GMC 1976 ZEO 6083 Maintenance Manual page 550

9- 1 8 STEERING
the V-shaped notches at edges of discharge ports on
pressure plate. These notches must be clean and un-
damaged if pump noise is to be avoided, as they
cushion the hydraulic shock when each vane passes
the port.
3 . Inspect pump ring end surfaces for score
marks.
NOTE :
Because pump ring is treated, it leaves a
dull gray-black finish on wear surface. Wavy
grain appearance inside pump ring is normal .
4 . Inspect pump shaft for score marks, excessive
wear, or damage-particularly at splines, at keyway,
and at bearing and seal surfaces . Separate and in
spect rotor and vanes for wear and general condition.
5 . Inspect shaft bushing in pump housing. Re-
place pump housing if bushing is scored or exces-
sively worn .
6 . If any internal parts are found to be worn or
damaged, flush steering gear or disassemble gear and
clean internal parts.
Figure 17-Installing Shaft Seal
ASSEMBLY OF PUMP
1 . Install new pump shaft seal using seal protec-
tor J-22616 and seal installer J-7728 or a 1 inch
socket with an arbor press or hammer (figure 17).
CAUTION : DO not use any more force than
necessary to seat the seal.
2 . Lubricate new pressure plate "O" ring with
Power Steering Fluid, and install in third groove
from rear of housing.
3 . Clamp end hub of housing in vise in same
position as before and insert both dowel pins . (figure
16) .
CAUTION : Do not over tighten . The vice-
damage to the bearing could occur.
4 . Insert shaft through thrust plate and rotor, and
install new snap ring on shaft. Open the snap ring
just enough to slide over the end of shaft. (Rotor
must have counter sunk side toward thrust plate) .
(figure 18).
5. Insert shaft in housing, making sure thrust
plate slides properly on dowel pins .
6. Install pump ring on dowel pins with the arrow
toward rear of housing (figure 19).
7. Install all ten vanes in rotor slots with rounded
edge of vanes outward (figures 3 and 20). Vanes
should slide freely .
8. Lubricate pressure plate with Power Steering
Fluid to protect pressure plate "O" ring .
Figure 18-Shaft With Thrust Plate and Rotor