TM 9-3405-215-14&P
NAME
NUMBER
1434
PROJECT
ENGINEERING ADJUSTMENT SUMMARY
120789-2
7
11
SHEET
OF
MODEL DBW-15
WELD UPSET FORCE :
The upset force shall be from 10 to 12 lbs. when measured at the
movable jaw with the upset force selector set for the narrowest width
band. The approximate locations of the upset force adjustment screw
(Item 6, Fig. 4) is with the back end of the screw flush with the cast jaw
surface. The final adjustment is made in the following manner:
1. Disconnect the weld lever return spring (Item 5, Fig. 4.)
2. Disconnect the jaw upset spring.
3. Bend the transformer lead that attaches to the movable jaw so that when it is connected it will just
urge the jaw to its final jaw gap position.
4. Reconnect the jaw upset spring.
5. Attach a spring scale to the movable jaw and with it, manually pull the jaw to its maximum open
position, (approximately 15/32").
6. Gradually release the pull on the scale. Note the reading when the jaw just start s to move.
7. If the spring scale reading at this point does not fall in the required range (10 to 12 lbs.) the upset
force adjustment screw must be reset, (Item 6, Fig. 4.)
8. To re-set the screw, disconnect the jaw upset spring (Item 7, Fig. 4) a d turn the screw, as
n
required.
9. Replace the jaw upset spring and re-check as in steps 5 and 6.
10. Replace the weld lever return spring.
Prepared by: Roger Harris
Approved:
Date: 7-31-69
149