machine functionality and potential overheating of the hydraulic system. This can severely impact operational efficiency and lead to costly repairs.

Installation Tip

Always prime the new hydraulic pump with clean hydraulic oil before installation to ensure proper lubrication and prevent dry-running damage. Never reuse old seals or O-rings; replace them with new ones to guarantee a leak-free connection.

Service Note

Inspect the hydraulic system's relief valves and filters for any signs of wear or blockage when replacing the hydraulic pump.