323
M7.0-1055-003
02 Rev. 5/08
LIFTING MECHANISM
Mast
Mast Disassembly
Wear appropriate items, such as safety glasses and
steel-toed shoes whenever performing maintenance
work. Do not place fingers, hands or arms through
mast or position them at pinch points.
In this section you may be required to lift and block the
truck and mast or raise and lower different components
for removal and installation. Make sure lifting device
and sling are sufficiently rated to withstand the weight
being lifted. Never work under or around a truck that is
not properly secured. Refer to truck Data Plate for truck
weight information.
It will be necessary to disconnect and remove the bat-
tery from the truck, disconnect tilt cylinders from the
mast, disconnect electrical connections and hydraulic
lines. "Control of Hazardous Energy" section provides
information for performing the above procedures along
with some additional information on other procedures
dealing with truck maintenance. This section should be
read and reviewed prior to mast removal, installation
and maintenance as outlined in this section.
The following steps cover the disassembly of the TT
mast.
1. Remove load backrest. Raise carriage and remove
forks. Lower mast cylinders completely.
2. Disconnect and remove battery.
3. Cycle sideshift and accessory levers a few times to
assure hydraulic pressure is relieved from system.
4. Connect a lifting device to the carriage and raise
carriage assembly to get slack in the lift chains and
any accessory hydraulic hoses. Disconnect chains
and any hydraulic lines from back of the carriage.
5. Remove yoke assemblies form the top of the car-
riage cylinder.
6. Lower carriage completely and connect a lifting de-
vice to the top crossbrace of the inner mast. Raise
mast until the carriage can be pulled forward and
out of the mast.
7. Disconnect hydraulic line at the bottom of the car-
riage cylinder. Remove the two screws securing
the bottom of the carriage cylinder to the inner
mast.
8. While stabilizing the carriage cylinder, remove the
U-bolt assembly that connects the carriage cylin-
der to the middle crossbrace. Move the carriage
cylinder to a clean work area if carriage cylinder
disassembly is required.
9. Remove stop bolt on the inner mast. Remove ac-
cessory hose guide if so equipped, at the bottom of
inner mast.
Figure 16948
Crown 2007 PF15690-3 Rev. 5/08
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