TM 55-1930-209-14&P-73-4 Operating compressed air stations 1 thru 5 and 7a.Connect air hose to compressed air station quick disconnect coupling (Figure 3-6). Open air station air valve byturning counterclockwise.b.Upon completion, close compressed air station air valve by turning clockwise.c.If hose is self-retracting, It may remain attached to quick disconnect coupling. If not self-retracting, remove hoseand stow in workshop storage area.3-5Using air impact wrench with air stations 1 thru 5 and 7WARNINGSAlways wear safety glasses when operating an air impact wrench Use only Impactwrench sockets. DO NOT use sockets from a hand wrench set.3-5.1 Pre-operational proceduresa.Make sure compressed air system has been purged of moisture within last four hours. If not, open draincock onbottom of air filter 1 until all moisture has been drained from system.b.Select proper sockets for the assigned task. Loose, worn, or cracked sockets reduce wrench impact power andmay create a hazard for the operator. When possible, use deep sockets in place of long, springy extension barswhich absorb impact Always use simplest socket hookup possible, as multiple connections reduce availableimpact.c.If more than one air hose Is necessary to reach the job location, all except the short leader hose to the tool shouldbe 1/2 Inch Inside diameter If couplers are used, they must not be directly connected to the wrench air inlet. Thismakes the tool bulky and unwieldy and puts unnecessary strain on the tool inlet threads.d.Once a day, before using the wrench, pour about one tablespoon of oil into air inlet Use a turbine or spindle gradeoil with 100-150 Saybolt Universal Seconds viscosity. This oil goes in the air inlet where the hose is connected,not in the oil hole on the side of the wrench body.e.Make sure air inlet screen is clean and installed in hose adapter.3-5.2Operating the air impact wrencha.Turn torque regulator on front of handle to low power position by rotating knurled knob fully clockwise as you lookdown on the tool from above.b.Place tool on bolt or nut to be worked and squeeze trigger. Slowly rotate knurled knob counterclockwise untildesired power is being applied. If disassembling rusty or other hard to remove bolts/nuts, turn knob fullycounterclockwise. If nut/bolt does not start to move in three to five seconds, try other means of removing it.c.If wrench appears to be losing power, follow troubleshooting procedures on page 2 of Operating Instructions andParts Manual, Air Impact Wrench, in Appendix B.3-8
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