MCi Crusader II 1989 Maintenance Manual page 29

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MC-9 MAINTENANCE MANUAL
Figure 2-1. Drive Axle
REAR AXLES
DRIVE AXLE
The drive axle (figure 2-1) is a Rockwell Standard full floating
type with pressed steel housing, fitted with replaceable pressed
in steel sleeves. A magnetic drain plug is installed in the bottom
of the housing.
The single reduction final drive employs a heavy duty hypoid
drive pinion and ring gear. The differential and gear assembly is
mounted on tapered roller bearings and lubricated by the dif-
ferential oil.
The straddle-mounted pinion has two tapered roller bear-
ings in front of the pinion teeth which take the forward and
reverse thrust and a third bearing behind the pinion teeth to
carry the radial load.
The standard drive axle ratio on all of the coach models is
3.73:1. Optional ratios which may be present are 3.33:1 and
4.10:1 ..
LUBRICATION
Lubrication recommendations will be found in Section 10 of
this manual.
·ouring initial stages of normal operation. tiny metal particles
are freed from mating surfaces of moving parts. These metal
particles are carried by the lubricant through the assembly and
act as lapping compound which accelerates wear of all parts.
To ensure maximum life of the differential and prevent pre-
mature failure, the original "factory fill" lubricant should be
drained. This also prevents lubricant contamination caused by
differences in the "factory fill" and lubricant used by the oper-
ator when topping up.
CAUTION: Change break-in oil after 1,000
miles (1,600 km) but no later than 3,000
miles (4,800 km). Drain the unit while still
warm from operation.
See figure
2-2
for fill and drain plugs. Magnetic drain plugs
perform the vital function of trapping small metallic particles
that circulate in the lubricant. through the gears and bearings.
They prevent rapid wear and premature failure. The magnet
must be strong enough to firmly hold the particles under service
conditions. We recommend plugs with elements having a min-
imum pick-up capacity of 2 pounds of low carbon steel in plate
or flat bar form.