MCi Crusader II 1989 Maintenance Manual page 46

1-1-89
Page
2-18
MC-9 MAINTENANCE MANUAL
5. Attach a spring scale to the end of the cord.
6. Pull the cord with scale on a horizontal line. As the bear-
ing cage rotates. read the v:alue indicated on scale. Make.a note
of reading (Figure 2-44).
NOTE: Do not read starting torque. Read
only the torque value after the cage starts to
rotate. Starting torque will give a faJse read-
ing.
7. Measure· the diameter of bearing cage where the cord
was wound. Measure in inches or centimeters (Figure 2-45).
DIAMETER
OF CAGE
Figure 2-45. Measuring Diameter Of Cage.
8. Divide the dimension in half to get the radius. Make a note
of radius dimension.
9. Use the following procedure to calculate the bearing
preload (torque).
Pounds pulled x Radius (inches)
+
lb.-in. preload x .113-
+
Nm preload
OR
Kilograms pulled x Radius (centimeters) +
kg-cm preload x .098
+
Nm preload
Examples:
Reading from spring scale
+
7.5 pounds (3.4 kg)
Diameter of bearing
+
6.62 inches (16.8 cm)
Radius of bearing cage
+
3.31 inches (8.4 cm)
7.5 lb. x 3.31 in.
+
24.8 in.-lb. preload x .113
+
2.8 Nm preload
OR
3.4 kg x 8.4 cm
+
28.6 kg-cm preload x .098
+
2.8 Nm preload
10. If the preload (torque) of pinion bearings is not within
specifications. do the following procedure, then repeat steps 1
to 9. To increase preloact install a thinner bearing spacer. To
decrease preload, install a thicker bearing spacer.
11. Check the bearing preload with the drive pinion and
cage assembly installed in the carrier. Follow the procedures to
adjust preload of pinion bearings. yoke or flange method.
Yoke or Flange Method
1. Install the input yoke or flange, nut and washer on the
drive pinion. The yoke or flange must be against the outer
bearing.
NOTE: If the flt between the yoke or flange
splines and drive pinion splines are tight,
use a press to install the yoke or flange
(figure 2-46). If a press is not available; use
the three-piece pilot tool for installation.
See the procedure in earlier pages of this
section.
INPUT
FLANGE
SHOWN
Figure 2-46. Pressing On Flange Or Yoke.
CAUTION: Do not install tight fit yokes or
flanges on shafts using a hammer or mallet.
A hammer or mallet will damage the yoke or
flange.
2. Temporarily install the drive pinion and cage assembly in
the carrier. Do not install shims under the bearing cage (Figure
2-47).
3. Install the bearing cage to carrier capscrews. W'1shers
are not required at this time. Tighten the capscrews hand tight.
4. Fasten a yoke or flange bar to the input yoke or flange.
The bar will hold the drive pinion in position when the nut is
tightened (Figure 2-47).
Figure 2-47. Placing Pinion And Cage Assembly In Carrier.