GMC 1976 ZEO 6083 Maintenance Manual page 553

7 . Move pump until belts are tight, then tighten
adjusting screws . Do not pry on reservoir or pull on
filler neck .
8 . Adjust belts. (Refer to ADJUSTMENTS) .
9 . Bleed system . (Refer to FLUID LEVEL under
ADJUSTMENTS) .
SERVICING OF THE FLOW
CONTROL VALVE
(WITHOUT REMOVING PUMP
ASSEMBLY FROM VEHICLE)
REMOVAL
1 . Disconnect high pressure hose from pump un-
ion and drain oil.
2. Remove union and withdraw flow control
valve and spring with a magnet .
INSPECTION
1 . Flow control valve must slide freely in housing
bore . If sticking occurs, check for dirt or burrs.
2. Check cap screw in the end of valve for loose-
ness ; if loose, tighten, being careful not to damage
machined surfaces .
3 . If the flow control plunger is suspected of be-
ing faulty, install new valve. This is serviced as a unit
and is factory calibrated .
INSTALLATION
To install, reverse the "Removal" procedure and
install a new "O" ring seal on the union .
ADJUSTMENTS
FLUID LEVEL
1 . Run engine until Power Steering Fluid reaches
normal operating temperature, approximately
170°F., then shut engine off. Remove reservoir filler
cap and check oil level on dipstick .
2. If oil level is low, add Power Steering Fluid to
proper level on dipstick and replace filler cap.
NOTE :
When adding or making a complete fluid
change, always use special power steering fluid
available from servicing parts warehouses .
BELT ADJUSTMENT
ADJUSTING BELT TENSION
STEERING 9- 2 1
3. When checking fluid level after the steering
system has been serviced, air must be bled from the
system . Proceed as follows:
a. With wheels turned all the way to the left,
add power steering fluid to "Cold" mark on dipstick .
b . Start engine, run at fast idle, and recheck
fluid level. Add fluid if necessary to "Cold" mark on
dipstick .
c. Bleed system by turning wheels from side
to side without hitting stops. Maintain fluid level just
above internal pump casting. Fluid with air in it will
have a cloudy appearance . This air must be elimi-
nated from fluid before normal steering action can be
obtained .
d. Return wheels to center position and con-
tinue to run engine for two or three minutes then
shut engine off.
e. Road test car to make sure steering func-
tions normally and is free from noise.
f . Recheck fluid level as described in steps 1
and 2, making sure fluid level is between "Cold" and
"Hot" marks on dipstick after the system has stabil-
ized at its normal operating temperature.
When adjusting a power steering pump belt,
never pry against the pump reservoir or pull against
the filler neck . To increase belt tension move the
pump outward by prying against the bracket pry lugs
or against the pump housing casting extension di-
rectly behind the pump drive pulley .
A belt that has been previously tensioned is con-
sidered to be a used belt and should be tightened to
70 to 80 pounds . A belt that has never been tensioned
is considered to be a new belt and should be tight-
ened to 110 to 140 pounds .
Place belt tension gauge (Borroughs Tool BT-33-
73F) or equivalent midway between the pulleys on
drive belt being checked. If the belt tension is incor-
rect proceed as follows:
1 . When power steering pump is driven by a sin-
gle belt.
a. Loosen the pump attaching bolts and ad-
just the belt to correct tension by moving the pump
outward, away from the engine .