390-0477 idler shaft CAT engine spare part

390-0477 idler shaft CAT engine spare part Featured Image
  • 390-0477 idler shaft CAT engine spare part

Short Description:

Part No.390-0477, caterpillar engine idler shaft, supports timing idler gear and keeps stable gear backlash, replacement spare part for timing gear housing.


Product Detail

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description

This 390-0477 idler shaft is made of high-grade alloy structural steel with quenching and tempering treatment. The mating surface is high-frequency hardened and precision ground. It acts as the supporting spindle for timing idler gear, bears alternating gear load and fixes idler position to ensure smooth gear train operation. It reduces the risk of gear jumping, abnormal noise and timing drift, suitable for wheel loaders, mining dump trucks and generator sets for timing gear box overhaul.

Part No.：390-0477
Name：Idler Shaft
Height (mm): 190.5
Width (mm): 147.32
Length (mm): 147.32
Material: Low Alloy Steel
Process：Quenching & tempering + high-frequency hardening + precision OD grinding
Structure：Solid straight shaft with locating shoulder
Package：Shaft only, idler gear, bearing and snap ring sold separately
Application：Cat heavy-duty diesel engine, wheel loader, mining dump truck, generator set

Product Advantages

1. Precise shoulder dimension limits axial movement of idler and keeps gear alignment
2. Hardened mating surface delivers good wear resistance and anti-fatigue performance
3. Tempered shaft body has good toughness and impact resistance, not easy to bend under heavy load
4. Fine surface finish benefits bearing fit and reduces heat and wear
5. OD and straightness inspected before delivery, suitable for timing system stock

FAQ 

Q：Can 390-0477 interchange with other idler shafts?
A：Random interchange is not allowed. Shaft diameter and shoulder length differ, causing uneven gear wear.

Q：Can the idler shaft be reused after light scratches on mating surface?
A：It can be used temporarily if dimension stays within tolerance. Deep grooves require replacement to prevent bearing seizure.

Q：How to store the idler shaft properly?
A：Protect the mating surface, apply anti-rust oil and fit dust cover, avoid impact scratches.

Q：Which parts are recommended to replace together with the idler shaft?
A：Matching idler bearing, snap ring and gasket are suggested to replace together for longer timing service life.

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