e.Assemble front and rear housings. This should be done with lapped faces of carbon facing upward to preventinternal parts from dropping out of position. Place air inlet holes in desired position. Fasten housings (1) and (2)with socket head screws (22) and (23) lockwashers. Tighten screws securely to equal tension, and checkrotorseal for smooth operation.4-9.7 DrumBrakes. The brake bands for the hoisting, auxiliary and third drum brakes are identical. Use the followingprocedure to remove and repair the brake bands. Refer to figure 4-28A.WARNINGAll load must be removed from the cable of the drum being repaired. Releasing of the drumbrake allows the drum to "free-spool", and any load on cable would fall creating a hazard topersonnel. Never operate a drum with worn brakes band.a.Removal.(1)Remove all load from drum cable, then release brake control.(2)Remove drawworks guards as necessary to gain access to brake band.(3)Remove cotter pins (1) and anchor pins (2) at shaft (4) and anchor bolts (5).(4)Remove brake band (3) from drum.Figure 4-28A. Drum Brakes4-127
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