﻿GET_GEVOMechL2_09_01_01_50 - ANIMATION Screen
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Brush Holder/Collector Ring Cover Inspection

2
00:00:03,208 --> 00:00:06,750
Inspect for damage and missing mounting hardware.

3
00:00:06,750 --> 00:00:10,292
Repair or replace the cover, as necessary.

4
00:00:10,292 --> 00:00:15,375
Inspect the field cables for broken or overheated insulation and wires.

5
00:00:15,375 --> 00:00:18,250
Inspect for loose hardware and terminals.

6
00:00:18,250 --> 00:00:20,250
Replace as necessary.

7
00:00:20,250 --> 00:00:27,167
Inspect the field cable terminal insulators for loose hardware, burning, cracking, or other damage.

8
00:00:27,167 --> 00:00:29,125
Replace as necessary.

9
00:00:29,125 --> 00:00:31,208
Collector Ring Inspection

10
00:00:31,208 --> 00:00:38,917
Check each collector ring for looseness on the insulation and the associated stud rings for shorted studs or damaged insulation.

11
00:00:38,917 --> 00:00:43,042
Replace the collector ring hub assembly if defects are noticed.

12
00:00:43,042 --> 00:00:49,708
Look for yellow or white dust around the base of the ring and a measurable gap between the ring base and the insulation.

13
00:00:49,708 --> 00:00:58,458
A gap between the collector ring bore and the insulation will cause movement of the collector ring on the insulation when pressure is applied by hand on the collector ring.

14
00:00:58,458 --> 00:01:02,458
Replace the collector ring assembly if the collector ring is loose.

15
00:01:02,458 --> 00:01:11,792
Look for ribbons of Teflon® at the location where the studs pass through the rings and for indications of arcing or other damage to the rings or studs.

16
00:01:11,792 --> 00:01:17,375
Ribbons of Teflon® are an early sign of fretting between the stud insulation and the rings.

17
00:01:17,375 --> 00:01:21,583
Replace the collector ring assembly if signs of fretting are noticed.

18
00:01:21,583 --> 00:01:25,458
Check the depth of the spiral grooves machined in the rings.

19
00:01:25,458 --> 00:01:35,708
When the alternator is new, the grooves are 0.140-0.180 inches (3.6-4.6 mm) deep.

20
00:01:35,708 --> 00:01:44,667
If they measure less than 0.020 inches (0.5 mm) deep, replace the collector ring hub assembly.

21
00:01:44,667 --> 00:01:48,125
Inspect the condition of the collector ring surfaces.

22
00:01:48,125 --> 00:01:56,583
Check for evidence of discoloration, etching, grooving, threading, or other signs of distress that require repair or replacement.

23
00:01:56,583 --> 00:01:58,750
Collector Ring Resurfacing

24
00:01:58,750 --> 00:02:07,250
1. With the engine shut off, gain access to the brush and collector ring area by removing the top cover from the brush holder/collector ring cover.

25
00:02:07,250 --> 00:02:09,958
2. Remove the stone from the packaging.

26
00:02:09,958 --> 00:02:15,667
The stone should be of medium coarseness (Grainger Item Number 3GD69).

27
00:02:15,667 --> 00:02:20,917
3. Cut off a one-inch long section of the stoning material using a hacksaw and a vise.

28
00:02:20,917 --> 00:02:25,542
4. Lift up the brush assembly on the collector ring that needs resurfacing.

29
00:02:25,542 --> 00:02:29,792
Set the brush off to the side without disconnecting the wires.

30
00:02:29,792 --> 00:02:40,417
5. Set the cut piece of stone down inside the brush holder, place the brush back on top of the piece of stone, and reposition the tensioning clip on top of the brush assembly.

31
00:02:40,417 --> 00:02:46,417
6. Start the engine and run it at idle speed, then allow the stone to resurface the collector ring.

32
00:02:46,417 --> 00:02:50,125
7. Shut down the engine and re-inspect the collector rings.

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00:02:50,125 --> 00:02:56,542
8. When the resurfacing is complete, clean up the collector ring and the surrounding area with compressed air.
