7C-3260 idler shaft 89.9 mm for CAT engine spare part

7C-3260 idler shaft 89.9 mm for CAT engine spare part Featured Image
  • 7C-3260 idler shaft 89.9 mm for CAT engine spare part

Short Description:

Gear train idler shaft for Caterpillar 3500 series engine, outer diameter 89.9 mm, supports intermediate idler gear, locates gear mesh position and stabilizes backlash of timing gear set.

Product Detail

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description

This idler shaft is fixed in the engine gear housing and serves as the stationary spindle for the idler gear. The idler rotates on bearings fitted to this shaft to transmit power and adjust gear rotation direction. It maintains stable backlash between timing and injector drive gears and acts as positioning reference for the front gear train.

It is made of quenched and tempered alloy steel. The running surface is induction hardened for wear resistance and crush resistance under alternating radial loads from gear meshing. Internal oil passages connect to the main oil gallery to supply lubrication oil continuously to the idler bearing and prevent bearing seizure.

It fits high-power 3508, 3512, 3516 diesel and gas engines for generator sets and mining machinery overhaul. The precise 89.9 mm outer diameter controls bearing running clearance. Shaft shoulder and dowel pin holes are machined to OEM drawing for reliable interchangeability.

Part Number: 7C-3260
Name: Idler shaft
Outer Diameter: 89.9 mm
Applicable Models: Caterpillar 3508, 3512, 3516, G3512, G3516 engine
Height (in): 4.5
Length (in): 6.3
Material: Low Alloy Steel
Function: Support idler gear, locate gear train and maintain backlash

Product Advantages

1. Alloy steel base with hardened surface, crush and wear resistant for continuous heavy-duty gear train of 3500 series
2. Internal oil passage feeds oil to idler bearing and reduces seizure risk under high temperature
3. Precise 89.9 mm OD with solid shoulder positioning, controls gear backlash and cuts transmission noise
4. Stable dowel hole reference for easy alignment, timing drift is less likely after overhaul replacement

FAQ 

Q: What faults are caused by scored or worn idler shaft?
A: Excessive gear backlash, rhythmic gear housing noise and timing drift. Severe cases lead to bearing failure and broken gear teeth.

Q: Can 7C-3260 be used interchangeably for left and right cylinder banks?
A: Some 3500 engines have different dowel and oil passage layouts for each bank. Check OEM drawing before cross-installation.

Q: What happens if oil passage is blocked?
A: The idler bearing loses lubrication and seizes quickly, causing gear tooth breakage and timing failure.

Q: Can excessive gear backlash be fixed only by replacing the idler shaft?
A: Not always. If idler or drive gear teeth are worn, shaft replacement alone cannot restore correct backlash.

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