WARNING
Use a lifting device to move mast weldments to
prevent serious injury. Each mast weldment
weighs approximately 68 kg (150 lb).
7.
Using a lifting device, lift second intermediate
mast weldment and slide it through mast slider
blocks on top of first intermediate mast weld-
ment to the position shown in Figure 13. This
provides access to chain sheave stubshafts.
8.
Install two chain sheaves and snap rings onto
stubshafts of first intermediate mast weldment.
See Figure 11.
9.
Install two lift chains, with a length of
1924.05 mm (75 3/4 in.), to two chains anchors
to top of first intermediate mast weldment us-
ing two chain anchor pins and two cotter pins.
See Figure 8.
10.
Install lift chains to chain anchor mounts on
the bottom of second intermediate mast weld-
ment using chain anchor pins and cotter pins.
See Figure 8.
11.
Route lift chains over upper chain sheaves on
first intermediate mast weldment and let them
hang below the assembly.
12.
Collapse the mast weldments so that the sec-
ond intermediate mast weldment is flush with
the first intermediate mast weldment.
NOTE:
Do not adjust setscrews at this moment.
Start the thread and do not apply pressure to mast
slider block.
NOTE:
Apply Loctite® Blue 242 Threadlocker to
setscrew threads prior to installation.
13.
Install four setscrews (two on each slider block)
on the inside mast slider block on the top of
first intermediate mast weldment. See Fig-
ure 9.
14.
Loosen self-tapping screws and tighten set-
screws to close gap between the mast slider
block and edge of channel on second intermedi-
ate mast weldment.
15.
Tighten both self-tapping and setscrews to
2.1 N•m (18.6 lbf in) and ensure a gap of 0.50
to 4.0 mm (0.02 to 0.16 in.) is achieved. See Fig-
ure 14.
NOTE:
FIRST AND SECOND INTERMEDIATE
MAST WELDMENTS SHOWN. POSITION IS SIMI-
LAR FOR THIRD AND FOURTH MAST WELDMENT
ASSEMBLIES. SEE FIGURE 15 TO ASSEMBLE
CARRIAGE WELDMENT TO FOURTH INTERMEDI-
ATE MAST WELDMENT.
1. FIRST INTERMEDIATE MAST WELDMENT
2. SECOND INTERMEDIATE MAST WELDMENT
3. CHAIN SHEAVE STUBSHAFTS
Figure 13. Assembling Intermediate Mast
Weldment Sections
Mast Repair
4000 SRM 1916
16