chevrolet truck Light Duty Truck 1994 Series, Руководство по ремонту

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VALVE AND STUB SHAFT
Figures 20 thru 25
9
Important
Valve assembly malfunction is uncommon,
except during seal replacement. Do not
service the valve unless indicated to do so.
❖
Disassemble
1. Seal (32) in the shaft cap end.
2. Stub shaft (31) from the valve body (28) (Figure 20).
• Hold the assembly and lightly tap the stub
shaft against the bench until the shaft cap is
free from the valve body.
• Pull the shaft assembly until the shaft
cap clears the valve body by about 6 mm
(1/4 inch).
• Disengage the shaft pin from the valve spool.
• Remove the shaft assembly.
• Push the valve spool out of the opposite end
of the valve body (28) until the seal (29) is
exposed.
• Carefully pull the spool from the valve body
while rotating the valve.
3. Seal (29) from the valve spool.
L *
m
Inspect
Seals (26) and rings (27) (see Figure 22).
Shaft pin for wear or cracks. If excessively
worn or broken, replace the complete valve
and shaft assembly.
Torsion bar and stub shaft (31) for leaking. If
there is leaking, replace the valve assembly
(see Figure 23).
Ground surface of the stub shaft (31). If a
crocus cloth cannot clean the nicks or burrs,
replace the valve assembly.
Outside diameter of the valve spool and
inside diameter of the valve body (28). If a
crocus cloth cannot clean the nicks or burrs,
replace the shaft and valve assembly.
The small notch in the skirt of the valve for
wear. If worn, replace the valve assembly.
Valve spool inside the valve body (28). The
valve spool, when lubricated with steering
fluid, must rotate freely without binding. If
binding occurs, replace the valve and shaft
assembly.
Important
Lubricate all wear surfaces with power
steering fluid.
A - DISENGAGE STUB SHAFT PIN
FROM HOLE IN SPOOL VALVE
Figure 20 Stub Shaft Assembly Removal and Installation
26 -SEAL, O-RING (VALVE BODY)
27 - RING, VALVE BODY
2 8 -BODY, VALVE
29 -SEAL, O-RING (SPOOL)
3 0 -SPOOL, VALVE
31 - SHAFT, STUB
32 - SEAL, O-RING (STUB SHAFT)