Paccar CARCO 50B, Service Manual

Page: 52 / 61

50
FOURTH SHAFT GROUP
Fourth Shaft
Low PTO, 4 Shaft
Winch Shown
ITEM DESCRIPTION QTY.
1 Roller Bearing 2
2 Thrust Washer - 0.062 in. (1.58 mm) 2
3 Cluster Gear 1
4 O-Ring 1
5 Spacer 1
6 Countershaft Pin 1
7 Thrust Washer - 0.217 in. (5.5 mm) 1
Model 70A winches are equipped with the “Fourth Shaft
Group”. This group contains a cluster gear which pro-
vides additional reduction in the gear train. Most 50B
winches are of the 3-shaft configuration.
DISASSEMBLY
Drain oil from winch as described in the “Preventive
Maintenance” section of this manual.
Remove the six capscrews then remove the left-hand
clutch shaft bearing carrier. Retain the shim set for
reassembly.
Remove the first reduction drum drive gear, second
reduction gear and pinion, freespool shift rail and yoke, if
equipped with freespool. Refer to “Idler Shaft Group” sec-
tion of this manual for additional information.
Install a long, ½ in. NC, capscrew into the end of the
countershaft pin (6) to serve as a handle. Support the
cluster gear (3) and remove the countershaft pin.
Thoroughly clean all parts and inspect for damage and
wear. The bearing rollers should not exhibit any irregular-
ities. If the rollers show any sign of spalling, corrosion,
discoloration, material displacement or abnormal wear,
the bearing should be replaced. Likewise, the cage
should be inspected for unusual wear or deformation,
particularly the cage bars. If there is any damage that will
impair the cage’s ability to separate, retain and guide the
rollers properly, the bearing should be replaced. The
thrust washer contact areas should be free from any sur-
face irregularities that may cause abrasions or friction.
The gears and shaft should be inspected for abnormal
wear or pitting. Replace if necessary.
The inner and outer thrust washers (2 & 7) will drop
down into the winch case when the fourth shaft is
removed. Be sure to retrieve them prior to assembly.
Gear train damage will occur if these thrust washers are
omitted or left in the bottom of the winch case.
CAUTION