Manual 2007 Rev B p/n 2007
33
08
Disassembly and Reassembly
14. Clean and inspect the parts for damage and
wear. Replace all O-rings, seals, and bearings
at each overhaul.
OTE: N If end plates, housing or end covers are
not being reassembled in their original
position or some new parts are being
used, it will be necessary to clean all paint
or rust build-up from the mating surfaces
to ensure a good seal. Failure to do so
could result in excessive end clearances
and air or oil leaks.
ASSEMBLY OF 7000 BLOWER
The assembly procedure is generally the same
for all series, but notations are made where there
are differences. Dowel pins are used to locate end
plates, housing, and end covers in their proper
locations relative to each other. Be sure the dowel
pins are in place. Use an O-ring lubricant on all
O-rings.
It is recommended that the gear end rotor shaft
bearings be purchased from Tuthill Vacuum &
Blower Systems, as they are specially ground to
locate the rotors with correct end clearance relative
to the gear end plate.
Make sure all parts are clean and free of any
nicks or burrs caused by disassembly. Lip-
seal blowers will require all sleeves or seal
journals to be polished to remove any nicks or
scratches. Failure to polish seal journals will
result in seal leakage or damage. See Special
Tool Drawings on page 43 for information
and dimensions on seal pressing tools as well
as other assembly tools required.
When rebuilding the model 7000 blowers and
depending on the series designation, it may
be necessary to reseal the joints between the
rotor housing, end plates, and end covers.
The following sealant is recommended and
available for purchase from Tuthill Vacuum &
Blower Systems: Loctite 5699.
Preparation of End Plates for Assembly
1. Press the labyrinth seals into the seal bores
with the lips toward the oil side.
OTE: N For lip-seal blowers, put a light coat of
silicon in the seal bore of the end plate.
Install the lip seal open side facing up.
Mechanical Seal Blowers
2. Install O-ring spacers with the grooves up.
Install O-rings, making sure they are fully
seated in their grooves. Apply a thin coat of
sealant to the O.D. of the seal, and press into
seal bore. Make sure the seals are fully seated
without deforming. Clean the seal carbon
with soft tissue and a cleaning agent such as
acetone.
Gear End Assembly
3. Place the free end plate on a suitable blocking
with the rotor side up. Stand the rotors into each
bore with the gear end shafts up and keyways
facing in the direction shown in Figure 8-3.
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