Howden Roots RAS Whispair, Installation, Operation & Maintenance Manual

Page: 12 / 33

ILRB-3000 GEA20261
RAS and RAS-J WHISPAIR Blowers
Page 12 of 33
The opposite gear end sumps use constant level oilers. To
fill the sumps, remove the top glass reservoir. Fill it with oil,
place it on its holder, and let the bottle empty to fill the
sump. To obtain proper oil level in the sump that is toward
the center of the sight glass (90), pull out the level adjuster
(A) shown in Figure 6 and raise or lower the cross-arm (B)
as needed. Secure the cross arm with the lock (C), drop
the assembly back into the lower reservoir, and replace the
bottle. Note: Raising the cross arm (B) raises the oil level
and lowering it lowers the oil level.
During operation the sump levels can be expected to
fluctuate. At the gearbox sight window the level will rise as
a result of oil being thrown out of the secondary sump (oil
pan) into the primary sump. A satisfactory oil level is
assured as long as it is visible in the window. A blower
should not be operated when the oil is either above or
below the circle on the sight window.
Oil levels at the opposite gear end will fall slightly during
operation because of the apparent “loss” carried in the
bearings and on the shafts. If the level is visible in the sight
glass, a satisfactory amount of oil is present.
During the fi rst week of blower operation, check the oil
level daily and watch for leaks. Replenish oil as necessary.
Thereafter, an occasional check should be sufficient. Drain
plugs (67 and 88) are provided at the bottom of the
gearbox and bearing sumps.
Common Opposite Gear End Reservoirs
Some blowers are equipped with a common reservoir on
the opposite gear end. The small reservoirs are replaced
with a large cover similar to that covering the gear end.
The oil is transmitted to the bearings by use of a slinger
plate that dips into the oil. The oil is then captured and
directed to the bearings by oil control shields. Refer to the
sectional drawings at the back of this manual for help in
better understanding this system.
The lubrication of the gear end of the blower is accurately
described in the previous section. Refer to Table 5 to
determine the approximate opposite gear end oil sump
capacity.
Some blowers using the common O.G.E. reservoir are
supplied with oil level switches. The recommended
procedure for setting these switches is as follows:
1 Prior to starting the blower:
• Add oil to the reservoirs until the level is in the center of
the bullseye sightglasses.
• Disconnect the level switch from the blower shut down
system.
• Position the level switch slightly above the oil level so the
switch is not as yet reset.
ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf 12 03/09/2015 13:21:26