Figure 4-3. Adjustment Set-up

Cleaning, Inspection and Repair - TM-5-3820-256-24-1_54

TM-5-3820-256-24-1 Drilling System Manual
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i. Assemble the housing (12) to body (36) and install lockwashers (10) and nuts (9). 4-3.1.5 Installation. a. Install strainers (3) and gaskets (4) in pipe bracket (2). b. Position assembled valve on pipe bracket and install capscrews (1). 4-3.1.6 Pilot Valve Lever Adjustment. (Refer to figure 4-2) Figure 4-3. Adjustment Set-up a. Use the adjustment set-up illustrated in figure 4-3. Turn adjusting screw (24) in until control spring (27) is slightly compressed. Remove valve protectors (47). Move the valve handle (7) back and forth, on both sides of the "OFF" position, observing the action of levers (41 and 45). The pilot valves should be fully open after the handle moves through the first 10° travel arc. If the pilot valve levers need adjusting, place the handle in a maximum increasing pressure position. With a 3/32" hexagon wrench, turn adjusting screw (44) of the activated lever (either 41 or 45) out, just far enough to crack the exhaust valve. The gage will show a drop in pressure. From this point, turn the adjusting screw in a full three (3) turns. This will open the inlet valve of the pilot valve to its maximum capacity. b. Move the handle to the opposite extreme position and repeat the adjustment for the other pilot valve lever. 4-3.1.7 Cam Dog Adjustment. (Refer to figure 4-2) The eccentric cam dog pin (38) aligns the cam dog (39) with the rise on cam (15). If pressure response is not identical to handle position in both quadrants, compensate this difference by turning the cam dog pin (38) either clock-wise or counterclockwise. 4-3.1.8 Pressure Setting Adjustment. (Refer to figure 4-2) Use the adjustment set-up illustrated in Figure 4-3. Adjusting screw (24) varies the minimum and maximum pressure setting a like amount without changing the range of pressure. Turning the adjusting screw in raises the maximum and minimum pressure, turning it out decreases the maximum and minimum pressure. 4-3.1.9 No Preload Setting. (Refer to figure 4-2) a. This setting has the OUT ports open to exhaust and the IN port is closed in the normal position. 4-24

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