Blower Repair & Maintenance Manual #34-05198-6 v1.2 11.2014
18
SECTION THREE:
REPAIR AND REPLACEMENT
With proper maintenance and lubrication, normal life of bearings, gears and seals can be expected. To
maintain the efficiency of your unit, however, these parts must be repaired or replaced when required.
Fig. 16
TIMING GEAR AND HUB REMOVAL
1. Remove the gear case (Refer to Gear Case Removal subsection).
2. Remove the lock nuts (
A
) and lock washers (
B
) from both shafts. Match-mark the shafts, gears
and hubs to assure proper repositioning on completion of maintenance work. We recommend
gears be replaced in sets only.
3. If maintenance work does not require detachment of gears from the timing hubs, these
subassemblies should be withdrawn from their respective serrated shafts simultaneously. On
completion of maintenance work, the return of the gear-hub sub-assemblies to their matched-
marked positions will eliminate the need for retiming.
4. If gears must be detached from the timing hubs during repair work it is important that the unit be
retimed, To separate gears (
C
) from hubs (
D
), remove four cap screws (
E
) from each assembly.
5. To reassemble, snug up but do not tighten bolts which hold gears to hubs and restore to their
respective shafts. Replace
– but do not tighten – the lockwashers and nuts to each shaft.
Establish a position for one shaft and tighten the bolts, lockwashers and nut on that shaft only.
Then proceed with retiming in accordance with instructions outlined in “Resetting Impeller
Clearances”. Tighten the lockwashers and nuts and use a torque wrench to tighten the cap
screws on the timing hub. Replace the gear case and follow “Blower Start-up Checklist”