Chevrolet 10 Series 1967, Service Manual

Page: 469 / 605

STEERING 9-15
tim es without rolling car to change tire-to-floor
contact area.
c. Hold steering wheel against a stop momentarily
and read pressure gauge. If the maximum pres­
sure is below specifications, a faulty hydraulic
circuit is indicated. To determine which part is
faulty, proceed with test number two.
Test Number Two—Oil Circuit Closed
a. Slowly turn shut-off valve on J-5176 to closed
position and read pressure indicated on gauge.
Quickly reopen valve to avoid pump damage. If
indicated pressure is less than specification,
pump output is below requirement and pump may
be considered faulty. If pressure indicated is
within specifications, it may be safely assumed
that the external hoses, connections, valve and
adapter or steering gear is at fault.
NOTE: If pump proves faulty in test number
two, test should be repeated after pump is re­
paired and installed in vehicle. This will provide
a means of checking the repairs made to the
pump and the condition of the steering gear or
valve and adapter which may also be faulty.
Fig. 27—C hecking Fluid Temperature
COMPONENT REPLACEMENT AND REPAIRS
POWER STEERING PUMP
Removal
1. Disconnect hoses at pump. When hoses are discon­
nected, secure ends in raised position to prevent
drainage of oil. Cap or tape the ends of the hoses to
prevent entrance of dirt.
2. Install two caps at pump fittings to prevent drainage
of oil from pump.
3. Loosen bracket-to-pump mounting nuts.
4. Remove pump belt.
5. Remove bracket-to-pump bolts and remove pump
from vehicle.
Fig. 28—C l 0-20-30 Control V a lv e and Power
C ylin d er Installed
6
. Remove drive pulley attaching nut.
7. Remove pulley from shaft. Do not hammer pulley off
shaft as this will damage pump. Use Tool J - 2 1 239-1
for pulling stamped pulleys or Tool J-8433-1 with
Adapter J-8433-2 for cast pulleys.
Installation
1. Install pump pulley.
CAUTION: Do not hammer on pump shaft. Use
pulley nut to pull pulley onto shaft.
2. Position pump assembly on vehicle and install
attaching parts loosely.
3. Connect and tighten hose fitting.
4. Fill reservoir. Bleed pump by turning pulley back­
ward (counterclockwise as viewed from front) until
air bubbles cease to appear.
5. Install pump belt over pulley.
6
. Tension belt as outlined under "Pump Belt Tension—
Adjustment" in this section.
7. B l e e d as o u t l i n e d under’TMaintenance and
Adjustments. ”
CONTROL V A LV E -C -K 10-20, C30 (Figs. 28-29)
Removal
1. Raise the front of the vehicle off the floor and place
on stands.
2. Remove the relay rod or connecting rod to control
valve clamp bolt.
3. Disconnect the two pump to control valve hose con­
nections and allow fluid to drain into a container,
then disconnect the two remaining valve to power
cylinder hoses.
CHEVROLET TRUCK SERVICE M ANUAL
I