TM 9-2320-209-10-1 FRAME 4 WARNING 1. 2. 3. Do not let personnel stand near auger while boring or spinning soil off auger. Soil spun off may contain objects that can cause injuries. CAUTION To prevent damage to boring machine, do not make sudden starts (impact loads) when starting to bore. Do not load auger above bumper spring. When auger point (1) enters ground, push drive control lever (2) and feed control lever (3) forward to start boring (position 4, table 4-3). Keep auger turning speed down to 25 rpm (1800 engine rpm) until hole is about 18-inches deep. If auger is working smoothly, set auger turning speed for type of soil. (Refer to table 4-4 and para 4-15h.) GO TO FRAME 5 Table 4-4. Gear, Speed Settings for Soil Conditions Transmission Soil Type Gear Sandy Clay, Ordinary Soil 3rd Disintegrated Shale, Similar 1st 2200-2650 90-110 Sandstone, Frozen Soil I 2nd Engine Speed Auger Speed (rpm) (rpm) 1800 25 1700-2400 40-60 4-341