Radiator Fan Bolt Retorque - Kohler 20-2250 kW Operation

13. Maintain the coolant level in the coolant recovery
tank between the high and low marks.
Note: Air pockets often form in the engine water
jacket when the coolant system is refilled.
Check the coolant level in the coolant
recovery tank after each generator set
operation and add coolant as necessary
until the coolant level stabilizes. Then check
the coolant at the interval specified in the
service schedule.
14. Reenergize the block heater, if equipped.

3.8 Radiator Fan Bolt Retorque

Adapted from Service Bulletin SB-683 12/07a.
The radiator fan bolts must be initially checked after
approximately 8 hours of operation and then rechecked
after each 100 hours of operation. This scheduled
service is required on all 1500--2800REOZDC unit-
mounted radiator models using a 2743 mm (108 in.)
diameter fan.
Perform the scheduled service steps in the order shown.
Required Tools
D
Socket wrench sets American Standard and Metric
sizes
D
Torque wrench, up to 203 Nm (150 ft. lb.)
Procedure
1. Place the generator set master switch in the OFF/
RESET position.
2. Disconnect the power to the battery charger, if
equipped.
3. Disconnect the generator set engine starting
battery(ies), negative (--) lead first.
4. Remove the fan guards, screens, and covers as
necessary to access the radiator fan hardware.
5. Inspect the blades for cracks or other damage.
Verify that all hardware is present. Replace as
needed.
6. Retorque the (32 qty.) blade retention bolts/nuts to
136 Nm (100 ft. lb.). See Figure 3-8.
7. Retorque the (12 qty.) hub boss cap screws to
102 Nm (75 ft. lb.). There are six screws on each
side of the fan.
30 Section 3 Scheduled Maintenance
5
SECTION A-- A
5. (32) blade retention bolts/nuts, 136 Nm (100 ft. lb.)
6. (12) hub boss cap screws, 102 Nm (75 ft. lb.)
7. (3) bushing cap screws, 43 Nm (32 ft. lb.)
Figure 3-8 Fan Hardware Location and Torque
8. Retorque the (3 qty.) bushing cap screws to 43 Nm
(32 ft. lb.).
9. Replace the fan guards, screens, and covers that
were removed to access the radiator fan hardware.
10. Check that the generator set master switch is in the
OFF position.
11. Reconnect the generator set engine starting
battery, negative (--) lead last.
12. Reconnect power to the battery charger, if
equipped.
13. Place the generator set master switch to the RUN
position to start the generator set. Refer to the
respective generator set operation manual as
needed.
14. Listen and observe the fan operation.
15. Immediately shut down the generator set if
abnormal noise or fan assembly vibration is
observed. Correct the problem and go back to
step 13.
16. After several minutes of generator set operation
without abnormal noise or vibration, shut down the
generator set by placing the generator set master
switch to the OFF/RESET position.
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GM18401-J
TP-6161 1/12