Installation Manual 5000MM
Page 5 of 9
May 2019
SEAL DISC ASSEMBLY & INSTALLATION
After installing blades, seal disc should be installed on the
previously installed seal disc hardware as shown in Figure 8
for 6 to 8 bladed hubs. For 9 to 12 bladed hubs, first install
self adhesive rubber gaskets on both flanges of one seal disc
half. Bolt two halves of seal disc together, using 3/8" NC
bolts, flat washer, lock washer, and nut. Torque to 15 ft
-
lb
(lubricated) and 20 ft
-
lb (dry). Then, install seal disc on the
previously installed seal disc hardware as shown in Figure 8.
Install flat washer, then place seal disc on top. Install an-
other flat washer, lock washer, and nut on top. Tighten
3/8”
NC nut to recommended standard of 15 ft
-
lb
(lubricated) or 20 ft
-
lb (dry). If difficulty is encountered,
loosen bolts on seal flanges until seal disc can be mounted,
then re
-
tighten
NOTE
:
The purpose of the seal disc is to prevent adverse
air recirculation at non
-
aerodynamic portion of the fan
blade, hence increasing efficiency.
CHECK SWEEP
Measure the distance from trailing edge at blade tip of one
blade to trailing edge at blade tip of the adjacent blade (See
Figure 7a). This distance should be within
1”
of each other for
all successive blades. Correct blade sweep by loosening clamp
bolts and adjusting blade to match sweep of other blades. Re
-
tighten bolts and re
-
check sweep and pitch angle setting. Re
-
tighten blade clamp bolts to recommended standard per Table
1.
Figure 7a
Note: Refer to instructions included with seal disc for further
details.
Figure 8
CHECKING TIP CLEARANCE
Rotate fan in position inside fan stack to check tip clearance
(See Figure 9). The recommended tip clearance is between 1"
and 1 1/2". Check for spots where fan blade clearance is not
within the recommended tolerance. If necessary, adjust fan
stack by shimming to obtain proper clearance.
Figure 9
Tip
Clearance
