CATHydraulic Parts

4N0429 Gear-Pump — Cat 120G 12G

This is a Caterpillar Gear Pump, a fundamental component of the hydraulic system responsible for generating hydraulic flow and pressure. It is manufactured to meet OEM quality standards, ensuring consistent performance and longevity compared to a worn or damaged pump. Operators may experience a loss of hydraulic power, slow or erratic operation of hydraulic functions, or unusual noises from the hydraulic system when this gear pump fails.

Gear-Pump – Part No 4N0429 – 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.

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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 TypeGear Pump
MaterialCast iron and steel
ApplicationHydraulic system
Service LifeReplace as needed based on inspection
Compatibility120G, 12G, 140B, 140G, 14G
ConditionNew — CTP aftermarket replacement

Failure Symptoms

A failing gear pump may initially manifest as a decrease in hydraulic system pressure or flow, leading to sluggish implement movement. If ignored, the pump's internal components can wear further, resulting in a significant loss of hydraulic power and potentially damaging other system components. Continued operation with a worn gear pump risks complete hydraulic system failure, rendering the equipment inoperable.

Installation Tip

Ensure the hydraulic reservoir is filled with the correct type and amount of fluid before starting the pump to prevent dry running. Avoid overtightening the pump mounting bolts, as this can distort the pump housing and affect gear alignment.

Service Note

Inspect hydraulic filters, fluid lines, and the hydraulic reservoir for contamination when replacing the gear pump.