CATEngine Parts

0996581-099-6581 Gear Ring — Cat Engine 4D32 Excavator E70B

This Gear Ring is a crucial component of the starting system, designed to engage with the starter motor pinion to initiate engine rotation. It is precision-machined from high-strength steel to withstand the high forces involved in engine cranking, unlike a worn ring with chipped or rounded teeth that can cause the starter to slip or fail to engage. Operators will typically hear the starter motor spinning but not engaging the engine, or experience a grinding noise during attempted starts.

Gear Ring – Part No 0996581-099-6581 – 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 TypeGear Ring (Flywheel Ring Gear)
MaterialHardened Steel
ApplicationEngine Starting System (Flywheel)
Service LifeReplace as needed during starter system overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a worn gear ring is often a starter that spins freely without engaging the engine, sometimes accompanied by a grinding sound. If the teeth become significantly damaged, the starter may intermittently fail to crank the engine, leading to unreliable starting. Continued use with a damaged ring can also cause accelerated wear on the starter pinion.

Installation Tip

Ensure the flywheel surface where the gear ring mounts is perfectly clean and free of oil or debris, as this is critical for proper seating and heat transfer during installation. Avoid using excessive force or hammering the gear ring into place.

Service Note

When replacing the gear ring, it is essential to inspect the starter motor pinion gear for wear and the flywheel for any cracks or damage.