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MSG MODEL(4WD) 7B-105 2) NOISY OPERATION Checkpoint Trouble Cause Countermeasure Replenish or replace the engine oil Insufficient or improper engine oil NG Replace the gear(s) Replace the gear(s) Replace the bearing(s) Gears (Gear whining) Lack of backlash between meshing gears Free running gears seizing on the thrust face or the inner face Bearings (Hissing, thumping or bumping) Worn or broken bearing(s) Gears (Squealing at high speeds) Replace the gear(s) Gears (Growling, humming, or grinding) Worn, chipped, or cracked gear(s) NG NG NG NG OK OK OK OK Engine oil (Metallic rattling) |