Farm Fans C-2120A, Руководство оператора, Страница: 49 / 68

3. Slide propeller over motor shaft and locate it against
the motor.
4. Align the keyway in the bushing with the key and
SLIDE bushing onto motor shaft. Do not attempt to
drive the bushing onto the shaft, as it may damage the
motor bearings.
5. Rotate the bushing and propeller so their alignment
marks are in line and loosely attach the propeller to the
bushing. Make sure the capscrews are inserted into
the unthreaded clearance holes in the bushing. Refer
to previous CAUTION note. Locate the bushing so it is
approximately flush with end of motor shaft.
NOTE: The bushing must be located far enough for-
ward so the inside web portion of the propeller will not
contact the motor. If motor make has a short shaft, it
may be necessary to position bushing slightly beyond
end of shaft.
6. Slide the propeller forward onto the taper-lock bushing
and turn the capscrews in by hand as far as possible.
7. Use an INCH-POUNDS torque wrench and GRADU-
ALLY TIGHTEN the capscrews (1/4 turn at a time) until
the taper bushing becomes fully seated. Refer to the
following chart for the recommended capscrew tighten-
ing torques. Do not excessively overtighten the bush-
ing. See Fig. 7-6 and CAUTION ahead.
8. Turn propeller by hand and check it for freedom of rota-
tion and uniform tip clearance before reinstalling the
fan guard.
CAUTION: Do not attempt to pull the flange of the
bushing flush with the propeller hub. A clearance of
from 1/8" to 7/32" must be maintained between bush-
ing flange and propeller hub surface. See Fig. 7-7.
FAN MOTOR REMOVAL AND
INSTALLATION
In the event of a motor failure, remove the motor, as
described, and take it to the nearest authorized service
station.
Authorized service stations are the only
places that can provide possible motor warranty.
Motor service and repair at other places will be at
owner’s expense.
If service station determines motor failure to be caused
by faulty material or workmanship, repair will be under
warranty when it is within the warranty period. Motor
failure because of external causes will result in a
charge to the owner for repair.
1. Make certain power is shut off and locked out, then
remove fan guard and propeller, as outlined earlier.
2. Remove cover from fan-heater control box and discon-
nect the motor lead wires from within the box.
NOTE: Tag or otherwise identify wires for ease of
reassembly.
3. Remove motor mount bolts. If there are any shims
between the motor and its base, note their location so
they can be properly installed during reassembly.
4. Disconnect the upper end of the motor conduit, if
required, then carefully pull conduit and wires through
hole in fan-heater housing.
Remove motor with conduit still attached from fan-
heater unit. If motor requires service, take it to an
authorized service station. The motor is heavy. Use
suitable lifting equipment and/or additional assistance.
5. To re-install motor, slide onto motor base plate and
replace shims (if required) between motor and base
plate. Re-install motor mount bolts and washers, but
do not fully tighten them at this time. Re-install conduit
and wires through hole in fan-heater housing and care-
fully remake all electrical wiring connections.
Check and adjust position of motor by TEMPORARILY
mounting fan blade on motor shaft, and rotate it by
hand, making the necessary adjustments so that the tip
clearance between blade and housing is uniform.
Remove the fan blade after obtaining proper tip clear-
ance, and fully tighten all motor mounting bolts.
47
A clearance of 1/8" to 7/32"
should be maintained between
bushing flange and propeller
hub surface.
BUSHING.DS4
Fig. 7-7 Ensuring the necessary hub to flange clearance
BROWNING TAPER-LOCK BUSHING
BOLT TIGHTENING TORQUES
Bushing Size Bolt Dia. Torque (inch/lbs.)
H 1/4" 95 in-lbs
P 5/16" 192 in-lbs
Q 3/8" 348 in-lbs