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Spring Brake Valve
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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 (cont) - TM-5-4210-220-12_473
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued (4) Connect  truck  batteries  and  start  main  engine.    When  air  system  is  pressurized,  release  the  parking brakes (5) Check all connections for leaks using a brush and soap solution.  Tighten as required. (6) When brakes are released, pressure gage on inlet port should read at least 65 psi (450 kPa) (7) Place parking brake in the PARK position.  Be sure the spring brakes on the rear wheels apply promptly and pressure reading drops quickly to zero.  When set to RELEASE, be sure brakes release promptly. (8) Open the primary reservoir draincock and allow it to drain.  Apply the foot brake several times and note the  gage  pressure  reading.    Check  that  the  pressure  drops  continuously  and  the  parking  brakes  do  not release after some more attempts. (9) Shut down main engine and drain all air tanks (10) Remove gage and tee from spring brake valve.  Replace with the original elbow. (11) Repressurize all air tanks with main engine and check brakes on moving vehicle REPAIR NOTE The spring brake valve can only be repaired if it is removed from the truck.  See REMOVAL preceding. (1) Remove the socket head pipe plug (1) (2) Remove the check valve spring (2) and the check valve (4) (3) Remove the two screws and exhaust cover (5) (4) Separate the exhaust diaphragm (6) from the cover (5) Remove the inlet and exhaust valve assembly (7) (6) Remove the inlet and exhaust valve cap nut (8) and separate the cap nut O-ring (9) (7) Remove the valve stop (10), valve spring (1 1), and inlet and exhaust valve (12) CAUTION The cover is under a spring load, and should be held while removing the screws. 4-345

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