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EXTERNAL LEAKAGE DIAGNOSIS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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EXTERNAL LEAKAGE 235 SERIES PUMP
TM 5-4210-230-14&P-1 TRUCK SERVICE MANUAL STEERING 1. Check oil level.  An overfilled pump reservoir can be a cause   for   leakage.      The   oil   in   the   steering   system expands  as  heated  during  normal  usage.    If  overfilled the  excess  is  forced  through  the  reservoir  cap  vent. Operate  the  engine  and  steering  system  until  normal operating    temperature    is    obtained.        Remove    the reservoir  cap  and  check  level.  Adjust  the  oil  level  as required. If leakage persists with the oil level correct and the cap tight, replace the cap. Air   in   the   system   can   also   cause   the   fluid   level   to   rise, especially after system repair. Bleed the system as described in the MAINTENANCE section of this chapter. 2. Replace reservoir. 3. If  leakage  persists  upon  tightening  the  fitting  nut  to specified torque: a. Loosen   the   nut   and   rotate   tubing   to   reseat   with brass connector.  Tighten nut again and recheck.  If leakage still persists, proceed to 3b. b. Remove  the  hose  and  check  the  sealing  .face  for cracks.  If a cracked flare is found, replace the hose. If no cracks are observed, proceed to 3c. c. Replace  the  brass  connector  and  reface  the  tube flare.  Also, check the threads in the pump housing and on the fitting nut.  If nut threads are damaged, replace   the   nut.   If   pump   housing   threads   are damaged,  replace  both  the  housing  and  the  nut.  If either  the  return  hose  or  the  pressure  hose  leaks, other than at the nut connections, replace the hose. 4. Tighten  fitting  to  specified  torque.    If  leakage  persists, replace both "O" ring seals. 5. Replace reservoir "O" ring. 6. Replace drive shaft seal after inspecting and thoroughly cleaning  the  sealing  surface.    Replace  drive  shaft  if severe  pitting  is  found.  If  the  corrosion  in  the  lip  seal contact  zone  is  slight,  clean  the  surface  of  the  shaft with  crocus  cloth  first.    Always  replace  the  seal  if  the shaft is replaced. EXTERNAL LEAKAGE 235 SERIES PUMP Fig. 9   Suspected Leakage Areas CTS-2296R  Chapter 1, Page 12 PRINTED IN UNITED STATES OF AMERICA

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