Quantcast TROUBLE SHOOTING THE STARTING MOTOR CIRCUIT

Order this information in Print

Order this information on CD-ROM

Download in PDF Format

     

Click here to make tpub.com your Home Page

Page Title: TROUBLE SHOOTING THE STARTING MOTOR CIRCUIT
Back | Up | Next

Click here for a printable version

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Combat
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
USMC
   
Products
  Educational CD-ROM's
Printed Manuals
Downloadable Books
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
DESCRIPTION - TM-5-4210-230-14P-1_618
Up
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Next
Fig.  3  Starting Motor Circuit
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL 2. Bushings  should  be  coated  with  a  medium  grade  of engine oil. 3. The   armature   shaft   should   be   coated   lightly   with   a medium grade of engine oil. 4. The drive assembly should be wiped clean. CAUTION: Do  not  clean  in  any  degreasing  tank  or  with grease  dissolving  solvents,  this  will  dissolve the lubricant in the clutch mechanism. 5. Relubricate  the  sprag  clutch  with  a  medium  grade  of engine oil. CAUTION: Avoid excessive lubrication. TROUBLE SHOOTING THE STARTING MOTOR CIRCUIT When trouble develops in the starting motor system, and the starter motor cranks the engine slowly or not at all, several preliminary  checks  can  be  made  to  determine  whether  the trouble is in the battery, starting motor, wiring circuit between them,  or  elsewhere.    Many  conditions  besides  defects  in  the motor can result in poor cranking performance. To  obtain  full  performance  from  a  starting  motor  or  to determine the cause of abnormal operation, the motor should be subjected to one or more of the following tests.  Failure of the   motor   to   perform   according   to   the   specifications   will require removal of starter and disassembly and further checks or adjustments made. NOTE: All  starting  motor  tests  should  be  made  with engine  and  battery  at  room  temperature  (not cold). Regardless    of    the    construction,    never    operate    the starting   motor   more   than   30   seconds   at   a   time   without pausing to allow it to cool for at least 2 minutes.  Overheating, caused   by   excessive   cranking,   will   seriously   damage   the motor. For the most part a volt-ampere tester (SE2283) will be used in performing the starter tests and the instruction manual supplied  with  the  tester  will  provide  the  detailed  instructions using the volt-ampere tester. NOTE: All  illustrations  of  starting  motor  and  circuit tests   show   leads   connected   for   NEGATIVE grounded  system.    Reverse  the  positions  of the leads when testing a POSITIVE grounded system.  Make sure the volt selector switch on the  volt-ampere  tester  is  positioned  properly for the voltage system being inspected. Test No.  1 -- Cranking Voltage Test This test tells us the overall condition of battery, starter, cables    or    switches    to    determine    if    sufficient    voltage    is available    to    operate    ignition    system    when    starter    is    in operation. Connect  voltmeter  leads  at  the  starter  observing  the polarity,  Fig.    2.    Disconnect  secondary  coil  lead  to  prevent engine  from  starting.    Crank  engine  noting  voltmeter  reading (should be 9.  6 volts or better with 12-volt electrical system). If a reading of less than 9.6 volts is found, proceed to the next tests. Fig.  2  Cranking Voltage Test Test No.  2 -Battery Capacity Test The  battery  capacity  test  is  performed  to  determine  if the battery is in satisfactory condition.  See "Battery" Section. If the battery passes this test, continue the next test. Test No.  3 -Voltage Drop Test Generally,  the  starting  or  cranking  circuit  is  a  series circuit  from  the  battery  insulated  post  to  the  starting  motor solenoid,  to  the  motor,  to  ground  (chassis)  and  return  to  the battery ground post, Fig.  3. In the cranking circuit we also have a cranking control circuit,  Fig.    3.    In  this  circuit  the  solenoid  is  controlled  or operated by closing an ignition switch or push button starting switch at the instrument panel.  In this cranking control circuit there are frequently some safety switches such as transmission  "neutral  safety  switch"  and/or  vacuum  operated cutout switch. CTS-2258N  Page 4 PRINTED IN UNITED STATES OF AMERICA

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc.