Detroit Diesel 4000 Series, Service Manual, Page: 364 / 2706

SERIES 4000 12/16V SERVICE MANUAL
C 025.05.08 – INSPECTION AND REPAIR
Perform the following steps for inspection and repair of gear train (gear case end).
1. Clean all components.
2. Using magnetic crack testing method and fluorescent magnetic powder, check idler gears
for cracks.
[a] If cracks are detected, replace idler gear. Refer to section C 025.05.10.
[b] If cracks are not detected, continue inspection.
3. Visually inspect surface condition of idler gear for wear with magnifying glass.
[a] If wear is detected on surface, replace idler gear. Refer to section C 025.05.10.
[b] If no wear is detected on surface of idler gear, continue inspection.
4. Visually inspect running surface of idler gear hub, bushing in idler gears and bearing
surfaces of gears for wear and scores.
[a] If wearing or scoring is detected, replace component if necessary. Refer to section C
025.05.10.
[b] If scoring or wear is not detected, continue inspection
5. Check taper seat and bolt-on surface of idler gear hubs for scoring and wear.
[a] If scored or worn, replace taper seat and idler gear hubs. Refer to section C 025.05.10.
[b] If the taper seat and bolt-on surface of idler gear hubs show no scoring or wear,
continue with inspection.
6. Check bolts for damage and check condition of threads.
[a] Replace bolts if damaged.
[b] If bolts are not damaged, continue with inspection.
All information subject to change without notice.
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