Paccar CARCO 50B, Service Manual

Page: 39 / 61

37
Begin the clutch shaft assembly by first installing the
brake side components. Install the shim pack, Z (previ-
ously determined by the component measurement) onto
the clutch shaft between the bevel gear spacers (30).
Install two inner bearing races (6) onto the brake side of
the clutch shaft.
Install a bevel gear/bearing carrier assembly onto the
clutch shaft, positioning the bevel gear over the needle
bearing races (6). Lubricate and install two needle bear-
ings (8) between the bevel gear and the bearing races.
50B/70A
Lubricate and assemble the thrust bearing (7) between
two thrust bearing races (13) and place over the splined
thrust bearing spacer (25).
Install the thrust bearing assembly (7,13, 25) onto the
clutch shaft while fully seating the assembly against the
bevel gear.
Lubricate and install an o-ring (19) and back-up ring (23)
into the inner groove of the shaft with the back-up ring
placed next to the splined thrust bearing spacer (25).
NOTE: The concave (cupped) side of the back-up
ring (23) must always face the o-ring (19).
Install a clutch assembly onto the shaft aligning the
splines of the clutch friction discs with the splines of the
bevel gear. Seat the clutch over the o-ring and back-up
ring installed on the clutch shaft.
Lubricate and install an o-ring (19) into the outer groove
of the clutch shaft and seat into the clutch housing. Install
the back-up ring (23) next to the o-ring. Install the brake
hub spacer (36) onto the clutch shaft next to the clutch
housing. The spacer should hold the o-ring and back-up
ring into the clutch housing.
Install the brake hub (29) onto the clutch shaft with the
small end against the spacer (36).
Install bearing cone (9) onto the clutch shaft. Press into
position until the bearing cone seats securely against the
shoulder of the shaft.
NOTE: Early rotary seal shafts require a 7/8 inch
deep well socket, while current shafts require a
15/16 inch deep well socket for installation. New
shafts are completely interchangeable with early
ones.
Install rotary seal shaft (24) and retainer (22) onto the
clutch shaft. Install the bearing retainer with the small
diameter (chamfered) side toward the bearing cone.
Apply Loc-tite 271 or equivalent to the threads and pilot
shoulder of the shaft and tighten the early design to 40 lb•
ft (54 N•m) torque. Tighten the current design to 130 lb•ft
(175 N•m) torque.
Complete the assembly of the clutch shaft by installing
the remaining components on the gear side of the shaft.
Lubricate and install two inner bearing races (6) onto the
shaft.
i
Bearing
Cone
Brake
Hub
Clutch
Assembly
Bevel Gear
Assembly
Spacer
Bearing
Race
Needle
Bearing
O-Ring
Back-up
Ring
Retainer
Rotary
Seal
Shaft
i
Spacer
Bevel Gear
Assembly
Clutch
Assembly
Spacer
Pinion, First
Reduction
Bearing
Cone
Rotary
Seal
Shaft
Retainer
Back-up
Ring
O-Ring
Needle
Bearing
Bearing
Race
ITEM DESCRIPTION QTY.
7 Thrust Bearing 2
13 Thrust Bearing Race 4
25 Thrust Bearing Spacer 2