4-9.3.3 Adjustment. If the clutch heats, jumps out of engagement, or does not hold, the clutch must be adjusted.a.Disengage the clutch, and turn the clutch until the adjusting lock pin (6) can be reached. Pull the pin out, andlock in the "out" position by means of a piece of wire or small nail pushed through the cross-drilled hole in thepin.b.Turn the adjusting yoke (5) clockwise one or two adjusting holes, or until the clutch requires a distinct pressure toengage. Slotted holes are provided in the clutch cover (4) for the insertion of a drift pin for tapping the adjustingyoke should the yoke be too snug to be moved by hand.4-9.4 HoistingandAuxiliaryDrum. (Figure 4-26).4-9.4.1 Removal and Disassemblya.Spool cable off both drums, loosen setscrews (1) and remove cable. Remove covers.b.Attach a hoisting device to the drum assembly that will support it when end bearings are removed.c.Disconnect air lines from rotor seal (2). Tag airlines for proper location at assembly. Remove screws (3) andremove rotor seal and bayonet (4) from shaft.d.Remove screws (5), adapter (6) and o-ring (7).e.Loosen setscrew (8) and remove sprocket (9) and key (10).f.Remove nuts (11), lockwashers (12) and screws (13). Remove retainers (14) with bearings (15) and spacers (16)from shaft.g.Remove nuts (17), lockwashers (18) and screws (19).h.Lift complete drum assembly out of drawworks frame.i.Remove screws (20), and remove drive rings (21) from hoisting drum (22) and auxiliary drum (23).j.Refer to paragraph 4-9.5.1 and remove the two clutch assemblies (24) from the shaft. Remove keys (25).k.Remove screws (26), plates (27), with seals (28), and spacers (29), with o-rings (30).I.Pull hoisting drum (22) with bearing (31), and auxiliary drum (23) with bearing (32) from shaft.m.Remove spacers (33), then pull bearings (34) from shaft (36). Remove pillow block assembly (35).n.Replace any worn or damaged parts. Use new seals and o-rings at assembly.4-120
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