Manitowoc Published 11-22-17, Control # 257-02 4-9
MLC300 SERVICE/MAINTENANCE MANUAL BOOM
Straightness
See Figure 4-9 for the following procedure.
1. Stretch a line (string or wire) from the pin storage hole at
one end of the strap.
2. Stretch the line as tight as possible and tie it off at the
other end.
3. Mark the strap’s centerline. Do not use a center punch!
4. If the string does not align with the centerline, measure
the distance from the centerline to the line.
If deviation from straight is greater than the maximum
allowed in , remove the strap from service.
Table 4-2. Strap Straightness
Flatness
See Figure 4-10 for the following procedure.
1. Lay the strap on a flat surface. Do not put the strap on
blocks. This may cause the strap to sag.
2. Stretch a line (string or wire) across the top surface of
the strap from the pin storage hole at one end of the
strap.
3. Stretch the line as tight as possible and tie it off at the
other end.
4. Verify that the line touches the top surface of the strap at
all points along its length.
5. If the string does not touch the strap, measure the
distance from the line to the strap.
If deviation from flat is greater than the maximum
allowed in Table 4-3
, remove the strap from service.
6. Remove the line. Turn the strap over.
7. Repeat step 1
through step 5 above.
Not Acceptable
Abrasion from handling
with chain exceeds allowable limit.
Acceptable
Surface is relatively smooth and within allowable limit.
Not Acceptable
Surface is badly pitted,
exceeding allowable limit.
P325
P326
Corrosion or Abrasion
FIGURE 4-8
Strap Length
(L)
Maximum Deviation
Allowed
1,5 to <3,0 m (5 to <10 ft) 1,5 mm (0.060 in)
3,0 to <6,1 m (10 to <20 ft) 3,2 mm (0.125 in)
6,1 to <9,1 m (20 to <30 ft) 6,4 mm (0.250 in)
9,1 to <12,2 m (30 to <40 ft) 9,5 mm (0.375 in)
12,2 to <15,2 m (40 to <50 ft) 12,7 mm (0.50 in)
< = less than
Pin Storage
Hole (typical)
Centerline
String
Deviation
from Straight
A1086
Straightness (gradual
or sweeping bend)
FIGURE 4-9
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