Page 1689 of 2585
(7) Install cupholder plugs (Fig. 202).
(8) Install gearshift boot to console (Fig. 203).
Secure with three (3) retainer clips.(9) Install gearshift knob to gearshift lever (Fig.
204). Orient shift pattern1¤4-turn clockwise, push
down and rotate1¤4-turn counter-clockwise and
release. Secure boot to knob.
(10) Connect battery negative cable.
Fig. 202 Cup Holder Plugs
1 - CUPHOLDER PLUG (2)
Fig. 203 Gearshift Boot Removal/Installation
1 - GEARSHIFT BOOT
2 - CENTER CONSOLE
Fig. 204 Gearshift Knob Removal/Installation
1 - GEARSHIFT KNOB
2 - GEARSHIFT LEVER
21 - 92 T850 MANUAL TRANSAXLERS
GEARSHIFT MECHANISM (Continued)
Page 1690 of 2585

INPUT SHAFT
DESCRIPTION
The input shaft assembly (Fig. 205) is part of the
transaxle geartrain, is driven by the clutch assembly,
and consists of the following components:
²Input Mainshaft
²3rd Speed Gear
²4th Speed Gear
²3/4 Synchronizer
²5th Input Gear
The input shaft meshes with the intermediate
shaft, and is supported by a needle bearing at the
front of the transaxle, and a sealed roller bearing at
the rear of the transaxle.DISASSEMBLY
NOTE: When servicing the input shaft assembly, all
snap rings which are removed MUST be replaced
with new snap rings upon reassembly. The 5th gear
nut must be replaced also.
NOTE: Depending on the date of transaxle manufac-
ture, some input shafts will utilize a needle bearing
under the 3rd and 4th Speed Gears.
(1) Invert input shaft assembly and place in fix-
ture 8487.
(2) Remove input bearing snap ring (Fig. 206).
Fig. 205 Input Shaft Assembly
1 - INPUT SHAFT 6 - 5TH GEAR NUT
2 - THRUST WASHER 7 - SNAP RING
3 - 3RD GEAR 8 - INPUT BEARING (SEALED)
4 - 4TH GEAR 9 - SNAP RING
5 - 5TH GEAR 10 - 3/4 SYNCHRONIZER
RST850 MANUAL TRANSAXLE21-93
Page 1691 of 2585

(3) Remove input bearing. Place input shaft
assembly onto arbor press table, with the input bear-
ing supported by bearing splitter (Fig. 207). Using
adapter 8486-4, press bearing off of shaft, while
helper supports shaft to prevent dropping.
(4) Place input shaft assembly back into fixture
8487. Secure fixture to bench with fasteners, or
secure to bench vise.NOTE: 5th gear nut is staked to the shaft. If neces-
sary, grind stake area to ease removal, but use care
not to contact gear.
(5) Remove 5th gear nut with wrench 8478 (Fig.
208). Discard nut and use a new one upon assembly.
(6) Remove 5th gear with arbor press and bearing
splitter.
(7) Remove 4th gear and needle bearing (if
equipped) (Fig. 209).
Fig. 206 Input Bearing Snap Ring Removal
1 - SNAP RING
2 - INPUT BEARING
Fig. 207 Input Bearing Removal
1 - ARBOR PRESS RAM
2 - ADAPTER 8486-4
3 - INPUT BEARING
4 - BEARING SPLITTER
Fig. 208 5th Gear Nut Removal/Installation
1 - WRENCH 8478
2 - 5TH GEAR NUT
Fig. 209 4th Gear Removal/Installation
1 - 4th GEAR
21 - 94 T850 MANUAL TRANSAXLERS
INPUT SHAFT (Continued)
Page 1692 of 2585
(8) Remove 4th gear blocker ring (Fig. 210).
(9) Remove 3/4 synchronizer snap ring (Fig. 211).
Discard and replace with new snap ring upon assem-
bly.(10) Remove 3/4 synchronizer (Fig. 212).
(11) Remove 3rd gear blocker ring (Fig. 213).
(12) Remove 3rd gear and needle bearing (if
equipped) (Fig. 214).
(13) Inspect third gear thrust washer for signs of
excessive wear. To replace, drive off of input shaft
with suitable drift and hammer.
