NC SW6 - Page 78

78
Fault Finding
CHART E1—Dumper gearbox (continued)
Check Action
24
Is the counter shaft or it bearings worn or damaged? YES: Renew damaged parts.
NO: Check 25
25
Is there excessive backlash in the gears? YES: Adjust by checking shaft end
float.
NO: Check 26
26
Is the main shaft pilot bearing worn? YES: Renew.
NO: Check gear teeth for scuffing.
27
Is the main-shaft rear bearing worn? YES: Renew
NO: Check 28
28
Are the sliding gear teeth worn or damaged? YES: Renew gears
NO: Check 29
29
Are the selector forks loose? YES: Tighten screws
NO: Check 30
30
Are the selector fork pads or grooves in gears worn? YES: Renew worn parts
NO: Check 31
31
Are dog teeth gear worn? YES: Renew
NO: Check 32
32
Are selector rod detent springs broken? YES: Renew
NO: Check 33
33
Are the selector rods worn or broken? YES: Renew
NO: Check 34
34
Are the selector fork pads out of position? YES: Reposition or renew.
(check interlock)
NO: Check 35
35
Is there excessive end float in gears or shafts? YES: Adjust
NO: Check thrust washers and mating
faces.
36
Is the synchroniser bronze worn? YES: Renew synchro pack.
NO: Check 37
37
Are steel chips embedded in the bronze? YES: Continue using, chips will either
embed blow bronze or be
rejected
NO: Check 38
38
Are the synchroniser components damaged? YES: Renew
NO: Check free running gears for
seizure or damage.
39
Are the sliding gears tight on the splines? YES: Free or renew
NO: Check 40