• Lubriplate Syn Flush
• Lubriplate Pure Flush
• Whitmore’s Flushing Oil
• Medallion
™
Flushing Oil Kosher
6. Using degreaser, clean the thread on the drain
hole and drain plug.
7. Install the drain plug.
8. Fill the fan drive gearbox with Mobil® Delvac
75W–90 lubricant until the lubricant starts to
come out of the oil level plug hole.
9. Using degreaser, clean the thread on the oil level
and fill holes and both plugs.
10. Install the plugs, making certain that the
breather/fill plug is used in the fill plug hole.
20–05 Mechanical Fan Drive
Gearbox Lubrication
U-Joint Lubrication
1. Wipe all old grease and dirt from each U-joint
grease fitting.
2. Use a hand-type grease gun, or a high-pressure
gun with a low-pressure adaptor, to lubricate the
U-joints. See
Fig. 3.
NOTE: If a low-pressure adaptor is not used
with the high-pressure gun, the U-joints may not
receive enough lubricant.
3. Using lithium 12-hydroxy stearate grease (NLGI
grade 2, with EP additives and meeting ASTM
D4950 LB specifications), lubricate until new
grease can be seen at both U-joint seals.
NOTICE
Fresh lubricant must be seen escaping from both
of the bearing cup seals of each U-joint. If not, the
U-joint may fail prematurely.
4. If the bearing will not take grease, replace the
U-joint assembly.
5. Check the old grease. If it appears rusty, gritty, or
burned, replace the U-joint assembly.
6. Wipe any excess grease from the seals and
grease fittings.
Slip-Joint Spline Lubrication
1. Check the slip-joints for spline wear by trying to
bend the sleeve-yoke and splined shaft back and
forth. If looseness is greater than 0.007 inch
(0.18 mm), replace both the sleeve-yoke and the
splined shaft.
2. Wipe all old grease and dirt from the slip-joint
grease fitting.
3. Use a hand-type grease gun or a high-pressure
gun with a low-pressure adaptor, to lubricate the
slip-joint. See
Fig. 3. Using lithium 12-hydroxy
stearate grease (NLGI grade 2, with EP additives
and meeting ASTM D4950 LB specifications),
lubricate until fresh grease appears at the
pressure-relief hole in the yoke plug. Then cover
the relief hole with your finger, while continuing
to lubricate until fresh grease appears at the slip-
joint seal. This ensures complete lubrication of
the splines.
4. Wipe any excess grease from the pressure-relief
hole, slip-joint seal, and grease fitting.
08/31/2011
1
2
3
4
5
f200744
1. Pinion Shaft
2. Breather/Fill Plug
3. Oil Level Plug
4. Drain Plug
5. Cross-Shaft
Fig. 2, Mechanical Fan Drive Gearbox
Engine Cooling/Radiator 20
Recreational Vehicle Chassis Maintenance Manual, October 2016 20/3
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