SM11-011-0
Page 8
3.
Inspect all springs for wear on the OD, for
4.
Place the special tool (thimble) over the cou-
cracks or permanent set. Replace all defective
pling end of the shaft assembly and press the assem-
springs.
bly into the body (21). Press on the outer race of the
bearing bore. Remove the thimble from the shaft.
4.
Inspect the bearings for wear or flat spots. If the
5.
Install the snap ring (15) into the body (21).
bearings are rough or loose they must be replaced.
Ensure the snap ring is fully seated in the groove.
5.
Inspect the cam ring for excessive wear (ripples
or washboard marks on the contour). Replace a badly
NOTE
worn or defective cam ring.
The special screws and the port plate in-
6.
Inspect the rotor for scored, marred, or
cluding the internal threads must be de-
greased. Apply a very small amount of
scratched (faces and vane slots) surfaces. Replace a
defective rotor.
Loctite No. 242 to the special screws
only. An excessive amount of Loctite on
the screws would be forced into the
7.
Inspect the vanes for excessive wear marks
(burrs, nicks, and scoring). Replace any defective
shuttle spool bore when the screws are
vanes.
installed. Allow the Loctite to cure for
one hour after installing the screws.
8.
Inspect the wear surfaces of the port plate and
end cap for deep scratches. Replace if defective.
6.
Install one of the special screws in the shuttle
spool bore of the port plate. Torque the screw 3 to 5
9.
Inspect the body and end cap for cracks or other
pounds-foot (0.41 to 0.69 kgm) maximum. Insert the
casting damage. Replace all damaged castings.
shuttle spool in the shuttle bore and install the other
special screw and torque. Tilt the port plate sub-as-
10. Inspect the shaft for excessive wear (internal,
sembly back and forth to be certain that the spool
spline, bearing surface, and drive end). Replace if
travels the full length of the bore.
defective.
7.
Lubricate the seals (13 and 14) and then install
ASSEMBLY.
on the back of the port plate.
Immerse the seals and bearings in clean hydraulic
8.
Place some heavy grease on the section seal
fluid to make the assembly easier and to provide
(14) on the back of the port plate (12).
initial lubrication.
9.
Insert the dowel pin (11) in the hole in the face
1.
Press the bearing (17) on the shaft (18) to the
of the port plate assembly.
shoulder and install the external snap ring (1 6). En-
10. Thread two No. 10-24 screws in the tapped
sure the ring is seated in the snap ring groove.
holes in the face of the port plate assembly (12) and
2.
Place the body on a clean flat surface with the
install in the body. See the exploded drawing for the
large open end facing up.
correct position.
NOTE
CAUTION
Steps 3 and 4 require the use of the spe-
Ensure the springs are started in the holes
cial assembly tool.
in each rotor slot.
3.
Install the felt wiper (20) into the body (21).
11. Place the cam ring (7), rotor (8), vanes (9), and
Place the shaft seal (19) onto the shaft seal driver
vane springs (10) on a clean flat surface. Arrange the
with the open face of the seal against the driver.
vanes side by side with the three spring holes up.
Apply lubricating fluid to the O.D. of the seal and
Insert the vane springs in the vanes. Install the vanes
install the seal in the 1.5-inch bore of the body (21).
with the springs in the slots in the rotor.
