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Heater Unit.
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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_246
TM 5-4210-220-12 4-12.  CAB - Continued REMOVAL (1)    Crimp  heater  hoses  using  suitable  pliers  to  prevent  loss  of  engine  coolant.    Remove  inlet  and  outlet winterization hoses and clamps (A) (below cab floor). (2)  Loosen hose clamps (5 and 6) and disconnect flex hoses (7 and 8). (3)  Loosen hose clamps (24 and 25) and pull heater hoses from barbed nipples. (4)  Remove screws (11) and nuts (12) and pull heater unit out of cab. (5)  Tag and cut the wires (13 and 14) as well as the colored blower motor wires.  Cut the wires as close as possible to the butt splices (21). (6)  Remove screws (15) and nuts (16) and remove blower unit. INSPECTION (1)    Inspect  heater  box  components  for  superficial  damage  and  defects.    A  trace  of  crystal  deposit  left  by evaporated coolant often indicates a potential leak or a weak joint.  If any traces or deposits are noticed, test the components as detailed under Heater Core and Plumbing Repair following. (2)  Check that the movement of diverter arm (23) is smooth and unobstructed and that the heater core is solidly attached to the heater box.  Tighten the attaching screws if necessary. (3)  Inspect flexible hoses (8, 7, and 18) as well as the air diffusers (19 and 20).  Replace damaged hoses if the air diffusers (19 or 20) are damaged, notify Direct Support Level for repair. NOTE Use flexible hose (64 - 2920X) and cut to appropriate length when replacing Items (7, 8, and 18). (4)    Inspect  the  blower  unit.    Check  that  blower  wheels  and  housings  do  not  rub  against  one  another. Rubbing caused by minor damage to the housing may be eliminated by straightening dents or bends in housing walls. (5)    Inspect  bulkhead  fittings  (10)  and  barbed  hose  fittings  (9).    Fittings  with  stripped  thread  or  surface damage that could cause leaks must be replaced. INSTALLATION (1)  Install blower unit (17) to cab floor using six screws (15) and nuts (16).  Tighten nuts firmly. (2)  Install heater box (4) complete with heater core.  Attach box using six screws (11) and nuts (12). (3)  Attach heater hoses to 'barbed nipples on floor of cab.  Tighten clamps (24 and 25). 4-105

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