Spencer Power Mizer Multistage Centrifugal Cast Blowers - Manual (Page 9)

9
Blower Bearings–Oil Lubricated
General Oil Lubrication Information
CAuTIOn: If equipped with oiler, keep the oiler at least 1/3
full at all times.
Use Mobil SHC626 synthetic oil or equivalent (see list, page 7).
Each blower is shipped with an adequate amount of Mobil
SHC626 oil for one oil change. The oil should be changed at
least once a year.
1. Drain oil (preferably when hot) by removing the drain plug
in the bearing sump.
2. Replace drain plug, fill the oiler and tighten the oiler screw
cap finger tight. See Oil Filling section on page 7.
CAuTIOn: A loose or overtight screw cap will cause oiler
malfunction. Do not distort the cap O-ring by overtight-
ening.
Oiler Tips
There are several O-rings and gaskets in the oiler; leaks at
any point can cause trouble. For example, if there is a leak in
the oiler reservoir, the oiler will overfill the bearing sump.
Keep the oiler parts clean–dirt or contamination can initiate a
leak.
Air leaks above the oil level do not produce bubbles, even as
the oil feeds.
Pressures in the oiler and oil sump must be equal. Do not
remove the vent line while the blower is operating.
Bench Testing Oilers
Use the following procedure to trouble-shoot malfunctioning
oilers that exhibit oil leaks or overfilling.
1. Secure oiler so it is level in all directions.
2. Plug outlets with pipe plugs.
3. Remove fill cap and fill reservoir completely.
4. Quickly screw fill cap back on reservoir.
NOTE: When you close the fill cap, the check valve opens,
allowing oil to fill the view port.
5. When the fill cap is tightened securely, the oil in the view
port should seek a level at or near the level mark scribed in
the casting.
Let the oiler sit for several hours. If oil fills the view port
completely and is seeping out the vent hole, the seals are
bad. The oiler needs to be repaired or replaced.
Series 2500, 3500
Oil Height Settings
Power Mizer Series 2500 and 3500 blowers have nonad-
justable oilers hard-piped directly into the sump. There is no
need to check oil height settings but make sure the sump and
oiler are level.
Filling Oilers
Replenish oil in the reservoir only after it drops below half full,
which will reduce the number of refills. If the oiler needs
frequent filling, this is not normal–look for an oil leak.
Note: Oilers ‘nuisance feed’ as the reservoir is screwed off
and on, which can lead to an overfilled sump. Screw on the
oiler reservoir quickly to minimize overfilling. Tighten the
reservoir only hand-tight.
Allow the oil to stabilize for one hour. Fill the oiler with Mobil
SHC626 or equivalent, replace the oiler reservoir, and tighten
it to allow the oiler to feed. Repeat as necessary until the oiler
stops feeding (bubbles stop appearing). The oil level should
be at or slightly above the center of the oiler sight glass (lower
portion of oiler).
Series 3000, 4000, 5000, 6000
Oil Height Settings
The following instructions apply only to Power Mizer Series
3000, 4000, 5000 and 6000 blowers, which have adjustable
oilers. Both bearings on these blowers must be checked for
proper oil height settings before starting. Oiler level settings
are preset at the factory, but an uneven foundation or shipping
damage can disturb them.
CAuTIOn: Oil height settings are critical. The oil height in
a bearing sump must be maintained within a narrow
range to lubricate the bearing correctly. Too much or too
little oil will lead to excessive heat generation, degrading
the oil and shortening the bearing life.
First, be sure the sump and oiler are level. The oiler may be
leveled or the oiler height adjusted by loosening the 8mm oiler
bracket bolt. Leave some tension on the bolt to keep the oiler
from moving too freely. With a small carpenter’s level, line up
the oiler scribe lines with the sump sight glass and set the oil
height as follows.
The inlet end bearing oil level scribe line should be set 1/16"
below the bearing sump sight glass center. On the discharge
end, however, the oil level scribe line should be even with the
sight glass center.
Once stabilized, the oil level observed in the view port is the
oil height in the oil sump. After initial operation, a level of
approximately 1/8"-1/4" above the initial setting is normal
when the blower is idle.
Filling Oilers
Replenish oil in the reservoir only after it drops below half full,
which will reduce the number of refills. If the oiler needs
frequent filling, this is not normal–look for an oil leak.
NOTE: Oilers ‘nuisance feed’ as the cap is screwed off and
on, which can lead to an overfilled sump. Screw the oiler cap
quickly to minimize overfilling. Tighten the cap only hand-tight.
Oil Level
Bearing Oiler