Fig. 210 4th Gear Blocker Ring
1 - 4th GEAR BLOCKER RING
Fig. 211 3/4 Synchro Snap Ring
1 - SNAP RING
2 - 3/4 SYNCHRONIZER
Fig. 212 3/4 Synchro Assembly
1 - 3/4 SYNCHRONIZER
Fig. 213 3rd Gear Blocker Ring
1 - 3RD GEAR BLOCKER RING
RST850 MANUAL TRANSAXLE21-95
INPUT SHAFT (Continued)
Page 1693 of 2585
ASSEMBLY
NOTE: Depending on date of manufacture, some
input shafts will utilize a needle bearing under the
3rd and 4th Speed Gears.
NOTE: When servicing the input shaft assembly, all
snap rings MUST be replaced with new ones upon
assembly. 5th gear nut must also be replaced.
NOTE: When installing 3/4 synchronizer hub to
shaft, make sure to align oil slots on synchronizer
hub face with oil hole in the shaft splined hub jour-
nal.
NOTE: Refer to (Fig. 215) for input shaft assembly
reference.
Fig. 215 Input Shaft Assembly
1 - INPUT SHAFT 6 - 5TH GEAR NUT
2 - THRUST WASHER 7 - SNAP RING
3 - 3RD GEAR 8 - INPUT BEARING (SEALED)
4 - 4TH GEAR 9 - SNAP RING
5 - 5TH GEAR 10 - 3/4 SYNCHRONIZER
Fig. 214 3rd Gear Removal/Installation
1 - 3RD GEAR
21 - 96 T850 MANUAL TRANSAXLERS
INPUT SHAFT (Continued)
Page 1694 of 2585
(1) Install input shaft into fixture 8487.
(2) Install thrust washer if removed upon disas-
sembly.
(3) Install 3rd gear and needle bearing (if
equipped) (Fig. 216).
(4) Install 3rd gear blocker ring (Fig. 217).(5) Install 3/4 synchronizer (Fig. 218).When
installing 3/4 synchronizer hub to shaft, make
sure to align oil slots on synchronizer hub face
with oil hole in the shaft splined hub journal.
(6) InstallNEW3/4 synchronizer snap ring (Fig.
219).
Fig. 216 3rd Gear Removal/Installation
1 - 3RD GEAR
Fig. 217 3rd Gear Blocker Ring
1 - 3RD GEAR BLOCKER RING
Fig. 218 3/4 Synchro Assembly
1 - 3/4 SYNCHRONIZER
Fig. 219 3/4 Synchro Snap Ring
1 - SNAP RING
2 - 3/4 SYNCHRONIZER
RST850 MANUAL TRANSAXLE21-97
INPUT SHAFT (Continued)
Page 1695 of 2585
(7) Install 4th gear blocker ring (Fig. 220).
(8) Install 4th gear and needle bearing (if
equipped) (Fig. 221).
(9) Install 5th gear and press into position using
installer 8481 (Fig. 222).(10) InstallNEW5th gear nut and torque to 262
N´m (193 ft. lbs.) using wrench 8478 (Fig. 223).
Fig. 220 4th Gear Blocker Ring
1 - 4th GEAR BLOCKER RING
Fig. 221 4th Gear Removal/Installation
1 - 4th GEAR
Fig. 222 5th Gear Installation
1 - ARBOR PRESS RAM
2 - INSTALLER 8481
3 - 5TH GEAR
Fig. 223 5th Gear Nut Removal/Installation
1 - WRENCH 8478
2 - 5TH GEAR NUT
21 - 98 T850 MANUAL TRANSAXLERS
INPUT SHAFT (Continued)
Page 1696 of 2585
(11) Stake 5th Gear nut in four (4) places as fol-
lows:
(a) Install staking tool 8479 to 5th gear nut.
(b) Tighten upper thumb screw by hand (Fig.
224).
(c) Tighten two (2) side thumb screws by hand.
(d) Tighten both staking screws until they bot-
tom on tool body (Fig. 225).
(e) Loosen staking screws and thumb screws.
Remove tool and visually inspect stake (Fig. 226).
(f) Remove tool, rotate 90É, and repeat process to
stake in four (4) places.
NOTE: The input shaft sealed roller bearing and
snap ring do not get installed until transaxle assem-
bly to facilitate installation of the reverse idler gear
mechanism.
Fig. 224 Staking Tool Set-Up
1 - STAKING TOOL 8479
2 - THUMB SCREWS (3)
Fig. 225 Tighten Stake Screws
1 - STAKING TOOL 8479
Fig. 226 5th Gear Nut Stake (Four Places)
1-STAKE
RST850 MANUAL TRANSAXLE21-99
INPUT SHAFT (Continued)