A DJ & DG MANUAL
27 of 34 May 12 R2
m CAUTION: Excessive belt tension is the most frequent cause of belt wear, bearing wear and noise.
SET SCREWS
Check set screws on fan wheel, fan bearings, fan and motor pulleys for looseness on the shaft. Tighten
where required. IT IS IMPORTANT TO PERFORM THIS CHECK BEFORE INITIAL START-UP, AFTER A
RUN-IN PERIOD OF 2 WEEKS AND THEN ON 4 MONTH INTERVALS.
m CAUTION: OVERTIGHTENING SET SCREWS CAN DAMAGE BEARINGS.
BEARING SETSCREW TORQUES
Shaft diameter
NTN KOYO NTN KOYO DODGE
Type
UC SERIES
(set screw)
UK SERIES
(adapter sleeve locknut)
SC 203-215 SERIES
3/4" (19mm) 35 in-lb (3.9 Nm) 35 in-lb (4.0 Nm) 66 - 80 in-lb (7.5 - 9 Nm)
1" (25mm) 35 in-lb (3.9 Nm) 35 in-lb (4.0 Nm) 126 - 156 in-lb (14 -18 Nm)
1 3/16" (30mm) 43 in-lb (4.9 Nm) 35 in-lb (4.0 Nm) 126 - 156 in-lb (14 -18 Nm)
1 7/16" (37mm) 51 in-lb (5.8 Nm) 75 in-lb (8.5 Nm) 126 - 156 in-lb (14 -18 Nm)
1 11/16"(43mm) 69 in-lb (7.8 Nm) 75 in-lb (8.5 Nm) 228 - 272 in-lb (26 -31 Nm)
1 15/16"(49mm) 69 in-lb (7.8 Nm) 155 in-lb (17.5 Nm) 228 - 272 in-lb (26 -31 Nm)
2 3/16"(56mm) 87 in-lb (9.8 Nm) 155 in-lb (17.5 Nm) 228 - 272 in-lb (26 -31 Nm)
2 7/16"(62mm) 147 in-lb (16.6 Nm) 155 in-lb (17.5 Nm) 228 - 272 in-lb (26 -31 Nm)
2 11/16"(68mm) 173 in-lb (19.6 Nm) 248 in-lb (28.0 Nm) 228 - 272 in-lb (26 -31 Nm)
2 15/16"(75mm) 173 in-lb (19.6 Nm) 248 in-lb (28.0 Nm)
Install the washer and lock nut;
tighten the nut fully by hand.
Apply a punch or screw driver
into the notch of the nut and
tap it with a hammer. Stop
tapping after the nut has turned
60° to 90°.
Do not strike the seal.
Bend the tab on the rim of the
washer, which is in line with the
notch of the nut.
If a tab does no line up with a
notch, tighten the nut further.
DO NOT BACK THE NUT
OFF.
228 - 272 in-lb (26 -31 Nm)
Refer to bearing manufacturers’ literature for all other types of bearings.
LUBRICATION OF FAN BEARINGS
Some fans have permanently lubricated sealed ball bearings which should not require lubrication. These
bearings are factory packed 30 to 50% full. Bearings that require lubrication should be greased while
the bearing is rotating slowly, with the following quantities of a lithium base lubricant. DO NOT
OVERGREASE. DO NOT USE NON-LITHIUM BASED GREASE.
Extended lubrication lines may be provided. Tubing is not factory filled.
RECOMMENDATIONS FOR BALL BEARINGS
Re-Greasing Interval
Bearing Temperature
° F (°C)
Clean Dusty Dusty & Wet
Under 120 (50)
2 ½ Years Yearly 4 Months
Under 158 (70)
Yearly 4 Months 1 Month
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