GMC 1990 Light Truck Repair Manual page 105

REMOVE
1. Wrap 0.1 mm to 0.2 mm
(.005* to .008*) shim stock
around shaft and insert
between shaft and seal.
Pry seal out.
WORM SHAFT
SHIM STOCK
WORM SHAFT
SEAL
REMOVE
1. Center steering gear.
2. Remove parts as shown.
P R E L O A D A D JU S T E R NUT
(If replacing gasket only, do not remove.)
SID E C O V E R B O LT S
SIDE C O V E R
P R E L O A D
A D JU S T E R
SHIM
P R E L O A D
A D JU S T E R
PITM AN
S H A F T
PITM AN S H A F T
S E A L
1. REMOVE AND INSTALL WORM SHAFT
SEAL GEAR ASSEMBLED
IN S T A L L
1. Install parts a s shown.
S C R E W D R IV E R
HOUSING
NOTICE: Do not turn steering wheel hard
against "stops" when linkage is disconnected.
2. REMOVE AND INSTALL PITMAN SHAFT
AND SIDE COVER
INSTALL
1. Before installing turn
preload adjuster screw
counter-clockwise until
it bottoms, then back
screw off one half turn.
2. Install parts as shown
F E E L E R G A U G E
SID E C O V E R
(Select to get
G A S K E T
proper clearance)
HO U SIN G
PITM AN
S H A F T S E A L
S C R E W D R IV E R
Figure 2—Model 525 — Chart A
MANUAL STEERING 3B2-3
1* S O C K E T
W O R M S H A F T
HOUSING
Install seal.
Checking end clearance
If clearance is greater than .05
lash adjuster kit is available.
P R E L O A D
A D JU S T E R
PITM AN S H A F T
Install seal
LUBRICATION
The steering gear requires .312 kg (11 oz)
of lubricant G M 4673M or equivalent.
S E A L
mm (.002") a steering gear
SHIM
-J
F4647