GMC 1982 Light Duty Truck Service Manual page 268

3B3-12 POWER STEERING SYSTEM
6. Close gate valve fully 3 times. Record the highest
pressures attained each time.
NOTICE: Do not leave valve fully closed for more than 5
seconds as the pump could be damaged internally.
a. If the pressures recorded are within the listed specs
and the range of readings are within 50 PSI, the
pump is functioning within specs. (Ex. Spec. 1250 -
1350 P S I - r e a d in g s - 1270- 1275 - 1280).
b. If the pressures recorded are high, but do not repeat
within 50 PSI, the flow controlling valve is sticking.
Remove the valve, clean it and remove any burrs
using crocus cloth or fine hone. If the system contains
some dirt, flush it. If it is exceptionally dirty, both the
pump and the gear must be completely disassembled,
cleaned, flushed and reassem bled before furth er
usage.
P O W E R S T E E R IN G G E A R
Rem oval
1. Disconnect hoses at gear. W hen hoses are discon­
nected, secure ends in raised position ot prevent
drainage of oil. Cap or tape the ends of the hoses to
prevent entrance of dirt.
2. Install two plugs in gear fittings to prevent entrance of
dirt.
3. Remove the flexible coupling to steering shaft flange
bolts (G, C and K models) or the lower universal joint
pinch bolt (P models). M ark the relationship of the
universal yoke to the stub shaft.
4. M ark the relationship of the pitman arm to the pitman
shaft. Remove the pitman shaft nut or pitman arm
pinch bolt and then remove the pitman arm from the
pitman shaft using Puller J-6632 (Fig. 3B3-13).
5. Remove the steering gear to frame bolts and remove
the gear assembly.
6. G, C and K Models - Remove the flexible coupling
pinch bolt and remove the coupling from the steering
gear stub shaft.
Fig. 3B3-13--Removing Pitman Arm
7. If the pump checks within specifications, leave the
8. S h u t off engine, remove testing gauge, spare hose,
ON-VEHICLE SERVICE
Installation (Fig. 3B 3-14)
1. Install the flexible coupling onto the steering gear stub
2. Place the steering gear in position, guiding the coupling
3. Install the steering gear to frame bolts and torque to
4. If flexible coupling alignment pin plastic spacers were
5. If flexible coupling alignment pin plastic spacers were
T O O L — J - 5 5 0 4
c. If the pressures recorded are constant, but more than
100 PSI, below the low listed spec., replace the flow
control valve and recheck. If the pressures are still
low, replace the rotating group in the pump.
valve open and turn (or have turned) the steering wheel
into both corners. Record the highest pressures and
com pare with the m ax im um pum p pressures and
compare with the m aximum pump pressure recorded.
If this pressure cannot be built in either (or one) side of
the gear, the gear is leaking internally and must be
disassembled and repaired. See the current Overhaul
Manual.
reconnect pressure hose, check fluid level a nd/or make
needed repairs.
N O TIC E: See N O T I C E on page 1 of this section
regarding the fasteners referred to in steps 1, 3, 4 and 5.
shaft, aligning the flat in the coupling with the flat on
the shaft. Push the coupling onto the shaft until the
stub shaft bottoms on the coupling reinforcem ent.
Install the pinch bolt and torque to specifications.
NOTICE: The coupling bolt must pass through the shaft
undercut, or damage to the components could occur.
bolt into the steering shaft flange.
specifications.
used, make sure they are buttomed on the pins, tighten
the flange bolt nuts to specifications and then remove
the plastic spacers.
not used, center the pins in the slots in the steering shaft
flange and then install and torque the flange bolt nuts to
specifications.