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 840 of 894
GEARS AND CASE
2. Remove outer race of rear bearing (C-14).
3. Lift countershaft assembly out top of case.
4. Remove front bearing outer race (C-2) by
tapping out with soft hammer from inside of case.
5. Remove snap ring (C-3) from shaft. Using an
Arbor Press, press countershaft out of gears (one at a
time) by supporting each gear with parallel bars as close
to hub of gear as possible. In succession, remove drive
gear (C-6) and overdrive gear (C-8), under drive gear (C-
12).
6. Remove three exposed Woodruff keys (C-7, C-9
and C-13) for models R8031-P and Q keys (C-7) and (C-
9) for model R8031-R. NOTE : On model R8031-R a
snap ring (C-3) secures gear (C-8) to shaft.
COUNTERSHAFT REASSEMBLY IMPORTANT
All countershaft gears should fit tight on the
countershaft. An interference fit of .0015" to .003" is built
into new parts; it presents a field assembly problem.
If heat is used to expand countershaft gear bores,
boiling water, hot oil or steam are usually satisfactory.
DO NOT EXCEED 250" F. Do not use hot plates or
acetylene torches or any method that will turn the steel
blue or straw color and damage the heat treated gears.
If heat is not used, it is advisable to coat the gear
bores with white lead to reduce galling or seizing of parts.
NOTE
When in doubt about which end of the
gear hub to assemble on the shaft first,
look for the chamfered end of the bore in
gear. This end assembles first.
If Woodruff keys or keyways were mutilated or
burred during disassembly, clean up with a file before
reassembling. This will help prevent metal chips from
getting between gear hub faces.
1.
For models R8031-P and Q assemble
Woodruff key (C-13) to countershaft (C-1). Seat key
securely and redress with file if necessary.
2.
In a suitable Arbor press, support
underdrive gear (C-12) on hub, with long hub and
chamfer up.
Place countershaft (C-1) into position, align
key with keyway and press into gear until shoulder on
countershaft seats firmly against gear.
3. Assemble Woodruff keys (C-7 and C-9) to
countershaft (C-1). Seat keys securely and redress with
file if necessary.
4. Again, in arbor press, support under hub of
overdrive gear (C-8) with long hub down and chamfer up,
place countershaft into position, align key with keyway
and press into gear until seated against gear (C-12).
5. In a similar manner, support countershaft drive
gear (C-6), with long hub and chamfer up.
Press
countershaft sub-assembly into gear until seated against
overdrive gear (C-8). Secure with snap ring (C-3).
NOTE
Separable bearings will be found as the front and
rear countershaft bearing (C-14) and (C-2).
When separable bearings are used, press on the
inner race with flange seated against shoulder of
countershaft. Outer race snap ring, must face
toward gears when installed. To prevent auxiliary
countershaft bearing preload at assembly, front
and rear bearing outer rings must protrude .020
outside of case bore, before bearing caps are
assembled and secured.
INSTALLATION OF COUNTERSHAFT
1. Lower countershaft sub-assembly into case with
rear end of shaft and hub of underdrive gear (C-12) out
rear bearing bore. Lower front of countershaft into its
position to front bearing outer race bore. Assemble outer
race of rear bearing (C-14) and (C-2).
2. Use light coat of gasket cement and assemble
countershaft front and rear bearing cap gaskets (J-2) (F-
21) to bearing caps (J-i) (F-20). Apply gasket cement to
case side of gaskets and apply to case front and rear
bearing caps.
3. Dip retaining cap screws (J-3) (F-22) in sealer
and assemble to case with lock washers (J-4) (F-23).
Torque cap screws to 25 32 lbs. ft.
831
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