Manitowoc National Crane NBT40 Series - Page 79

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National Crane Published 8-01-2017 Control # 287-11 4-5
NBT40 SERVICE MANUAL BOOM MAINTENANCE
TORQUE VALUES for Second Nut:
Inch Series with Coarse Threads (UNC)
Cable end
Thread Size
Minimum
Nut
Strength
GRADE
Nut Type
TORQUE
ft lbf
1/2-13 SAE 2
Hex Jam
(HALF)
12
5/8-11 SAE 2
Hex Jam
(HALF)
31
3/4-10 SAE 2
Hex Jam
(HALF)
47
7/8-9 SAE 2
Hex Jam
(HALF)
63
1-8 SAE 2
Hex Jam
(HALF)
199
1 ¼-7 SAE 2
Hex Jam
(HALF)
203
1 ½-6 SAE 5
Hex Jam
(FULL)
250
1 ¾-5 ASTM B
Hex Jam
(FULL)
250
1ST STAGE
1/2/3 EXTEND CABLE
2/3/4 EXTEND CABLES
4TH STAGE
3RD STAGE
2ND STAGE
4/3/2 RETRACT CABLES
3/2/1 RETRACT CABLES
FIGURE 4-4
Reference Only