Manual 2007 Rev B p/n 2007
32
08
Disassembly and Reassembly
Never attempt to pull the gear when rotors are
jammed. Rotor keyway damage will result.
Drive Gear
Driven Gear
Figure 8-1 – Timing marks matched
Figure 8-2 – Timing marks advanced 3 teeth (reference
marks aligned)
10. Repeat the procedure used in step 4 to remove
the free end cover. Remove the rotor shaft
screws as was done in step 6. Remove the oil
slinger. Remove cap screws and oil retainer
rings. Place the 1/2 in. eye bolt into the holes
provided for lifting:
• At the top of the end plate on horizontal fl ow
series blowers
• At both sides of the end plate on vertical
fl ow series blowers
11. Make up four pieces of threaded rod 1/2”-13
UNC approximately 9 in. (23 cm) long with
double nuts or a single welded nut to turn rods.
On the opposite ends, remove about 1/2 in.
of threads as this end will mushroom slightly
when jacking the end plate. This will prevent
the threads from jamming when the rods are
being removed. Run in equally to remove the
end plate. Tap out the roller bearings. Note
that each bearing on this end has two identical
spacers, one on each side of bearing. Tap out
the seals. Also remove the labyrinth seals, as
they should be replaced with each overhaul.
On process mechanical face seal series
blowers, discard the O-ring and keep the
O-ring spacers for reassembly.
12. Remove the cap screws and bearing retainer
rings from the drive end of the blower. Remove
the rotors. To remove the rotors from the end
plate will require either a two-jaw gear puller
with jaws inserted in the oil feed slots of the
bearing bore, or a bar-type puller using the
tapped holes around the bearing bore.
CAUTION
!
If rotors are side by side, position the lobes
vertically when removing. If they are one on
top of the other, remove top rotor fi rst in a
vertical position. Then position bottom rotor
vertically and remove.
13. Support the end plate with the eyebolts and lift
strap. Remove the temporary cap screws, and
tap the end plate from the housing. Remove
the bearings and seals.
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