15
5.3.4 GREASE LUBRICATED BEARINGS — 21 (PLUS) SERIES ONLY
Service drive end bearing at regular intervals.
(See the
Suggested Lubrication Intervals for
Grease Lubricated Bearings
table, to the right.)
Use NLGI #2 premium grade, petroleum base
grease with high temperature resistance and good
mechanical stability, such as PneuLube grease
available from your local Tuthill Vacuum & Blower
System Professional. Using a pressure gun, force
new grease into each bearing until traces of clean
grease comes out of the relief fi tting.
NOTE
To avoid blowing out the drive shaft seal, do not grease too rapidly.
NOTE
Refer to Figure 5, which shows locations of grease fi tting and grease relief
for horizontal and vertical fl ow units (21 series).
5.4 PIPING CONNECTIONS
NOTE
Remove the protective covers from the inlet and outlet ports and inspect for
dirt and foreign material.
WARNING
Pipe loading on the blower should be negligible as pipe loading can cause
distortion of the blower. Use proper supports and pipe hangers to assure
that there is no loading.
Inlet and outlet connections on all blowers are large enough to handle maximum volume with minimum
friction loss. Maintain same diameter piping. Silencers must not be supported by the blower. Stress loads
and bending moments must be avoided.
Be certain all piping is clean internally before connecting to the blower. We recommend placing a 16-mesh
wire screen backed with hardware cloth at or near the inlet connections for the fi rst 50 hours of use until the
system is clean. Make provisions to clean the screen after a few hours of operation and completely discard
it once the system is clean, as it will eventually deteriorate and small pieces going into the blower can cause
serious damage. A horizontal or vertical air fl ow piping confi guration is easily achieved by rearranging the
mounting feet position.
SUGGESTED LUBRICATION INTERVALS
FOR GREASE LUBRICATED BEARINGS
SPEED
IN RPM
OPERATING HOURS PER DAY
8
16
24
GREASING INTERVALS IN WEEKS
750 - 1000
7
4
2
1000 - 1500
5
2
1
1500 - 2000
4
2
1
2000 - 2500
3
1
1
2500 - 3000
2
1
1
3000 & up
1
1
1