Mast Adjustments
4000 SRM 482
5.
Check chain tension by pushing on both chains
at the same time. If the tension is not the same,
adjust the nuts on the chain anchors until the
tension is the same and the distance (Step 1) is
also correct. Tighten the lock nuts.
NOTE:
When the chain adjustments are complete,
make sure the cotter pin at the bottom of the chain
anchor can be installed under the adjustment nut. If
there is no room to install the cotter pin, the chains
are too short. Install the correct chains. Make sure
the lock nuts on the chain anchors are tight against
the mount plate. If there are not enough threads on
the chain anchor for correct adjustment, new chains
are too long or old chains are too worn. Links can be
removed from old chains if the chains are less than 3
percent longer than the correct new chain. Replace
old chains that are too long or new chains that are
not the correct length.
6.
Tighten the chain anchor jam nuts.
7.
Check the mast operation as described in Mast
Operation Check.
8.
Install the mast operator guard if removed.
Three-Stage
1.
Adjust the main-lift chains for equal tension.
2.
Check chain tension by pushing on both main-
lift chains at the same time. If the tension is
not the same, remove the mast operator guard
if installed. See Figure 8. Loosen both lock nuts
at the chain anchors to make any adjustments.
3.
Adjust the nuts on the chain anchors until the
tension is the same. Tighten the lock nuts.
4.
Check the mast operation as described in Mast
Operation Check.
5.
Install the mast operator guard (if removed).
ADJUST WEAR STRIPS
NOTE:
The wear plugs and lift chains must be ad-
justed before the wear strips are checked for wear,
replaced, and adjusted.
The wear strips and shims are fastened to the lower
guide blocks of weldments that move. See Figure 27.
The wear strips and shims are adjusted:
• For minimum clearance to prevent too much side
movement of the weldments.
• To keep the weldments parallel.
NOTE:
WEAR STRIPS AND SHIMS ON THE THREE-
STAGE INNER WELDMENT CAN BE USED ON EI-
THER SIDE. THERE ARE RIGHT AND LEFT WEAR
STRIPS AND SHIMS ON TWO-STAGE INNER AND
THE THREE-STAGE INTERMEDIATE WELDMENTS.
1.
CAPSCREW
2.
WASHER
3.
WEAR STRIP
4.
SHIM
5.
WELDMENT
CHANNEL
Figure 27. Typical Wear Strip Assembly
NOTE:
Wear strips and shims on the three-stage in-
ner weldment can be used on either side. There are
right and left wear strips and shims on the two-stage
inner and the three-stage intermediate weldments.
See Figure 10 and Figure 27.
Check and adjust the wear strips as follows:
1.
If installed, remove the mast operator guard. See
Figure 8. Raise the carriage for access to the
wear strips. Install safety chains as described in
Safety Procedures When Working Near Mast.
2.
Remove the capscrews, washers, wear strips, and
shims. Replace all worn or damaged parts. One
wear strip and one shim on each side is usually
the correct adjustment. There must be the same
number of shims under the wear strip on both
42
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: ......
