Retracting Tag Axle; Retracting Tag Axle For Repair Purposes; Tag Axle Wheel Bearings; Removal And Reinstallation - PREVOST H3-41 Maintenance Manual

SECTION 11: REAR AXLES
4.2

RETRACTING TAG AXLE

The standard tag axle retraction system is
controlled by a valve located on the right lateral
console and enables unloading and raising the
tag axle (refer to the "OPERATOR'S MANUAL"
for location of controls).
MAINTENANCE
Tag axle lever pivot
Grease one fitting on each pivot (2 pivots) at
the intervals specified by the Lubrication And
Servicing Schedule
LUBRICATION & SERVICING.
4.3 RETRACTING TAG AXLE FOR REPAIR
PURPOSES
 Connect an external air pressure line to the
emergency fill valve
compartment.
 Lift the tag axle by pushing the lever forward.
WARNING
Install a protective
unfortunate lever operation while work is being
carried out under the vehicle.
 Raise the vehicle using the lifts.
WARNING
Lift manufacturers recommended 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 sling over tag
axle shock absorbers to retain tag axle in
case of air leak.
4.4

TAG AXLE WHEEL BEARINGS

The unitized hub bearings used on the tag axle
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.
18
PA1621 Maintenance Manual All Series | January 2017
in Section 24:
in the engine
cover to prevent
MAINTENANCE
Front and tag axle hub bearings need to be
checked at the intervals specified by the
Lubrication And Servicing Schedule in Section
24: LUBRICATION & SERVICING.
4.5

REMOVAL AND REINSTALLATION

4.5.1

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.
1. Connect an external air pressure line to the
emergency fill
compartment.
2. 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.
3. Disconnect tag axle air springs pneumatic
hoses and install valves or plugs.
4. Raise the vehicle using the lifts.
5. Dismount tag axle components.
6. Before reinstalling air spring hoses, make
sure there is no pressure left inside by
opening the valves or unloading tag axle.
4.5.2 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
(Figure 5) or see Section 18, "Body" under
heading: "Vehicle Jacking Points"). Place jack
under frame.
valve in the engine