CATEngine Parts

158-9090 Hydraulic Pump — Cat

This hydraulic pump is the heart of the hydraulic system, generating the flow and pressure needed to operate various functions like boom, stick, and bucket movements. It is built to meet strict OEM quality specifications, providing reliable and efficient fluid power, unlike worn pumps that lose capacity. Operators may observe slow or erratic hydraulic functions, a whining noise from the pump, or a general loss of hydraulic system performance when this component is failing.

Hydraulic Pump – Part No 158-9090 – 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.

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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 Pump
MaterialCast Iron and Steel
ApplicationHydraulic System
Service LifeReplace as needed based on hydraulic system performance
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Early signs of a failing hydraulic pump include sluggish or erratic operation of hydraulic functions and a noticeable increase in system noise. If the problem persists, hydraulic power will continue to diminish, potentially leading to a complete loss of function. Continued operation risks overheating the hydraulic oil and damaging other system components.

Installation Tip

Ensure the hydraulic system is completely flushed of old fluid and any potential contaminants before installing the new pump. Never run the pump dry, and prime it according to the manufacturer's instructions before initial startup.

Service Note

Inspect hydraulic filters, hydraulic oil, and all hydraulic lines and cylinders for contamination or wear when replacing the hydraulic pump.