1987-Montero · Intro maint a · страница 30 из 58 · Открыть оригинал PDF ↗
WHEEL BEARING TROUBLESHOOTING
| Trouble | Symptom | probable cause |
|---|---|---|
| Pitting | Pitting occurs because of uneven rotation of race and bearing surfaces | Excessive bearing preload Excessive load |
| Flaking | The surface peels because of uneven rotation of the race and bearing surfaces | End of bearing life Improper bearing assembly |
| Cracking | Chipping or cracking of cage or roller edges | Impact when bearing was installed (such as being hit with a hammer) |
| Flat spotting | When large load is applied, race and roller contact surfaces compress, forming indentations | Excessive bearing preload Excessive load Vibration when bearings are not used, such as during shipment on freight cars, transport trucks, etc. |
| Nicks | Instead of rolling along race surface, rollers slide, thus damaging surface | Improper grease Excessive bearing preload Excessive load Faulty oil seal |
| Smearing | Damage or wear caused by minute particles adhering to surfaces results in rough movement and such high temperatures that parts of surface melt | Excessive variation of loads on bearings Use of grease other than that specified Improper grease |
| f&St, corrosion i, q!- 3j I$ W | Appears on various areas of the bearing W f f ’d b fii | Use of grease other than that specified Faulty oil seal Presence of water or moisture Imroer rease |
| )ear ,‘J . .2 4 3 ,I | ear o surace areas cause y rcton | pp g Foreign matter Rust or corrosion due to moisture Use of grease other than that specified Faulty oil eal U f h h |
| &coloration | Grease discoloration result:s from grease deterioration which causes particles of pigment contained in grease to adhere to surfaces Heat discoloration will appear as a deep brown or purple | se o grease oter tan that specified Faulty oil seal Excessive bearing preload Excessive load |
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