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REPAIR OR REPLACEMENT - TM-5-4210-230-14P-1_888
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  4  Exploded View Screen Filter Type Fuel Pump
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FUEL SYSTEM Priming the fuel system will be required whenever a fuel   filter   is   changed,   lines   are   disconnected   or   when   the electric in-tank fuel pump is replaced. 1.  Be sure fuel tank has sufficient fuel. 2.  Turn switch key to "ON" position.  (Do not start engine.) 3.  Hold primer switch to "ON" position to energize electric fuel pump. 4.  Open vent valve on top of primary filter, close valve when fuel flows out in solid stream. 5.  Open vent valve on secondary filter; close valve when fuel flows out in a solid stream. 6.  Release primer switch. PRESSURE   CHECKING   DIESEL   ENGINE   FUEL   SYSTEM (General) The  locations  for  making  "on-engine"  transfer  pump pressure checks or lift pump pressure checks are as follows: 1.  Transfer Pump Pressure: This check is now made directly on injection pump.  Install an adapter fitting to priming inlet at   front   of   injection   pump   and   connect   compound   test gauge  (SE2004-1)  or  test  kit  (SE-2239).    Operate  engine under load and check transfer pressure (25-40 psi). 2.  Lift Pump Pressure (now electric fuel pump): This check is made at primary filter.  Install adapter and compound test gauge (SE-2004-1) or test kit (SE-2239) to priming vent on primary   filter.      Operate   engine   under   load   and   check pressure (3 to 5 psi). SERVICE FUEL PUMP Screen Filter Type Disassembly The  disassembly  of  mechanical  pumps  having  the screen  filter,  Fig.    4,  can  be  accomplished  in  the  following manner: 1.    Remove  the  cover  bolt,  cover  and  cover  gasket.    Also remove the screen disc filter. 2.    Match-mark  the  valve  housing  and  pump  body  to  assure correct re-assembly of parts. 3.    Remove  the  screws  which  hold  the  valve  housing  on  the pump body.  Separate the housing from the body. 4.  Remove the fuel valve retainer screws and retainer and lift the  inlet  and  outlet  valves  and  gaskets  out  of  the  valve housing. 5.  Unhook the diaphragm from the diaphragm lever and pull the   diaphragm   and   pull   rod   assembly   straight   out   to prevent  damage  to  the  oil  seal.    Remove  the  diaphragm spring. 6.  Remove the oil seal retainer and oil seal from the pump. 7.    If  necessary  to  replace  the  cam  lever,  remove  the  pin retainers  from  the  end  of  the  rocker  arm  pin.    Drive  out the pin and withdraw the cam lever spring and diaphragm lever from the pump body. Inspection If a fuel pump is overhauled, the diaphragm gaskets, valves, cam lever, spring and diaphragm lever should always be replaced whether these old parts appear serviceable or not. Fuel pump repair kits containing these parts are available.  All other parts should be inspected as follows: 1.  Inspect the pump body and valve housing for cracks and breakage. 2.  Check the pump body, valve housing and cover against a flat surface for warpage. 3.  Examine the pump body and valve housing for stripped or crossed threads. 4.  Replace screen. 5.  Check the cam lever for wear at the camshaft pad and also for wear at the point contacted by the diaphragm lever. 6.  Check the springs for corrosion, fracture or weakness. Assembly All  fuel  pumps  having  the  screen  filter  will  have  an assembly procedure similar to the following.  Refer to Fig.  4 for numbers in parentheses. 1.    If  the  cam  lever  (21)  was  removed,  place  seal  (16),  seal retainer   (15)   and   spring   (14)   in   pump   body   (17)   and install   pull   rod   of   diaphragm   assembly   (13)   through spring, retainer and seal.  Assemble diaphragm lever (22) with   cam   lever   (24)   and   insert   hooked   end   of   lever through   opening   in   pump   body   (17)   and   engage   with diaphragm pull rod.  Make sure lever spring (19) is also in place.  Obtain a piece of welding rod or CTS-2050-F Page 5 PRINTED IN UNITED STATES OF AMERICA

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