CATHydraulic Parts

420-9748 Hydraulic Filler Breather — Cat 239D 299D3

This hydraulic filler breather cap is designed to seal the hydraulic tank filler port, preventing contamination from entering the system while allowing air to escape. It is manufactured to meet OEM specifications for durability and proper sealing, ensuring it functions effectively where a worn or damaged cap might fail. Operators may notice increased dirt or moisture in the hydraulic oil, or potential foaming of the hydraulic fluid if this breather cap is compromised.

Hydraulic Filler Breather – Part No 420-9748 – CAT Spare Part
Part Specifications
BrandCAT
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.

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

2442228
Caterpillar Pump Gp-Ps 2442228
1P9301
Gear (12 Teeth)
2061556
Hydraulic Component
190-5841
Hose
1D4593
Cap Screw
6i4019
Caterpillar Valve Seat Insert (Inlet) 6I4019

Browse all CAT Hydraulic 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

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 TypeHydraulic Filler Breather Cap
MaterialNylon and rubber components
ApplicationHydraulic tank filler port
Service LifeReplace annually or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A damaged or missing hydraulic filler breather cap can allow dirt, water, and other debris to enter the hydraulic system, leading to accelerated wear on components. Over time, this contamination can cause hydraulic fluid degradation, increased system temperatures, and potential pump or valve damage. The worst consequence is widespread internal component wear and premature hydraulic system failure.

Installation Tip

Ensure the mounting surface on the hydraulic tank is clean and free of old sealant or debris before installing the new breather cap. Do not overtighten the cap, as this can strip the threads or damage the sealing surface.

Service Note

Inspect the hydraulic fluid for signs of contamination and check the hydraulic oil level when replacing the filler breather cap.