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B. Assembly of Rotor Shaft.
1. Rotate the adapters in each rotor so the timing marks
(see Figure 10) are phased 180 degrees apart with hex
bores aligned.
2. To assist with aligning timing marks between rotors, use
chalk or marker to mark two rotor shaft flats 180
degrees apart next to the threaded end. The selected
flats would have to align with the timing marks on any
rotors not removed during servicing.
3. Install the required components in the sequence shown in Figure 6, double-checking the timing
mark locations and spacer lengths (see following table) as each rotor is installed.
SPACER LENGTH
(inches)
A 3 13/16
B 7 1/4
C 7 1/4
D 7 1/4
E 3 5/16
NOTE: THE SPACERS MUST BE FULLY SEATED IN EACH ADAPTER COUNTER BORE BEFORE
TIGHTENING. DO NOT FORGET TO PLACE THE BEARING STAMPINGS ON EACH OF THE SHAFT
BEARINGS DURING REASSEMBLY. ALSO, THE 3/8" CARRIAGE BOLTS SHOULD BE PLACED IN THE
BEARING STAMPINGS ON THE DRIVE END OF THE SHAFT BEFORE THE SHEAVE IS REPLACED.
4. Replace the 1-1/8" hex jam nut and rotate each rotor occasionally as the nut is being torqued to 350 ft-
lbs. If any rotor locks up, the bearing adapters in the rotor are probably not phased 180 degrees apart.
D. Installation of Main Shaft Assembly
Reinstall the rotor shaft into main frame by reversing the shaft removal steps outlined in I-A. Refer to Figure
6 for correct location of bearing stampings, bolts, etc. Tighten the 3/8 flange lock nuts at each bearing to 35
ft-lbs.
CAUTION
ROTOR SHAFT ASSEMBLY
BEARING ADAPTERS IN THE
TIMING MARK FOR PHASING
Figure 10. Timing Mark
CAUTION
CAUTION
CLEAN THE ROTOR SHAFT THOROUGHLY REMOVING ANY BURRS THAT WOULD KEEP THE ROTOR
ASSEMBLIES FROM SLIDING ON FREELY. IF A BEARING ADAPTER JAMS, THE INTERNAL BEARING
SEAL COULD BE FORCED OUT AND IT IS NOT REPLACEABLE.
IF THE BEARING ADAPTERS ARE NOT PRECISELY TIMED 180 DEGREES APART
IN EACH ROTOR AND ALIGNED BETWEEN ROTORS, SERIOUS DAMAGE WILL
RESULT.
THE TWO STAMPINGS ON EACH BEARING ARE IN CONTACT WITH EACH OTHER IN THE
ASSEMBLY. NEVER SEPARATE THE BEARING STAMPINGS TO STRADDLE A FRAME MEMBER.
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