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Mills. Figure 2 shows a cutaway view of a Babcock and Wilcox MPS Pulverizer. Ring-Roll and Ball-Race Mills A ball or roller between two races or rings provides the grinding surfaces on which pulverization occurs. One or both of the races may rotate against a ball or roll (in a Ring-Roll Mill the rolls may rotate while the ring is stationary).

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Adding more coal to the process changes the load of the mill but the ball charge stays constant. The amount of ball charge in the mill is a function of the condition of the mill liners. The mill drive system consists of the main mill motor, the main reduction gear box, mill pinion and girth gear.

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Gearbox - Troubleshooting Guide

The gearbox should shift and the Hi Gear and Low Gear bits on the diagnostic page should change state. If the gearbox does not shift, it may have internal damage. If the gearbox shifts, refer to these troubleshooting guides for the high and low gear solenoids and the I/O PCB. Solenoid - Troubleshooting Guide; NGC - I/O PCB - Troubleshooting Guide

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Measure the runout of the mill flange face onto which the gear is to be mounted, using a method described in pages 9 to 12 inclusive. Take readings at the stations stamped on the mill or, if the mill is not stamped, at the same number of equally spaced stations corresponding to those stamped on the gear.

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How To Fix Trimmer Head That Will Not Spin - Fix.com

The cable or shaft connects the crankshaft from the engine at the back end of the unit to the trimmer head at the opposite side. The crankshaft attaches to the drive cable (sometimes referred to as the shaft), and connects to a gear box which allows the head of the trimmer to spin.

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