TM 5-3805-260-24 INTRODUCTION The Tee Test is a method of testing a hydraulic system  under  conditions  as  close  as  possible  to  those existing  when  the  system  is  in  operation.    When  used correctly, the  Tee  Test  will  find  the  cause  of  a  problem. When    used    as    part    of    a    preventive-    maintenance program,  it  will  give  an  indication  of  a  problem  that  can cause a failure. When   an   analysis   is   made   of   the   hydraulic system, a standard procedure must be used to check it. The  method  used  to  check  the  system  will  follow  these steps in order: 1.  Visual Checks 2.  Performance Tests 3.  Instruments Tests The procedures to follow for each of these steps are  given  in  the  Testing  and  Adjusting  section  of  the Service Manual for each machine. EQUIPMENT INSTALLATION (Ejector and Bowl System) 1.    With  the  engine  stopped,  slowly  remove  the cap  on  the  hydraulic  tank  to  release  any pressure and then tighten.  Start the engine and   move   the   ejector   to   the   full   forward position.    This  will  cause  a  vacuum  in  the tank   to   keep   oil   leakage   at   a   minimum. Stop the engine. WARNING:    Do  not  install  the  adapter for  the  supply  line  for  the  pump  or  the return line assembly with the engine ON (running).  Injury to personnel can be the result. 2.  Remove the plug for the tee test from the supply line elbow. 3.  Install a supply line adapter in the supply line elbow. NOTE: Install the adapter as rapidly as possible to keep the oil loss at a minimum. 4.  Remove the plug for the tee test from the filter cover assembly. 5.  Install the return line adapter. 6.    Connect  the  return  line  hoses  and  the  supply  line hose to the flow meter. 7.   Connect   the   return   line   hose   to   the   return   line adapter. 8.  Connect the supply line to the supply line adapter. WARNING: A plain coupler will not open the valve in the adapter for the pump supply line.  Use a valved coupler against a valved nipple when hoses are connected. 9.  Install the tachometer generator with the correct drive. 10.    Install  the  cable  between  the  tachometer  generator and  the  input  connection  for  the  tachometer  (rpm) on the flow meter. PREPARATION OF SYSTEM FOR TEST 1. Open the manual load valve fully (turn counterclockwise). 2.  Start the diesel engine. 3.  Move the ejector  control  lever  to  the  FOR-WARD  or OPEN POSITION. 4.    With  the  engine  at  test  rpm,  slowly  turn  the  manual load valve clockwise until the pressure goes upl) to 1000 psi. 5.  Look at the oil temperature gauge. 6.  When the oil temperature is 100° F, turn the manual load valve clockwise until the pressure is 1500 psi. 7.  When the oil temperature is 1600 F, move all control levers several times to get full cylinder movement of all cylinders. 8.    Move  the  cylinders  and  run  the  elevator  as  long  as needed to get the desired oil temperature of 1500 F all through the system. 9.  Put a chain around the elevator to prevent movement. SCRAPER    EJECTOR    AND    BOWL    SYSTEM    TEST (CHART A) Write Down the Basic Test Data NOTE:   Conditions   in   the   hydraulic   system   must   be constant  before  you  write  down  the  test  data.    The control levers must be held in the exact position desired. Best results are found when oil temperature is 150 5 F.   4-31