"Camel" Liquid Ring Medical Vacuum
Medical Systems
B-14
3.
Using feeler gauge, measure gap A between lobe and motor mounting flanges at four points
90 degrees apart. Make certain that feeler gauge leaves are tight fit in gap. Record four
measurements.
4.
Add four measurements recorded in step a.5 and divide total by 4 to determine average shim
gap and add 0.008 to 0.010 inch (0.20 to 0.25 mm) to average. Make certain that gap is not
underestimated since this will reduce running clearance.
5.
Select two sets of shims (4) equal to sum calculated in step a.6. Shim thickness can be slightly
greater than calculated value but NOT less.
CAUTION
DO NOT MOVE LOBE (106) ANY MORE THAN NECESSARY WHEN PERFORMING
FOLLOWING STEPS SINCE ANY EXCESS MOVEMENT MAY AFFECT
PERFORMANCE OF SHAFT SEAL.
b. Loosen lobe nuts (106-1) just enough [approximately 0.010 inch (0.25 mm) l to install shims (4).
c. Use pair of screwdrivers and move lobe just enough to install one set of shims (4) between lobe and
pedestal or motor on each side of pump between top and body lobe studs (106-2).
d. Tighten lobe nuts (106-1).
e. Remove tools installed in step a. 1, 2 or 3.
f. Tighten the lobe nuts (106-1).
g. Push shaft (302 or 401) towards pump end and manually turn shaft to ensure that shaft turns freely with
no rubs or binding. If rubs or binding is detected, loosen four lobe nuts to allow 1/8-inch (3 mm) play,
remove shims (4) and repeat steps a through f.
h. On stainless steel pumps, proceed as follows:
1.
Remove head (103) and gasket (103-3); clean head and lobe (106) flange faces.
2.
Remove rotor nut (110-1) and washer (110-3).
3.
Remove rotor (110) and rotor key (110-1).
4.
Perform step j.6, Section B.6.4.
5.
Clean and lightly oil face of rotating seal (2-1) and stationary seal (2-2) using clear light oil
(not grease).
6.
Reinstall tools installed in steps a.1, 2 or 3, and apply and maintain 100 pounds force (445
Newtons) minimum to end of shaft.
7.
Using clean depth gauge, measure and record distance from face of stationary seal to shaft
shoulder.
USE CARE NOT TO SCRATCH OR CHIP FACE OF STATIONARY SEAL.
8.
Subtract 7/8 inch (22.2 mm) from dimension recorded in step h.7.
9.
Lightly oil inner diameter of Teflon ring in rotating seal.
10.
Slide rotating seal onto shaft until sealing faces are in contact. Remove clips from rotating
seal.
USE CARE NOT TO DAMAGE TEFLON RING OR SEAL FACES.
11.
Compress rotating seal to obtain dimension computed in step h.8. Make sure that rotating seal
is compressed to proper dimension and square with shaft; tighten four setscrews (2-4) to
secure rotating seal to shaft.
12.
Clean any oil from shaft and shaft shoulder.
13.
Perform steps f.7 and f.8, Section B.6.4.
14.
Install rotor on shaft against shaft shoulder. Turn rotor clockwise to take up slack in keyway.
Fill rotor shaft bore cavity with Loctite 262.
