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