GMC 4000 Series Service Manual page 145

Sec. 4A
Page 138
REAR AXLE A N D CONTROLS
Figure 21 — A ssem bling Torsion Spring and Levers (Eaton)
winding lever (24) with one end of spring, in clock­
wise direction until end of spring is past shift fork
actuating lever; then push in on assembly until
positioned as shown in figure 17.
8. Dip above assembly in lubricant. With drive
nut on drive screw assembly in center of screw,
1 Compression Nut
2 Screw
3 Valve Cover
4 Cover Gasket
5 Trunnion Screw
6 Valve Body
G M C S E R V I C E M A N U A L
7 Body Gasket
8 Lower Valve Body
9 Tension Spring
10 Operating Lever
11 Trunnion
12 Retaining Washer
Figure 2 2 — Sectional a n d D isasse m b led V ie w s of Control Valve
and fiber contact bumper down toward switch,
position the slots of winding lever over the drive
nut. Install the shaft (21) through center of the
assembly into depression in housing.
9. Install new gasket (25) on housing. Install
cover (26) with spring detent against drive nut.
Retain cover with screws and lock washers (28).
10. Remove oil plug (27). With unit standing
with motor up, lubricate in accordance with in­
structions given in LUBRICATION (SEC. 0). Re­
install plug and tighten firmly.
ASSEMBLY (ROCKWELL)
Key numbers in text refer to figure 18.
1. Install automatic switch assembly (17) into
housing. Use flat head screw (18) to attach switch
to housing. On outside of housing, install two bush­
ings (11), fiber washers (10), and jam nuts (9) over
switch terminal screw s. Tighten nuts firmly.
2. Install motor assembly grommet (7), then
install gasket (5) on housing. Install motor (6) and
cover (4) into housing. Install three screw s and
lock washers (1) and two stop nuts (2). Install
motor cover cable clip (3) under outer screw.
Tighten screw s and nuts firmly.
13 Poppet Lever
14 Pivot Pins
15 Poppet Spring
16 Poppet Stem
17 Poppet (Valve)
T P M -7 5 9 0