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Crane release bearing burning phenomenon:
For example, in Dongfeng agricultural vehicles, it is difficult to start the engine when the pedal is depressed. The crankshaft is rotated by operating the crank and it feels very heavy. Only when the pedal is in neutral can the engine be started smoothly. When the engine is idling, just press the lower pedal and the mainboard will turn off immediately.
Stop and turn off the engine for inspection, step on the pedal, and turn the driven plate. The driven plate can rotate freely and other parts are not damaged. I turned the crane release bearing and found that the release bearing could not be pulled out. After inspection, it was found that the release bearing was ablated due to poor lubrication, and its inner and outer rings, retainers and other components were severely ablated and locked. Not only could the bearing not rotate during operation, but it also produced greater friction with the clutch release lever and Abnormal noise occurs, causing the engine to have difficulty starting.
Common causes of release bearing damage include:
1. Although the release bearing has been filled with grease when it leaves the factory, after long-term use, especially after encountering high temperatures, the grease melts and is gradually shed during the operation of the bearing. The bearing generates heat due to dry friction, resulting in Ablation, stuck, and loss of separation effect.
2. Some drivers are accustomed to using a half-foot clutch, which makes the clutch in a half-engaged and half-separated state, causing dry friction in the clutch and transferring heat to the release bearing, causing the grease in the bearing to become thinner and lost. When the temperature reaches a certain value, the bearing Ablative damage.
3. During vehicle maintenance, the small oil bottom is omitted or lost, causing mud to invade the release bearing and causing bearing wear.
4. The free stroke of the clutch pedal is too small or absent, causing it to be in a state of constant engagement, causing fatigue damage or even ablation; the pedal stroke is too large, causing incomplete clutch separation and difficulty in shifting gears, and the clutch is in a half-engaged and half-separated state, resulting in Due to dry friction, heat is transferred to the release bearing, causing the grease to run out and the bearing to ablate.
5. After the release bearing is eroded by dust, the grease will deteriorate, aggravating its damage.
6. The release bearing and the release sleeve have poor fit, especially the fit gap between the two is too large, loose, and not in the same plane. The release bearing is subject to impact loads during operation, causing wear and ablation of the track.
The release bearing should rotate flexibly without abnormal noise (the inspection method is shown in Figure 1, the axial clearance is m.0.6mm), and the wear of the inner race should not exceed 0.3mm, otherwise it should be replaced with a new one. . The matching clearance between the pedal shaft, separation fork and bushing is too large. Generally, the bushing should be replaced and cut to fit. When cutting the two bushings on the bracket, a long-edged knife or a knife with a guide device must be used to ensure their coaxiality.
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