4000 SRM 482
Three-Stage Mast Assembly
Main-Lift Chains
1.
Raise the mast until the lower chain anchors are
visible on the inner weldment.
2.
Use safety chains to fasten the inner weldment so
that it cannot move. Operate the LOWER control
to lower the masts until the safety chains are a
support for the inner weldment and lift chains do
not have tension.
NOTE:
Removing the pins at the chain anchors
will disconnect the lift chains without changing the
chain adjustment. Always adjust the chains if new
lift chains or other components are installed.
3.
Fasten both main-lift chains so they cannot move
over the sheaves. Remove the chain anchor pins
at each end of both main-lift chains. Hold each
chain to keep it from moving too fast and care-
fully remove them.
4.
Inspect the main-lift chains as described in Lift
Chains Check. Replace the main-lift chains if
necessary.
5.
Reverse the procedure to install the main-lift
chains.
6.
Adjust the main-lift chains as described in Adjust
Main-Lift Chains.
THREE-STAGE CHAIN SHEAVES,
DISASSEMBLE AND ASSEMBLE
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.
Free-Lift Chain Sheaves
1.
If necessary, remove the free-lift chains as de-
scribed in Three-Stage Lift Chains, Remove and
Install.
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.
2.
Remove the snap ring from the shaft in the
sheave support.
3.
Use a drift to tap the shaft out of the sheave sup-
port.
4.
Remove the sheaves and spacers as a group. In-
spect all components for wear or damage. Re-
place any part that is worn or damaged.
5.
Reverse the procedure to install the chain
sheaves.
Main-Lift Chain Sheaves
1.
If necessary, remove the main-lift chains as de-
scribed in Three-Stage Lift Chains, Remove and
Install.
2.
Remove both pins from the chain anchors at the
rear of the free-lift cylinder. Remove each lift
chain from the sheaves.
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.
3.
Remove the snap ring from the chain sheave
bracket.
4.
Use a pry bar to remove the chain sheave from
the bracket. Inspect all components for wear or
damage. Replace any item that is worn or dam-
aged.
5.
Reverse the procedure to install the chain
sheaves.
33
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: ......
