Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 4-13
999 SERVICE/MAINTENANCE MANUAL BOOM
4
Corrosion or Abrasion
See Figure 4-12 for the following procedure.
For quick identification by repair workers, clearly mark
damaged areas with brightly colored tape.
1. Sandblast to remove corrosion. Do not grind!
2. Determine reduction in thickness.
3. If reduction is less than 6% of strap thickness, paint
strap to maintain continuous protective coating.
4. If reduction is 6% or more, remove strap from service.
Straightness
See Figure 4-13 for the following procedure.
1. Stretch a line (string or wire) from pin storage hole at one
end of strap.
2. Stretch line as tight as possible and tie it off at other end.
3. Mark strap center line. Do not use center punch!
4. If string does not align with center line, measure
distance from center line to line.
If deviation from straight is greater than maximum allowed,
remove strap from service.
Not Acceptable
Abrasion from handling
with chain exceeds allowable limit.
Acceptable
Surface is relatively smooth; within allowable limit.
Not Acceptable
Surface is badly pitted;
exceeds allowable limit.
P325
P326
FIGURE 4-12
Corrosion or Abrasion
Strap Length
(L)
Maximum Deviation
Allowed
5 to <10 ft (1.5 to <3,0 m) 0.060 in (1,5 mm)
10 to <20 ft (3.0 to <6,1 m) 0.125 in (3,2 mm)
20 to <30 ft (6,1 to <9,1 m) 0.250 in (6,4 mm)
30 to <40 ft (9,1 to <12,2 m) 0.375 in (9,5 mm)
40 to <50 ft (12,2 to <15,2 m) 0.50 in (12,7 mm)
< = less than
FIGURE 4-13
Pin Storage
Hole (typical)
Center line
String
Deviation
from Straight
A1086
Straightness (gradual
or sweeping bend)

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English