Manual 2007 Rev B p/n 2007
31
DISASSEMBLY OF BLOWER
WARNING
!
Before performing any repair or replacement,
disconnect and lock out power.
CAUTION
!
Remove all hazardous material and dispose
of properly. Clean the unit before starting
disassembly.
1. Remove the blower from the installation.
Drain lubricant from both ends by removing
the magnetic drain plugs. Mark the end
plates, covers, and housing so they can be
reassembled in their original confi guration.
On blowers with drive shaft lip seals only:
Skip step 2. Proceed to step 3.
2. On integral and drive shaft mechanical face
seal blowers only: Remove three socket-head
screws and dust plate using a 1/8 in. hex-head
(Allen) wrench. Using the same wrench, loosen
three set screws and remove the seal retainer.
3. Remove four socket-head screws (requires
5/32 in. hex-head [Allen] wrench). Place two
of the screws in the tapped jacking holes, and
remove the seal housing. Tap out the seal and
discard the O-rings.
4. Remove the gear cover cap screws and gear
cover by placing two of the screws in the
tapped jacking holes provided on the cover
fl ange. Support the cover with the lift straps or
other suitable means while removing it. The
jackscrews provide the force necessary to break
the seal between the cover and end plate.
5. Temporarily secure the end plate to the housing
with two screws and some fl at washers.
On blowers with drive shaft lip seals only:
Skip step 6. Proceed to step 7.
6. On integral and drive shaft mechanical face
seal blowers: Remove the mating ring of the
mechanical seal.
7. Remove four nylok screws from the drive shaft.
A light tap with a mallet will break it loose from
the drive gear. Remove the inner bearing race
with a gear puller or press.
8. Bend back the lock tabs and remove the cap
screws, lock washers and dowel pins.
9. Position the timing gears so both timing marks
are matched. See Figure 8-1. Rotate the drive
gear clockwise approximately three teeth, and
mark a matching reference line on each gear
(as shown in Figure 8-2). This gear position is
necessary so the rotors will clear and not jam.
Using a gear puller with a live center or a gear
puller with a centering adapter large enough
so it will not jam into the threaded hole, pull
the driven gear while keeping the matched
reference line marks aligned. Use a slight
rocking motion to make sure the rotors have
not jammed. Should jamming occur, release
pressure and tap the gear back on until it
rotates freely. Pull the mating gear.
DISASSEMBLY AND REASSEMBLY
08
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