CATEngine Parts

6n-9550-150bmr Air Starter Motor — Cat 3306

This is a high-performance Air Starter Motor, designed to provide reliable engine starting for large diesel engines. It utilizes compressed air to spin the engine's flywheel, offering a robust alternative to electric starters, especially in extreme temperature environments. A worn starter motor may exhibit slow cranking, failure to engage, or a distinct lack of starting power. Operators will experience difficulty or inability to start the engine, potentially leading to operational delays.

Air Starter Motor – Part No 6n-9550-150bmr – 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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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 TypeAir Starter Motor
MaterialSteel and hardened alloys
ApplicationEngine starting system
Service LifeReplace every 5,000 hrs or 3 years
CompatibilityCAT 3306, D320, D320A, D333C, D34 engines
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common symptom of a failing air starter motor is a slow or weak engine crank, or the starter failing to engage the flywheel. If ignored, the engine may become increasingly difficult to start, eventually leading to a complete inability to crank. The primary risk is extended equipment downtime due to an unstartable engine.

Installation Tip

Before mounting, ensure the air supply lines are clean and free of moisture or debris that could clog the starter's internal components. Do not overtighten the mounting bolts, as this can distort the starter housing.

Service Note

Inspect the air supply system, including the compressor, tank, and lines, for leaks or blockages when replacing the air starter motor.