Paccar CARCO 50B, Service Manual

Page: 31 / 61

BEVEL PINION AND HYDRAULIC PUMP SERVICE
The bevel pinion, bevel gears and hydraulic pump are
turning whenever the tractor PTO shaft is turning. The
bevel pinion transmits torque from the PTO shaft to the
bevel gears, clutch shaft and winch gear train. Proper
adjustment of bevel pinion/bevel gear back-lash and
tooth contact pattern is essential for quiet operation and
long component life.
The bevel pinion and hydraulic pump share common car-
rier housing. The carrier is mounted in the front face of
the winch case and will be located in the upper bore for
standard PTO winches and in the lower case bore of low
PTO winches.
BEVEL PINION CARRIER REMOVAL
Drain oil from winch and remove the winch from the trac-
tor as described in “Winch Removal and Installation” sec-
tion of this manual. Leave the winch mounting adapter
plates attached to the tractor where applicable.
Remove the ½ in. capscrews which secure the bevel gear
inspection plate to the top of the winch case. Remove the
inspection plate. Remove the pump suction tube and
pressure hoses from the pump. Remove the capscrews
(3) securing the carrier assembly to the winch case.
Using two of the capscrews as “jackscrews”, remove the
carrier assembly. Retain the shim set (13, 14, 15) for
reassembly.
BEVEL PINION REMOVAL
Bend the tang of the lockwasher (4) away from the lock-
nut (2) and remove the locknut (2) and lockwasher (4).
Support the carrier assembly in a suitable press. Place
support blocks toward the outer diameter of the carrier.
From the locknut end, press out the bevel pinion (16).
Remove the bearing cone set spacer from the bevel pin-
ion. Position the bevel pinion assembly in a suitable press
with support blocks under the pump drive pinion (10) as
close to the bevel pinion gear as possible. Press the
bevel pinion (16) free of the bearing cone and pump drive
pinion.
Support the carrier in a vice and remove the oil seal (8),
oil seal spacer (9) and o-ring (5).
Remove the oil seal retaining ring (7) and outer bearing
cone. Remove the bearing cups, bearing cup retaining
ring and the set spacer from the carrier.
Remove the retaining ring (19) and plug (20) from the end
of the bevel pinion. Remove the o-ring (18) from the
groove in the gear.
Thoroughly clean and inspect all parts at this time. All
components of the bearing assembly are a matched set
with the bearing adjustment controlled by the inner and
outer set spacers. If the bearing cone or cup is worn or
damaged, the entire bearing assembly (1) must be
replaced.
BEVEL PINION ASSEMBLY
Lubricate and install o-ring (18) into the groove in the bore
of the bevel pinion (16). Install plug (20) with chamfered
edge toward the o-ring. Secure the plug in the pinion with
the retaining ring (19).
NOTE: On bevel pinions equipped with a threaded
plug, apply Loc-tite 242 or equivalent to socket head
plug and tighten securely.
Clean and dry bore of pump drive pinion (10) and mating
surface on bevel pinion (16) with Loc-tite primer or equiv-
alent.
Apply Loc-tite 601 or equivalent to pump drive pinion bore
and mating bevel pinion surface. Press pump drive pinion
onto bevel pinion and seat securely against bevel pinion
shoulder. Allow Loc-tite to harden.
Press one bearing cone of the bearing assembly (1) on to
ITEM DESCRIPTION QTY.
1 Bearing Assembly 1
2 Bearing Locknut 1
3 Capscrew, Hex Head 6
4 Lockwasher 1
5 O-Ring 1
6 Dowel Pin 1
7 Retaining Ring 1
8 Oil Seal 1
9 Seal Spacer 1
10 Pump Drive Pinion 1
11 Shim Gasket 1
12 Carrier 1
13, 14, 15 Shims 2-A.R.
16 Bevel Pinion 1
17 Bevel Gear 2
18 O-Ring 1
19 Retaining Ring 1
20 Plug, Bevel Pinion 1
i
29