BAC VX Series, Руководство по эксплуатации и техническому обслуживанию

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W W W . B A L T I M O R E A I R C O I L . C O M . A U
M A R 1 1 3 - 0
Maintenance Procedures
Make-Up Valve (cont.)
Fan Shaft Bearings
Ball Bearings
WARNING: Do not use oils
containing detergents for bearing
lubrication. Detergent oils will
remove graphite in the bearing
sleeve and cause bearing failure.
Also, do not disturb bearing
alignment by tightening bearing
cap adjustment on a new unit as
they are torque adjusted at the
factory.
Figure 1a - Operating Water Level
Fan Shaft Bearings
The fan shaft is supported at each end by ball bearings (See Figure 2),
each equipped with a lubrication fitting and locking collar.
Models VXT-65 through 135, VXI-S27 and 36, and VXCS-72 through
135 also have intermediate ball bearing(s) located midway on the shaft.
Ball Bearings
Under normal operating conditions, the bearings should be greased
every 2,000 operating hours or at least every six months. The bearings
should also be greased at seasonal start-up and shutdown. Lubricate the
bearings only with one of the following water resistant inhibited greases
which are good for ambient temperatures ranging from -54°C to 120°C
American - Rycon Premium #3
Exxon - Beacon #325
Shell - Aeroshell #17
Mobil - Mobilgrease #28
Chevron - SRI #3
Keystone - 84 EP Light
The bearings should be lubricated only with a hand grease gun. Do not
use high pressure grease guns since they may rupture the bearing seals.
When lubricating, purge the old grease from the bearing by gradually
adding grease until a bead of new grease appears at the seal.
Figure 2 - Ball Bearing