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Roof Turret.
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPAIR - TM-5-4210-220-12_392
TM 5-4210-220-12 4-18.  PUMP, PIPING, AND VALVES - Continued REMOVAL (1)  Close roof turret ball valve (1). (2)  Remove victaulic coupling (2), see para. 4-18.3. (3)  Remove the four locknuts (11) and two studs (12, 13) that retain the handle assembly (10) to the turret. Discard locknuts. (4)  Pull fast pin (14) from handle lock (15) and remove handle assembly (10). (5)  Loosen gear clamp and remove hose (3) from automatic drain valve (4). (6)  Remove automatic drain valve (4), fittings, and street elbow from base of roof turret. (7)    Remove  the  four  capscrews  (5),  washers (7),  and  locknuts  (6)  that  retain  the  turret mounting plate (8) to the cab roof (9). (8)      Using   a   screwdriver,   break   the   sealant bond     between     the     roof     (9)     and     the mounting plate (8). (9)      Carefully   maneuver   the   roof   turret   and mounting  plate  assembly  out  of  truck.    It may   be   necessary   to   turn   roof   turret   to allow   the   control   handle   and   bracket   to clear the roof turret hole. INSTALLATION (1)  Clean old sealant from the roof (9) and the mounting plate (8). (2)  Apply a continuous bead of sealant (item 25, Appendix E) to the perimeter of roof turret hole. (3)  Lift roof turret assembly onto truck roof and carefully lower it into plate.  It will be necessary to turn roof turret to allow the control handle and bracket to clear the roof turret hole. (4)  Align mounting holes with minimum lateral movement.  Apply sealant (item 25, Appendix E) to capscrew shoulders (5), washers (7) and install them into the mounting holes.  Install locknuts (6) and tighten to 28 ft lb (38 Nm). (5)  Apply pipe sealant (item 22, Appendix E) to threads of fittings and assemble as shown. (6)  Install drain hose (3) onto barbed nipple.  Install gear clamp and tighten firmly. (7)  Install victaulic coupling (2), see para. 4-18.3. (8)  Lift the handle assembly (10) up to turret and align the mounting holes. (9)  Install studs (12, 13) and locknuts (11) and tighten to 17 ft lb (23 Nm). 4-261

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