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37-1-615 Page 47
FIGURE 7-25
27. Install the bearing clamp plates (10, 11) with
“Nylok” type screws (47), FIGURE 7- 26, tighten screw
to 51-68 ft-lb.
Check the fit of the key (41) in the gear hub (9) and pinion (7). Check the pinion, hub and shaft
extensions for burrs. Install the keys in the shafts, making sure of a snug fit. Heat the pinion and hub
in oil or dry heat, such as an oven (NEVER USE TORCH) to 350°F, for thirty minutes minimum to
allow for complete heat penetration. If heating with oil in a confined area, use of cooking oils will
prevent undesirable odors.
Lock the rotors from turning with a piece of hard wood or belting. Install the hub (9) and pinion (7)
and pull tight with a locking device, FIGURE 7- 26. Use the hub retainer (13) and screws (49) to pull
hub up tight against the bearing. Tighten screws to118-140 ft-lbs.
Install lockwasher (35) and bearing retainer nut (33). Tighten nut to 230-250 ft-lb. As the hub and
pinion cool, check for tightness. The bearing and bearing spacer must be clamped tight against the
rotor. Bend the ear of the lockwasher (35) into the slot of the nut (33) holding the pinion. Oil the
bearings generously.
The final check to be made for running clearances
is dividing the interlobe clearance of the rotors
to prevent metal-to-metal contact
. This is referred to as
“TIMING OF ROTORS”
and is accomplished
in the following five steps.
28. Install the gear (8) on the hub (FIGURE 7-27), which is a slip fit. If gear teeth were marked at
disassembly, line up these marks. New gears are not marked and should be positioned so tapped
holes allow radial movement of the gear for timing. Tighten the
“Nylok” screws (48) against the flat
washers (57) (always use new washers) just tight enough to allow the gear to slip radically on the hub.
Mount an indicator and button bracket as shown in FIGURE 7-27. In order to accurately follow the
next four steps in timing, the indicator must be mounted in a clockwise position for the bracket. The
gear has a 3/8-16 tapped hole for indicator support. When the indicator is mounted, hold the gear
from rotating and with a wrench in one of the hub retainer screws, move the shaft in a clockwise
direction until all slack is taken out of the gears and rotors to give a metal-to-metal contact. To
prepare for the first reading, set the indicator at zero.
FIGURE 7- 26
FIGURE 7-27