Quantcast SECONDARY CONTROL VALVE TROUBLE SHOOTING

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: SECONDARY CONTROL VALVE TROUBLE SHOOTING
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
ELECTRONIC VACUUM MODULATING (EVM) GOVERNOR SYSTEM TROUBLE SHOOTING PROCEDURE (cont)
Up
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Next
On the Vehicle Test
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 TROUBLE SHOOTING 5.    Apply battery voltage to solenoid valve side of cable as shown.  The solenoid valve should make a slight noise  or  movement  felt  when  current  is  applied  and released   indicating   the   solenoid   valve   plunger   is operating. a. If the solenoid is operating properly, proceed to step 6. Figure 68. Step 6 1.   To Solenoid Valve Case 6. “A” Port Closed 2.   Battery, 12 Volt 7. Air Output 3.   Solenoid Cable 8. Use Vacuum Hose for Air 4.   “A”  Port Open Input Test 5.   “B”  Port Open 9. Air Output 10.  “B” Port Closed b.     If   the   noise   is   not   heard   or   movement   felt, remove   solenoid   valve   and   cover   assembly from   carburetor.      Make   a   resistance   check with   an   ohmmeter   from   the   solenoid   valve cable  to  the  valve  assembly  case  as  shown. The  ohmmeter  should  read  approximately  50 + 10 ohms.  If resistance is zero or a very high reading, the solenoid valve assembly must be replaced. c.     If  resistance  is  50  +  10  ohms,  the  solenoid valve  windings  are  good.    Remove  solenoid valve from cover.  Check to see if valve seat is sticking,  keeping  solenoid  valve  plunger  from operating. 6.    If  Steps  1  through  5  have  proved  that  the  electrical portion of governor system is operating properly, the trouble  must  be  in  the  cover  vacuum  passages  on the carburetor. a.     With solenoid valve assembled to cover, apply air through  a  small  diameter  hose  as  shown  to  port “A,”   then  port   “B”    to  insure  passages  are  clear. With  battery  voltage  applied:  Port  “B”   should  be closed.  Port “A”  should be open.  Without battery voltage applied: Port “B”  should be open.  Port “A” should be closed. b.     If  solenoid  valve  plunger  is  not  seating  properly, replace solenoid valve. c.     If   vacuum   passages   in   the   cover   are   clogged, clean    (cover    only)    with    commercial    carburetor cleaning solvent. 7. Some  carburetor  malfunctions  that  are  not  a  part  of  the EVM governor system may affect governor action.  These malfunctions  can  be  corrected  by  using  the  CLEANING AND INSPECTION portion of this service manual. SECONDARY CONTROL VALVE TROUBLE SHOOTING Malfunction   of   the   secondary   control   valve   can   cause fluctuation  of  engine  speed  (“surging”)  when  the  governor  is  in effect or failure of the governor to limit engine speed. Because  calibration  of  the  control  valve  requires  special equipment,    the    secondary    diaphragm    cover    (with    secondary control  valve)  is  assembled,  calibrated  and  sealed  at  the  factory and  furnished  for  service  only  as  an  assembly.    Control  valve components are not serviced separately. Outlined  in  the  following  paragraphs  are  procedures  for testing the secondary control valve.  These procedures are used to determine  if  the  control  valve  is  satisfactory  or  if  it  should  be replaced. Bench Test The   following  “bench”    test   procedure   can   be   used   to check functioning of the control valve.  It is recommended that this check  be  made  at  the  time  of  carburetor  overhaul  or  if  improper valve operation is suspected. 1.    Connect a controllable vacuum source to the vacuum inlet of the control valve diaphragm chamber, as shown in Fig.  69.  (Distributor tester SE-1925 or SE-1979 can be used as a vacuum source.) Apply 6 inches of vacuum CGES-125-T Page 43 PRINTED IN UNITED STATES OF AMERICA ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 TROUBLE SHOOTING to the diaphragm chamber.  If vacuum holds, the control valve diaphragm  is  satisfactory.    If  vacuum  cannot  be  maintained,

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

Integrated Publishing, Inc.
6230 Stone Rd, Unit Q Port Richey, FL 34668

Phone For Parts Inquiries: (727) 493-0744
Google +