Page 1385 of 2198
(5) Pull No. 4 shift rail outward and remove lock
balls and pin (Fig. 11).
(6) Remove No. 4 shift rail, fifth gear and No. 3
shift fork (Fig. 12).
(7) Pull No. 5 shift rail and shift head out of plate
(Fig. 13).
(8) Remove shift rail No.3.Catch interlock pins
as rail is removed (Fig. 14).
(9) Remove No. 1 shift rail and interlock pin (Fig. 15).
Fig. 11 Removing No. 4 Shift Rail, Lock Balls And
Pin
Fig. 12 Removing No. 4 Shift Rail And Fifth Gear
Shift Fork
Fig. 13 Removing No. 5 Shift Rail And Shift Head
Fig. 14 Removing No. 3 Shift Rail And Interlock Pin
Fig. 15 Removing No. 1 Shift Rail And Interlock Pin
21 - 8 AX 4/5 MANUAL TRANSMISSIONJ
Page 1386 of 2198
(10) Remove shift rail No. 2 and shift forks 1 and 2
(Fig. 16).
(11) Remove reverse idler gear and shaft (Fig. 17).(12) Remove reverse shift arm and fork (Fig. 18).
MAINSHAFT DISASSEMBLY
(1) On AX 5, measure fifth counter gear thrust
clearance with feeler gauge (Fig. 19). Clearance
should be 0.10-0.30 mm (0.004-0.012 in.).
Fig. 16 Removing Shift Forks And No. 2 Shift Rail
Fig. 17 Removing Reverse Idler Gear And Shaft
Fig. 18 Reverse Shift Arm Removal
Fig. 19 Measuring Counter Fifth Gear Thrust
Clearance
JAX 4/5 MANUAL TRANSMISSION 21 - 9
Page 1387 of 2198
(2) Engage two synchro sleeves to lock mainshaft
gears (Fig. 20).
(3) On AX 4, remove counter gear nut and oil
slinger. On AX 5, remove select fit snap ring that se-
cures fifth spline gear and counter fifth gear on shaft
(Fig. 21).(4) Remove fifth spline gear, synchronizer and
counter fifth gear with 2-, or 3-jaw puller (Fig. 22).
(5) Remove spacer and remove lock ball with pencil
magnet (Fig. 23).
Fig. 20 Locking Mainshaft Gears
Fig. 21 Removing Fifth Gear Snap Ring
Fig. 22 Removing Fifth Gear Assembly
Fig. 23 Spacer And Lock Ball Removal
21 - 10 AX 4/5 MANUAL TRANSMISSIONJ
Page 1388 of 2198
(6) Remove reverse shift arm bracket (Fig. 24).
(7) Remove rear bearing retainer bolts with appro-
priate size torx bit and remove retainer (Fig. 25).(8) Remove rear bearing snap ring (Fig. 26).
(9) Tap intermediate plate with plastic mallet and
pull output shaft-counter gear assemblies out of plate
(Fig. 27).
(10) Remove rear bearing from intermediate plate.
(11) Remove input shaft and shaft roller bearings
from output shaft.
Fig. 24 Removing Reverse Shift Arm Bracket
Fig. 25 Removing Rear Bearing Retainer
Fig. 26 Removing Rear Bearing Snap Ring
Fig. 27 Removing Counter Gear And Output Shaft
JAX 4/5 MANUAL TRANSMISSION 21 - 11
Page 1389 of 2198
(12) Measure thrust clearance of output shaft
gears (Fig. 28). Clearance should be 0.10 - 0.25 mm
(0.004 - 0.010 in.).
(13) Remove output shaft fifth gear snap ring with
two screwdrivers (Fig. 29).(14) Press fifth gear, rear bearing, first gear and
inner race off output shaft (Fig. 30).
(15) Remove needle roller bearing.
(16) Remove synchronizer ring.
(17) Remove synchronizer lock ball with pencil
magnet (Fig. 31).
Fig. 28 Checking Output Shaft Gear Thrust
Clearance
Fig. 29 Removing Fifth Gear Snap Ring
Fig. 30 Removing Fifth Gear And First Gear Bearing
And Race
Fig. 31 Synchronizer Lock Ball Removal
21 - 12 AX 4/5 MANUAL TRANSMISSIONJ
Page 1390 of 2198

(18) Press 1-2 synchronizer and second gear off
output shaft (Fig. 32).
(19) Remove needle roller bearing from the shaft
or second gear.
(20) Remove 3-4 synchronizer snap ring (Fig. 33).
(21) Press 3-4 synchronizer and third gear off shaft
(Fig. 34).
(22) Remove needle roller bearing from shaft or
gear.
CLEANING AND INSPECTION
Clean the transmission components in solvent. Dry
the cases, gears, shift mechanism and shafts with
compressed air.Dry the bearings with clean, dry
shop towels only. Never use compressed air on
the bearings. This could cause severe damage
to the bearing roller and race surfaces.
Inspect the transmission case. Replace the case if
cracked, porous, or if any of the bearing and gear
bores are damaged.
Check thickness of the output shaft and inner bearing
race flanges with a micrometer or vernier calipers (Fig. 35).
²Minimum thickness for shaft flange is 4.8 mm
(0.189 in.)
²Minimum thickness for bearing race flange is 3.99
mm (0.157 in.)
Measure diameter of the output shaft journal sur-
faces with a micrometer (Fig. 36). Replace the shaft
if either of these surfaces are worn beyond specified
limits.
²Second gear surface minimum diameter is 37.96
mm (1.495 in.)
²Third gear surface minimum diameter is 34.98
mm (1.377 in.)
Measure output shaft runout with a dial indicator
(Fig. 37). Runout should not exceed 0.05 mm (0.002
in.).
Install the needle bearing and inner race in the
first gear. Then check oil clearance between the gear
and inner race (Fig. 38). Clearance should be 0.009 -
0.032 mm (0.0004 - 0.0013 in.).
Fig. 32 Second Gear And 1-2 Synchronizer Removal
Fig. 33 Removing 3-4 Synchronizer Snap Ring
Fig. 34 Removing 3-4 Synchronizer And Third Gear
JAX 4/5 MANUAL TRANSMISSION 21 - 13
Page 1391 of 2198
Fig. 35 Checking Shaft And Bearing Race Flange
Thickness
Fig. 36 Checking Shaft And Race Diameters
Fig. 37 Checking Output Shaft Runout
Fig. 38 Checking Gear-To-Race Clearance
21 - 14 AX 4/5 MANUAL TRANSMISSIONJ
Page 1392 of 2198
Install the needle bearings and the second, third
and counter fifth gears on the output shaft. Then
check oil clearance between the gears and shaft with
a dial indicator (Fig. 39). Oil clearance for all three
gears is 0.009 - 0.0013 mm (0.0004 - 0.0013 in.).
Check synchronizer ring wear (Fig. 40). Insert each
ring in matching gear. Measure clearance between
each ring and gear with feeler gauge. Replace ring if
clearance exceeds 2.0 mm (0.078 in.).Check shift fork-to-synchronizer hub clearance with
a feeler gauge (Fig. 41). Replace the fork if clearance
exceeds 1.0 mm (0.039 in.).
Fig. 39 Checking Gear-To-Shaft Oil Clearance
Fig. 40 Checking Synchronizer Ring Wear
Fig. 41 Checking Fork-To-Hub Clearance
JAX 4/5 MANUAL TRANSMISSION 21 - 15