Three-Stage Mast Assembly
4000 SRM 482
Three-Stage Mast Assembly
THREE-STAGE MAST ASSEMBLY,
REMOVE
Read and follow the Safety Procedures When Work-
ing Near Mast, as well as all WARNINGS and CAU-
TIONS. See Figure 18 and Figure 19.
NOTE:
If the mast assembly will be disassembled
after it is removed from the truck, first remove the
standard carriage, the reach carriage, or the attach-
ment carriage as a complete assembly. See Carriage
Assembly, Remove and Install. If the reach carriage
will be removed with the mast assembly, operate
the REACH/RETRACT control button to retract the
forks fully. Install safety chains so the forks cannot
extend. Install the safety chains around the center
plates of the scissor arm weldment and a crossmem-
ber of the mast. Make sure a safety chain does not
touch the mount for the hose sheave, lift chains,
chain or hose sheaves, hoses, tubes, or fittings. If
installed, operate the SIDESHIFT control button to
move the sideshift frame to the center position.
NOTE:
For mast removal on the N30XMH, refer to
the procedure for N30XMH Only.
1.
Remove the capscrews and nuts that fasten the
mast operator guard and remove the guard. See
Figure 8 or Figure 9.
2.
Remove the capscrews that fasten the rear legs to
the overhead guard. See Figure 8. The overhead
guard will be removed with the mast assembly.
CAUTION
Do NOT move the control button for the reach,
retract, tilt, or sideshift functions. Oil will flow
from the hoses for these functions.
3.
Operate the LIFT/LOWER control to raise the
inner weldment high enough to remove the four
capscrews, shims, and nutplates that fasten the
bottom of the mast to the truck frame. See Fig-
ure 10.
4.
Install safety chains to keep the mast compo-
nents from moving.
Remove the capscrews,
washers, and clamps that fasten the lift cylinder
hoses to the mast weldments. Do NOT discon-
nect any hydraulic fittings.
5.
Remove the safety chains installed in Step 4. Do
not damage hydraulic hoses as the mast lowers.
Carefully operate the LIFT/LOWER control to
lower the inner weldment fully. Make sure all
hydraulic pressure is removed from the system.
6.
Mark the trunnion caps so they can be reassem-
bled in the same position and on the same trun-
nion from which they are removed. Use chains
to connect a crane or other lifting device to the
top of the mast assembly. Make sure the chains
will not damage the sheaves or other parts of the
mast assembly. Make sure the chains and crane
have the capacity to lift approximately 2000 kg
(4409 lb).
Use safety chains to fasten all the
mast weldments together so they cannot move.
If installed, install a chain or sling to the reach
carriage to keep the mast assembly from tipping
during removal. Remove the four capscrews that
fasten the trunnion caps.
7.
Operate the crane until it gives support to the
weight of the mast assembly. Move the crane to
a position so that the mast assembly will be lifted
vertically. Raise the mast assembly high enough
to clear the trunnions. Move the mast assembly
approximately 30 cm (1 ft) away from the truck
for access to the hoses.
22
Summary of Contents for MAST N30XMH
Page 14: ...Two Stage Mast Assembly 4000 SRM 482 Figure 10 Two Stage Mast Assembly Dual Lift Cylinders 10 ...
Page 27: ...4000 SRM 482 Three Stage Mast Assembly Figure 18 Three Stage Mast Assembly 23 ...
Page 34: ...Three Stage Mast Assembly 4000 SRM 482 Figure 21 Hose and Cable Assemblies Outer Weldment 30 ...
Page 51: ......
