Figure 4. Inserting Adjusting Spacers

Figure 2. Installing Dial Indicator (Rack Gauge)

Figure 6. Making Preliminary Governor Cut-Off Adjustment

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL CALIBRATION Section 5 8. Read dial indicator for proper lift (see Calibration Chart for specification). Zero the pump stand degree wheel at this point for phasing. Return tappet to B.D.C. and repeat Steps 6 and 7 to ensure repeatability. 9. Compensate for deviation from the specified measurement by inserting the proper size adjusting spacer (available in thickness steps of 0.05 mm) between the barrel flange and pump housing (Figure 4). IMPORTANT ADJUSTING SPACERS OF THE SAME THICKNESS MUST BE USED ON BOTH SIDES OF BARREL AND VALVE ASSEMBLY AND ONLY ONE SPACER SHOULD BE USED ON EACH SIDE. Figure 4. Inserting Adjusting Spacers 1. Adjusting Spacers PHASING 10. Check port closure for the remaining plungers in pump discharge order by rotating the camshaft in 60 degree intervals. No. 1 No. 5 No. 3 No. 6 No. 2 No. 4 0 60 ± 1/20 120 ± 1/2 180 ± 1/2 240 ± 1/2 300 ± 1/2 At each of these intervals check port closure as outlined in Steps 7 and 8 (nozzle bleeder screw opening to correspond with element number). 11. If port closure is not exactly as specified 1/2 degree, adjust by selecting proper spacer for under the barrel flange. If port closure occurs too early, increase spacer thickness. If too late, reduce spacer thickness.0.05 mm spacer equals 0.2°. GOVERNOR ADJUSTMENT 12. Insure zero dial indicator setting as outlined in Step 2. Adjust shut-off lever stop screw (Figure 5) to 1.5 - 2.0 mm (.060 - .079") rack position. Figure 5. 1. Shut-off Lever Stop Screw CGES-375 Printed in United States of America Page 3

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