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Section 3 Scheduled Maintenance
3.9 Radiator Fan Bearing
Lubrication
The following procedure applies only to 1200--2250 kW
generator sets. Lubricate the radiator fan shaft and idler
shaft bearings at every engine oil change to avoid
bearing damage.
Lubricate the bearings every
200 hours of operation when the generator set runs in
ambient temperatures below 29
°
C (85
°
F) or when the
generator set runs in a dusty and/or humid environment.
Lubrication and Drive Belt Adjustment Procedure
Lubricate the fan shaft and idler shaft bearings with a
lithium-complex
base,
multi-purpose
grease
with
antirust, antifoam, and extreme-pressure additives
having a minimum dropping point of 204
°
C (400
°
F).
Use Mobil Mobilith AW2 NLGI Grade 2 or equivalent.
1. Place the generator set master switch in the
OFF/RESET position.
2. Disconnect the generator set engine starting
battery(ies), negative (--) lead first, and disconnect
power to the battery charger.
3. Remove the belt guards to expose the fan shaft and
idler shaft bearings.
4. Inject grease into the two bearings on the fan shaft
block and the two bearings on the idler shaft block
using a grease gun until a 3--6 mm (0.13--0.25 in.)
grease column shows at the bearing pressure relief
port. See Figure 3-10.
Note:
The fan shaft and idler shaft bearings have
pressure relief ports to prevent bearing
damage caused by overlubrication.
5. Remove excess grease from the bearing pressure
relief ports.
6. Inspect the fan drive belt and replace if it is damaged
or worn. Check the fan belt tension using a poly
V-belt tension gauge and adjust the tension, if
necessary. See Figure 3-9.
Generator Set Model
New Belt,
N (lbf.)
Used Belt,
*
N (lbf.)
1200-2000 kW
2450--2890
(550--650)
1650--1910
(370--430)
* A belt is considered used after 50 hours of service.
Figure 3-9
Poly V-Belt Tension Specifications
7. Reinstall the belt guards using the original
hardware.
8. Reconnect the generator set engine starting
battery(ies), negative (--) lead last.
1
2
TP-5353-3
3
1
2
5
4
1. Grease fittings
2. Pressure relief port
3. Radiator assembly
4. Idler shaft grease fittings
5. Fan shaft grease fittings
Figure 3-10
Radiator Fan Bearings and Pressure
Relief Ports, Typical
9. Test run the generator set for a few minutes and
listen for belt noise (squeal) indicating a slipping
belt. Stop the generator set.
If the belt slips after the belt tension procedure, clean the
pulley surfaces and repeat the belt tension procedure. If
slippage continues, replace the fan belt.
3.10 Battery
Sulfuric acid in batteries.
Can cause severe injury or death.
Wear
protective
goggles
and
clothing.
Battery acid may cause
blindness and burn skin.
WARNING
Summary of Contents for 1250-2250 kW
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