Paccar CARCO 50B, Service Manual

Page: 36 / 61

34
Using a wood block, bump the end of the clutch shaft at
the left hand side of the winch to unseat the brake assem-
bly. Remove the brake assembly. Retain the shim set for
reassembly.
Grasp the brake hub and pull the clutch shaft assembly
out of the winch through the brake opening.
On 4-shaft standard PTO units, the clutch shaft pinion
gear (28) will not clear the first reduction gear on the idler
shaft. One of the following methods may be used to
remove the clutch shaft assembly.
1. Refer to “Idler Shaft Service” and remove the first
reduction gear and second reduction pinion assembly.
or
2. Remove the rotary seal shaft (24) and bearing retainer
(22) from the left hand side of the clutch shaft. With a
gear puller, remove the bearing cone (5) and pinion
gear (28).
To facilitate removal of the clutch shaft assembly, have an
assistant place a 3 ft. (1 m) length of 1 in. (25 mm) I.D.
pipe over end of the rotary seal shaft and lift slightly as
you both move the clutch shaft assembly out through the
brake opening. Move the clutch shaft assembly out of the
winch case far enough to place a lifting sling between the
bevel gears.
Complete clutch shaft removal from winch case and place
shaft assembly on clean work surface.
During disassembly, keep all components in the order in
which they were removed.
Remove the rotary seal shafts (24) and bearing retainers
(22) from each end of the clutch shaft.
With a gear puller, remove the pinion gear (28) and bear-
ing cone (5) from the clutch shaft (if not already removed).
Remove the brake hub (29) and bearing cone (9) from the
clutch shaft.
Remove and discard o-rings (19) and back-up rings (23)
from the clutch shaft.
Slide each clutch assembly off of the shaft. Refer to
“Clutch Assembly Service” for additional information.
Remove the bevel gear thrust bearing assembly (7,13,25)
from the shaft.
Remove the bevel gear and bearing carrier assemblies
(3,31) from the shaft. Inspect bearings (3) and press off
gears if replacement is necessary. Note correct position
of bearing (3) and carrier (31) retaining rings when
installed on the bevel gears. The bearings have been
“staked” into the carrier. If bearing replacement is neces-
sary, use a press to remove and install the bearings. Use
a center punch to “restake” the bearing carriers onto the
bearings.
Remove the bevel gear needle bearings (8) and inner
races (6) from the shaft.
Remove the bevel gear spacers (30) and shim set (33)
from the shaft. Be sure to retain the shims for reassem-
bly.
“Standard PTO Units”
DO NOT use an impact wrench to remove or install the
rotary seal shaft (24). This part has been heat treated
to provide long service life with the rotary seal and may
be damaged by impact or over tightening.
Use hand
wrenches only.
CAUTION