TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 838 of 894
GEARS AND CASE
MAINSHAFT REMOVAL & DISASSEMBLY:
1. Lock auxiliary transmission in two gears by
engaging underdrive clutch collar (B-16) with mainshaft
gear (B-18) and direct and overdrive clutch collar (B-6)
with overdrive gear (B-7).
2. Use 2Y " socket to remove drive gear and
mainshaft companion flange or end yoke nuts (A-5 and
B-28) and flat washers (A-4 and B-27).
3. Use puller or equivalent and remove main drive
gear and mainshaft rear companion flanges or end yokes
(A-2 and B-25).
4. Remove front transmission hanger (if used) from
drive gear bearing cap (F-7).
5. Remove cap screws (F-4), lock washers (F-6)
and separate front bearing cap (F-1) from main drive
gear bearing cap (F-7). Remove bearing cap gasket (F-
3). Remove front bearing cap oil seal (F-2).
6. Remove cap screws (F-9), lock washers (F-10)
from drive gear bearing cap (F-7). Use pull screws on
bearing cap (F-7) to separate cap and bearing (A-7) from
drive gear (A-1).
7. After drive gear bearing cap (F-7) has been
removed, tap bearing (A-7) free of bearing cap by
tapping on outer race of bearing from inside of bearing
cap.
8. Remove retaining cap screws (H-6 and J-3) with
copper washers (H-10 and J-4) from mainshaft and
countershaft rear bearing caps (H-2 and J-1).
Separate
bearing caps from gaskets and case. Check and remove
speedometer bushing (H-3) if it is to be replaced by
removing mounting parts (H-21 through H-25).
9. Remove speedometer drive gear (or spacer if
used) (B-24) and bearing thrust washer (B-23) from rear
of mainshaft.
10. To remove mainshaft rear bearing, slide main
drive gear (A-1) and bearing (A-9) as far forward as
possible. Tap mainshaft (B-1) forward to start rear
bearing off mainshaft and expose retaining lock ring (B-
2) by using tubular driver against splined shoulder to rear
of shaft.
Caution:
Do not drive against threaded section at end
of shaft. Tap shaft forward until mainshaft clutch gear (B-
5) bottoms against drive gear (A-1).
11. Use screw driver lip in groove of retaining ring to
remove from groove of mainshaft, or use two screw
driver ends on the ends of ring. Push on end and allow
ring to fall in bottom of case.
12. Use two pry bars to slide mainshaft and gear
assembly (B-1 through B-22) toward rear of case as far
as possible. This should slide mainshaft rear bearing (B-
22) out of case far enough to use a puller that clamps on
the snap ring of the bearing.
Remove rear bearing (B-
22) and thrust washer (B-21) from mainshaft.
13. Pull mainshaft out through rear bearing bore,
lifting the parts from the mainshaft and out the top
opening of case as they pull free:
A.
Inner race of drive gear pocket bearing (A-
10). This is a two piece bearing. The inner
race will usually stay with the mainshaft,
however, the inner race is a slip fit on the
mainshaft and may come off with the drive
gear.
B.
Direct and overdrive clutch gear and collar
(B-5 and B-6).
C.
Overdrive gear (B-7) with sleeve (B-10),
needle bearings (B-8), and spacer (B-9).
D.
Underdrive gear (B-12) with remaining
caged-or loose needles (B-14), for models
R8031-P and Q. Model R8031-R unit (B-
12A) gear will be located next to back of
case. This gear is a deep reduction gear
2.40:1 ratio.
E.
Shift collar (B-16).
14. Loose or caged needle roller bearings (B-8) are
also used with mainshaft overdrive gear (B-7).
If these
bearings are to be reused then use caution to prevent
loss of needles as gear (B-7) is removed from sleeve (B-
10).
15. Slide drive gear (A-1) rearward and lift out
through top opening of case. Remove inner race of
bearing (A-9) from drive gear.
16. Use soft hammer and tap outer race of drive
gear roller bearing (A-9) out of front bearing bore of case.
17. Remove pocket bearing (A-10) from drive gear
(A-1).
COUNTERSHAFT DISASSEMBLY
1. With pry bar on front face of gear (C-6), force
countershaft assembly rearward to clear front bearing (C-
2) of which the outer race will remain in case bore. Rear
bearing (C-14) will be pushed out of case remaining on
the countershaft.
829
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