16
14)
Mechanical Seal Boosters
– Install mating rings same as gear
end, No. 5.
Slinger Seal Boosters –
Install seal slinger same as gear end.
Install bearing spacers (123) on each shaft.
15) Lubricate shafts and install roller bearings (10).
CAUTION:
Inner race of bearing has a flange on one side only.
This flange must face outward. See Figure 8.
16) Install oil retainer rings (14) with button head screws (30). Only
two required for each ring.
17) Install spacer (67) on each shaft. Install oil slinger (21) on
lower rotor, (either shaft on vertical flow units) spacer (57) on
opposite shaft, washers (25), and screws (29). Lay assembly
down with drive on left for timing.
18) Using feeler gauges take interlobe readings and record on each
side of housing as indicated in Figure 9. By removing or adding
shim behind the helical gear, it rotates as it is moved in or out
and the driven rotor turns with it, thus changing the clearance
between rotor lobes. Changing the shim thickness .006 will
change the rotor lobe clearance .003 or one half the amount.
EXAMPLE:
Referring the Figure 6, check the clearance at AA
(right hand reading) and BB (left hand reading). If AA reading
is .009 and BB reading .003 by removing .006 shims, the
readings will change one half the amount removed or .003. AA
should then read .006 and BB should read .006. The final
reading should be within .002 of each other.
To determine the amount of shim to add ore remove, subtract
the small figure from the larger. If the right side reading is
higher than the left side, remove shim. If the right side reading
is lower, add shim.
19) Install drive shaft (45) and secure with allen screws (66). Check
drive shaft runout behind keyway. Do not exceed .002 T.I.R.
(Total Indicator Reading). Install lockwire (49).
20) Remove temporary cap screws from gear end plate and apply a
bead of sealer around end plate (not cover), encircling all holes,
and install gear cover (6) and secure with cap screws (26A).
NOTE:
If cooling coil or fittings were disturbed or water was
detected in drain oil, they should be retested with air pressure to
check for leaks and resealed. (Mechanical Seal Boosters only.)
21) Install cover (6).
22) Install new mechanical seal (76) into seal housing (91), and
press in lip seal (13).
23) Install mating ring (76) onto drive shaft and install assembled
seal housing.
24) Be sure to lubricate seals before final assembly.
Adjusting Rotor
Interlobe Clearance
Drive Shaft Seal
Assembly
