First, the brush-collector assembly is inspected. In this case, the height of the brushes and the force of their pressing against the collector by springs are measured. If the height of the brush is less than 8 mm or its mechanical damage is detected, the brush is changed. The brushes should move freely, without jamming, in the brush holders. The direction of the force of the brush springs must coincide with the axis of the brush holder. The force of the spring is checked with a dynamometer. A paper strip is laid between the brush and the collector and the spring is pulled with a dynamometer in the direction of the brush holder axis. The dynamometer reading at the moment when the strip of paper can be pulled out with a slight effort. should be within 1350-2550 gs. If a weakened spring is found, do not replace it.
The surface of the collector must be clean. smooth and without significant scorching. If there is contamination on the collector and slight burning, it is wiped with a rag soaked in gasoline. A heavily burnt collector is cleaned with a sandpaper. Abrasive particles after stripping are removed by blowing the collector with air. If the burning is not eliminated in this way or there is a strong wear of the collector. it is machined on a lathe. The traction relay is checked for a response voltage of 8.0 V.
The starter drive must freely, without jamming, move along the shaft and return to its original position by a return spring. When the drive is difficult to move, the armature shaft is cleaned of dirt and lubricated with oil used for the engine.
The axial play of the armature shaft should be within 0.3±0.15 mm. The radial play of the shaft in the bearings should be almost imperceptible. With a significant radial play of the shaft, the worn bushings in the starter covers are replaced. New bushings are soaked in engine oil before installation (SAE 30/40). The armature and stator are inspected for breaks and signs of burning.
Pic. 8-6. Gear starter parts:
1 - bushing of the front cover;
2 - front cover;
3 - drive gear;
4 - overrunning clutch;
5 - reducer;
6 - anchor;
7 - housing with stator poles;
8 - brush holder;
9 - back cover;
10 - drive lever;
11 - traction relay.
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