4000 SRM 482
Two-Stage Mast Assembly
Remove and Install
1.
Operate the LIFT/LOWER control to raise the
carriage so that the forks are approximately
150 mm (6 in.) off the floor. Use safety chains
to fasten the carriage to the outer weldment so
that it cannot move.
2.
Lower the carriage so the safety chains are the
support for the carriage and the lift chains do not
have tension.
WARNING
Keep control of the lift chains when discon-
necting them from the chain anchor.
This
procedure will prevent the lift chains from
falling and causing an injury or damage.
3.
Remove the cotter pins that fasten the chain an-
chor pins. Remove the chain anchor pins. Re-
move the lift chains.
WARNING
Never replace only the worn section of a lift
chain. Replace the complete chain. Never re-
place only one chain of a chain pair. Replace
both chains.
4.
Clean and inspect the lift chains. See Lift Chains
Check, Clean and Inspect. Replace the lift chains
if necessary.
5.
To install the lift chains, reverse the removal pro-
cedure.
6.
Adjust and test the lift chains for correct opera-
tion as described in Lift Chains Check.
Clean and Inspect
Clean and inspect the lift chains as described in Lift
Chains Check. See Figure 23.
TWO-STAGE CHAIN SHEAVE, REMOVE
AND INSTALL
Read and follow the Safety Procedures When Work-
ing Near Mast, as well as all WARNINGS and CAU-
TIONS.
1.
Operate the LIFT/LOWER control to raise the
carriage so the forks are approximately 150 mm
(6 in.) off the floor. See Figure 16. Use safety
chains to fasten the carriage to the outer weld-
ment so it cannot move.
2.
Lower the carriage so the safety chains are the
support for the carriage and the lift chains do not
have tension.
WARNING
Keep control of the lift chains when discon-
necting them from the chain anchor.
This
procedure will prevent the lift chains from
falling and causing an injury or damage.
3.
Remove the cotter pin from the pin that fastens
the lift chain to the chain anchor near the top of
the outer weldment. Remove the anchor pins.
4.
Put the lift chains over the carriage.
WARNING
Be careful when removing or installing snap
rings.
These snap rings are large and can
come loose during removal or installation with
enough force to cause an injury. Always use
the correct snap ring pliers and wear eye and
face protection during removal or installation.
5.
Remove the snap ring from the sheave mounting
stud.
6.
Use a pry bar to remove the sheave from the stud.
7.
Remove the internal snap ring from the chain
sheave.
8.
Inspect all parts for wear or damage. Replace
any worn or damaged parts.
9.
If necessary, use a press to remove and install
new ball bearings in the sheaves for the lift
chains.
10. Reverse the procedure to install the chain
sheaves.
11. Operate the truck and test for correct operation
of the chain sheave.
19
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: ......
