NC SW6 Maintenance Instructions Manual page 78

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