MK Plastics KVC IO&M - Manual (Page 3)

M.K.Plastics Corp. Montréal, Québec www.mkplastics.com 3
FASTENER
QD
IN IRON IN ALUM. HUB FOR DRIVE
#10 - - - - - 5
0.250-20 5.5 8 12 7.9 7.5 9
0.312-18 11 7 25 16 13 15
0.375-16 22 30 45 29 24 30
0.437-14 30 50 70 - - -
0.500-13 55 75 110 70 - 60
0.562-12 - - - - - 75
0.625-11 100 150 220 - - 135
0.750-10 170 270 380 - - -
0.875-9 165 430 600 - - -
1-8 250 645 900 - - -
1.25-7 500 1120 1500 - - -
Tolerance: +5%
For wheel setscrews use Grade 2 values.
The above torque values are for no lubricated fasteners.
BROWNING SPLIT
TAPER BUSHINGS
SIZE
GRADE 2 GRADE 5 GRADE 8
Table-1. Tightening Torque (Ft.-Lbs)
Motor Support Adjustment
Two different types of motor mounts, post and saddle, are used on Axijet-V & KVC fans. Which mount to
use depends on the size of the fan and motor.
On the post type motor mount, the motor plate is supported on four threaded rods. Belt tension is
adjusted by loosening the four nuts on top of the motor plate and raising the motor plate by adjusting the
four nuts underneath it. The top nuts should then be tightened to hold the motor plate in place.
On the saddle type motor mount, the motor pivots on one side and adjustment of belt tension is achieved
by loosening the nuts on top of the motor plate on the other side, then raising the motor plate by adjusting
the nuts underneath the motor plate. The nuts on top of the motor plate should again be tightened to hold
the motor plate in place. Several holes are provided on the pivot side, and the pivot point can be raised
for gross belt adjustment. If this adjustment is made, however, the motor plate should be as parallel as
possible to the fan center plane. Care should be taken to maintain drive alignment and proper belt
tension.
Bearing Maintenance
Proper lubrication of the fan drive bearings helps assure maximum bearing life. All fans are equipped with
decals indicating relubrication intervals for normal operating conditions. See Table 2A, 2B and 2C for
typical lubrication data. However, every installation is different and the frequency of relubrication should
be adjusted accordingly.
Observation of the conditions of the grease expelled from the bearings at the time of relubrication is the
best guide as to whether regreasing intervals and amount of grease added should be altered.
Greases are made with different bases. There are synthetic base greases, lithium base, sodium base,
etc. Avoid mixing greases with different bases. They could be incompatible and result in rapid
deterioration or breakdown of the grease. The lubrication sticker identifies a list of acceptable lubricants.
All bearings are filled with a lithium-based grease before leaving the factory. When the fans are started,
the bearings may discharge excess grease through the seals for a short period of time. Do not replace
the initial discharge because leakage will cease when the excess grease has worked out. Sometimes the
bearings have a tendency to run hotter during this period. There is no reason for alarm unless it lasts over
48 hours or gets very hot (over 200°F). When relubricating, use a sufficient amount of grease to purge the
seals. Rotate bearings by hand during relubrication.