SB--7--621
Page 21
circumstances the impeller case can be
removed and reduced in width by machining
off the amount of excess clearance.
These
impeller--to--impeller
and
impeller--to--case
clearances
are
extremely critical. Even though the
blower may turn freely by hand when
cold, under operating conditions, the
parts expand, and the rotors are sub-
ject to slight deflection.
If the clearances are not sufficient,
the impellers may contact each other
or
the
housing
with
destructive
results.
If the clearances are too
great, the blower may not develop the
pressure or airflow that is required to
perform its function.
12. Impeller tip to case clearance should be checked
at this time by inserting the correct thickness
feeler gauge between the tip and the case and
rotating the impeller (see FIGURE 21, page 20).
Repeat the procedure on both impellers.
When checking the tip to case clear-
ance, move the feeler gauge over the
entire length of the impeller to ensure
that the tips do not bind along their
length.
13.
INSTALLING THE TIMING GEARS
A.
Apply a light grease, or oil, on the shaft area
where the timing gear will be positioned.
B.
Place feeler stock in the amount of 1/3 of the
total end clearance between drive headplate
and both impellers. This will stop the impel-
lers from contacting the headplate while the
gears are being driven on.
FIGURE 22
If
installing
gears
on
a
blower
containing mechanical seals, a press
must be used to drive the gears on the
shafts.
Blows from a hammer or
mallet will damage the seal.
C.
Secure the bearing retainer plate (12) to the
gear headplate using capscrews (10). Refer
to FIGURE 25, page 24, for torque specifica-
tions.
D. If reusing the timing gears, the gears should
be returned to their original positions. Use
taper pin holes and matchmarks for correct
positioning.
Replacement gears have minimum
backlash marks on the outside diame-
ter of the gear face.
These marks
should be located 180 degrees from
each other (see FIGURE 22).
E.
Using the driving tool shown on page 13,
drive one gear flush with the end of the shaft
and replace taper pin (8) by rereaming origi-
nal hole if the movement between the shaft
and gear was negligible. If rereaming fails to
eliminate edges set up by retiming, drill and
ream a new hole approximately 90
_
from the
Summary of Contents for Gardner Denver Sutorbilt Legend GAA P Series
Page 33: ...SB 7 621 Page 25 SECTION 8 PARTS LIST 300GAA810 B Ref Drawing ...
Page 35: ...SB 7 621 Page 27 200GAB810 D Ref Drawing ...
Page 37: ...SB 7 621 Page 29 300GAC810 A Ref Drawing ...
Page 39: ...SB 7 621 Page 31 300GAC810 A Ref Drawing ...
Page 42: ...Sunco Powder Systems Inc Blower Division Phone 704 545 3922 www suncoblowers com ...
