Wrench makes a big impact.
For example, M1-series tank sprocket screws are torqued to 700-750 lb-ft. The on-board electric impact wrench can't loosen the torque on these screws. So many units use two or three soldiers, a wrench, a breaker bar, breaker bar extension, lots of muscle, and about 45 minutes of exertion to break the screws loose.
That's not only a lot of work, but it's dangerous, too. If any of the tools slip, you can be hurt.
When it's time to break loose tough hardware, nothing does the job better than a manual impact wrench. It's relatively small, compact, requires no external power, and can be operated by one person in tough environments. And yet it breaks loose high-torque components safely and easily. Here's how it works:
A heavy rotary hammer inside the wrench head turns until the nut offers enough resistance to hold the hammer stationary against a strong spring located inside the handle.
As the handle advances, a drive link begins compressing the spring. A set of cams attached to the side plates of the wrench raise three pawls from where they are engaged with the ratchet teeth.
When the handle is advanced enough, the pawls are suddenly released from the ratchet teeth. Driven by the spring, the rotary hammer snaps forward. The pawls engage the next set of ratchet teeth and deliver all of the momentum of the spring-driven rotor.
The result is a tremendous, sharp torsional blow equal to many times the force applied to the wrench handle itself. This is transmitted directly to the hardware as pure torque, breaking it free.
Once the hardware is loose, you can finish removing it with the wrench's ratcheting feature or with a standard electric impact wrench.
The manual impact wrench combo set, NSN 5120-00-961-9815, is part of the No. 2 Supplemental shop set. This set is currently being replaced by the Standard Automotive Tool Set (SATS). Units identified in the SATS basis of issue plan (BOIP #0059-AA, Module 1-AB, Module 2-AC) will be turning in their No. 2 Supplemental shop set, but will be allowed to keep their manual impact wrench set.
THE MANUAL IMPACT WRENCH COMBO SET IS ACTUALLY MADE UP OF TWO SEPARATE KITS-
A 1-IN DRIVE IMPACT KIT, NSN 5120-00-961-9814, AND A 3/4-IN DRIVE KIT, NSN 5120-00-961-9813, HERE ARE THE COMPONENTS ...
"THOUGH NOT PART OF THE KIT ABOVE, YOU CAN ALSO GET A SMALLER 3/4-IN DRIVE, 500 LB-FT IMPACT WRENCH WITH NSN 5120-00-871-2592.
HOWEVER, YOU MUST ORDER THIS WRENCH ON A DD FORM 1348-6 AND PUT "NSN NOT ON AMDF" IN THE REMARKS BLOCK.
1-in Drive Impact Wrench Kit, NSN 5120-00-961-9814 Component NSN Wrench, 1-in drive, 5120-00-440-8011 2,000 lb-ft Extension, 7-in 5130-00-449-6658 Extension, 8-in 5120-01-164-1455 Extension, 12-in, 5120-01-164-7328 for Budd wheels Extension, 13-in 5130-00-449-6659 Extension, 20-in, 5120-01-164-7327 for Budd wheels Offset link, 1 3/4-in long 5120-01-164-7329 Offset link, 4 1/4-in long 5120-01-163-9689 Box end wrench, 1 1/2-in hex 5120-01-170-3275 Box end wrench, 2 1/4-in hex 5120-01-163-9690 Impact socket, 1 9/16-in 5130-00-684-0919 Impact socket, 1 5/8-in 5130-00-221-8023 Impact socket, 1 11/16-in 5130-00-221-8024 Impact socket, 1 3/4-in 5130-00-684-0918 Impact socket, 1 13/16-in 5130-00-221-8025 Impact socket, 1 1/4-in 5130-00-189-7917 Impact socket, 1 15/16-in 5130-00-684-0917 Impact socket, 2-in 5130-00-235-5881 Impact socket, 2 1/16-in 5130-01-166-6465 Impact socket, 2 1/8-in 5130-01-166-6466 Impact socket, 2 3/16-in 5130-00-293-1375 Impact socket, 2 1/4-in 5130-00-293-1374 Impact socket, 2 5/16-in 5130-01-167-6632 Impact socket, 2 3/8-in 5130-00-293-1373 Impact socket, 2 7/16-in 5130-01-166-6467 Impact socket, 2 1/2-in 5130-01-170-3274 Tool box, portable 5140-01-163-9699 3/4-in Drive Impact Wrench Kit, NSN 5120-00-961-9813 Component NSN/PN Wrench, 3/4-in drive, 5120-00-440-8047 800 lb-ft Extension, 7-in 5130-00-449-6656 Extension, 10-in 5130-00-723-2896 Extension, 13-in 5130-00-449-6657 Offset link, 1 1/4-in long 5120-01-151-1823 Offset link, 3 3/4-in long 5120-01-151-1824 Box end wrench, 5120-01-154-5137 1 1/8-in hex Box end wrench, 5120-01-151-1805 1 1/4-in hex Box end wrench, 5120-01-154-5138 1 7/16-in hex Impact socket, 3/4-in 5130-00-227-6701 Impact socket, 13/16-in 5130-00-227-6676 Impact socket, 7/8-in 5130-00-227-6677 Impact socket, 15/16-in 5130-00-293-1411 Impact socket, 1-in 5130-00-227-6679 Impact socket, 1 1/16-in 5130-00-293-1412 Impact socket, 1 1/8-in 5130-00-227-6681 Impact socket, 1 3/16-in 5130-00-293-1413 Impact socket, 1 1/4-in 5130-00-227-6683 Impact socket, 1 5/16-in 5130-00-227-6684 Impact socket, 1 3/8-in 5130-00-227-6685 Impact socket, 1 7/16-in 5130-00-227-6686 Impact socket, 1 1/2-in 5130-00-236-3979 Impact socket, 1 7/8-in 5130-00-235-5880 Tool box, portable 41-81099-00 Maintenance manual 41-22121-34
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|Title Annotation:||Tools ...|
|Publication:||PS, the Preventive Maintenance Monthly|
|Date:||Jul 1, 2006|
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