TM 5-3895-373-34
2.67
REPLACE MAIN SCREED FRAME - Continued.
C.
INSPECT.
1.
INSPECT MAIN SCREED FRAME.
WARNING
Main
screed
frame
weighs
approximately 700 lbs (318 kg). Main
screed frame will be suspended by a
chain hoist during inspection. Do not
allow personnel to move or work
beneath main screed frame while
suspended. Severe injury or death
can result from main screed frame
falling or dropping while suspended.
a.
With hex head screw caps installed in main
screed frame (93), suspend main screed frame
at a height of 1.0 to 2.0 in. (25,4 to 50,8 mm)
over work surface. Main screed frame must be
supported only by hex head screw caps.
b.
Measure distance between threaded bore (96)
centers, between points A-A and B-B, using a
straightedge.
c.
If distances between threaded bore center points
A-A and B-B vary greater than 1/16 in. (1,58
mm) between the two points, replace main
screed frame (93).
d.
Install hex head cap screws (97), used to hold
extension screed guide shaft support to main
screed, into threaded bores (98).
e.
Place a combination square against top shank
surface of hex head cap screws (97) and hold
against surface C of main screed frame (93),
holding top part of square flat against shank of
hex head cap screws.
f.
If surface C of main screed frame (93) is greater
than 1/16 in. (1,58 mm) from edge of
carpenter’s square at any point, replace main
screed frame.
g.
Place a straightedge across surface D. If any
point on surface D is greater than 1/16 in. (1,58
mm) from straightedge, replace main screed
frame (93).
h.
Visually inspect main screed frame (93) weld
joints and lower burner box for cracks or breaks.
Replace main screed frame if cracks or breaks
are detected at any point on frame.
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