PROPEL TRANSMISSION
SUBSECTION 9B
12. Slide the torque motor along the spool centerline and
6. Remove the pin extractor from the locating pin.
watch for spool motion. If longitudinal spool motion occurs,
engagement was properly completed.
NOTE
Failure to insert the bushing locating pin to a
The ball must engage the hole in the spool before pro-
sufficient depth in the valve body will prevent
ceeding with the control valve assembly. Carefully re-
proper installation of the hydraulic amplifier
peat steps 9 through 12, as necessary, to achieve the
assembly. This will result in external leakage
above condition.
a n d probable damage to the hydraulic
13. Tighten down four capscrews (25) using a 3/32 inch
amplifier assembly.
Allen wrench. Torque the screws to 9-1/2 to 10-1/2 inch-
Ibs.
7. Install O-rings (08) and (20) in the base of the hydraulic
14. Grasp the flapper extension between the forefinger
amplifier assembly. If hydraulic amplifier screens (21) were
and thumb and move the flapper toward the end of the valve
removed, install new ones by pressing them through the
body. Observe for spool motion to ensure that engagement
I.D. of the O-rings, coarse side first.
has not been lost.
8. Install left side seal plate (15) and end plate (14) and se-
cure with screws (28) and lockwashers (29).
15. If the feedback wire ball has become disengaged from
the hole in the spool, repeat steps 9 through 14.
9. Insert a small blade screwdriver into the spool end slot
and rotate the spool end slot to a vertical position (see Fig-
16. Set the controller on one end. Install O-ring (11) on in-
ure 9B-31). Look into bushing locating pin (09) and align the
let orifice assembly (12) and carefully insert the assembly
hole in the spool with the center of the bushing locating pin.
into controller body (27) Unless they are new, inlet orifice
assemblies should be discarded and replaced each time
they are removed.
Apply force only around the edge of the inlet
orifice assembly, or the filter may become
damaged and result in controller malfunction.
17. Place seal plate (15) on a flat clean surface. Install O-
ring (16) in the seal plate It may be necessary to work the O-
ring into the seal plate with a finger.
18. Install the seal plate and O-ring assembly. Install end
plate (14) on controller body (27). Using a 3/16 inch Allen
wrench, install screws (28) and lockwashers (29). Torque
the screws to 80-90 Inch-lbs.
19. Repeat steps 16 through 18 for the opposite end of the
controller.
20. Install the tension spring having the end loops of ap-
proximately equal length by attaching them from the groove
on the flapper extension to the spring retainer on the tip of
the barrel and shaft assembly. Install the tension spring
having one longer end loop with its shorter loop engaged in
the groove on the flapper tip, and the longer loop attached to
the spring retainer on the torque motor bracket.
21. Install the teflon tubing on each coil leadwire. Solder
Figure 9B-31. Spool installation
the coil leadwires to electrical connector (01) pins as
marked during disassembly. Slide the teflon tubing over the
10. With the mounting face of the valve body oriented away
connector pins. Install motor cap gasket (06) on the con-
from the assembler and the leadwires of the hydraulic
troller body.
amplifier extending to the right, hand install four cap-
22. Install gasket (02) on electrical connector (01). Hold the
screws (25) and lockwashers (26) to hold the hydraulic
electrical connector in position in motor cap (03). Using a
amplifier assembly in place on the body. Do not tighten the
5/64 inch Allen wrench, install screws (22) and torque to a
screws at this time.
snug condition.
11. Carefully insert the feedback wire into the hole in bush-
23. Install gasket (06) and motor cap (03) on the controller
ing locating pin (09). Using extreme care, engage the feed-
body. Using a 9/64 inch Allen wrench, install two socket
back wire ball in spool (30) hole.
9B-18
