Section 11: REAR AXLES
PA1553
8
1. Shortening of wheelbase, thus allowing tighter
turning in tight maneuvering areas such as
parking lots or when making a sharp turn.
2. Transferring extra weight and additional
traction to the drive wheels on slippery
surfaces.
CAUTION
Do not use tag axle in raised position for an
extended period. Raising tag axle increases
load on the drive axle, suspension and tires.
Do not drive vehicle with tag axle raised when
speed is exceeding 9mph (15 km/h).
In order to prevent damage to the suspension,
always raise the tag axle before lifting the
coach.
The tag axle service brakes operate only when
the axle is in normal driving (loaded) position.
2.2 RETRACTING TAG AXLE FOR REPAIR
PURPOSES
• Connect an external air pressure line to the
emergency fill valve in the engine
compartment.
• Lift the axle by pushing the lever forward.
WARNING
Install a protective cover to prevent unfortunate
lever operation while work is being carried out
under the vehicle.
• Raise the vehicle using the lifts.
WARNING
Lift manufacturers recommend lowering the
vehicle to the ground or installing some safety
stands before activating the suspension to
prevent the lifts from becoming unstable.
• For added safety, install nylon slings over
tag axle shock absorbers.
2.3 GREASE LUBRICATED WHEEL
BEARINGS
The unitized hub bearings used on the NDS
range of axles, are non-serviceable items.
Bearings are pre-adjusted, lubricated and have
seals fitted as part of the manufacturing process.
The bearings are greased for life and there is no
need or facility for re-lubrication
Front and tag axle wheel hub bearings need to
be checked every 30,000 miles (48 000 km).
NOTE
For more information on front and tag axle
wheel hubs, refer to “DANA SPICER
Maintenance Manual Model NDS and
Maintenance Manual NDS Axles” annexed at
the end of this Section.
2.4 REMOVAL AND INSTALLATION
2.4.1 Removing Tag Axle Only
The following procedure deals with the removal
of the tag axle while keeping the air springs
installed. The method used to support the axle
and suspension components during removal
and disassembly depends upon local conditions
and available equipment.
• Connect an external air pressure line to the
emergency fill valve in the engine
compartment.
• Lift the axle by pushing the lever forward.
WARNING
Install a protective cover to prevent unfortunate
lever operation while work is being carried out
under the vehicle.
• Disconnect tag axle air springs pneumatic
hoses and install valves or plugs.
• Raise the vehicle using the lifts.
• Dismount tag axle components.
Before reinstalling air spring hoses, make sure
there is no pressure left inside by opening the
valves or unloading tag axle.
2.4.2 Removing Tag Axle Along With
Suspension Components
The following procedure deals with the removal
of the tag axle assembly along with the
suspension components. The method used to
support the axle and suspension components
during removal and disassembly depends upon
local conditions and available equipment.
1. Raise vehicle by its jacking points on the
body (fig. 5 or see Section 18, "Body" under
heading: "Vehicle Jacking Points"). Place jack
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