1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

Cat 988B heating issue

Discussion in 'Wheel Loaders' started by ajginger, Feb 24, 2020.

  1. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    Sounds better but I was getting a bit worried near the end with it working on the side slope, seemed to be a little tippy!
    And looks like someone needs to work on the right ladder!
     
  2. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Thanks Kshansen......

    This 988 has the rocker switch on the lift lever.

    The green light was broken when I got it and has since been replaced
    ( green lens and bulb ) but it does nothing when the rocker switch is activated.

    Yes, the serial number is 50W03844
     
  3. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    You've got mail!
     
    ajginger likes this.
  4. Nige

    Nige Senior Member

    Joined:
    Jun 22, 2011
    Messages:
    14,974
    Location:
    G..G..G..Granville...........!!
    I did send the OP the appropriate electrical schematic a while back Ken,
     
    ajginger likes this.
  5. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    Well now he has two copies, between those and the other files I sent him he should have enough reading to keep him busy for the weekend!
     
    ajginger likes this.
  6. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Thanks for that Nige
    I remembered & had a look and found the copy you sent to me.
     
  7. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    I have carried out this test & can say that there seems to be no function of the vctc switch at all so I have purchased a new solenoid for the vctc switch.......

    question : Where is the solenoid located ? I cant seem to locate it.
     
  8. rmllarue91

    rmllarue91 Senior Member

    Joined:
    Apr 17, 2014
    Messages:
    539
    Occupation:
    field technician
    Location:
    northeast pa
    sit on left rear tire pull panel it's on torque converter housing if I recall
     
  9. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Thanks rmllarue. I assume you would mean ' left rear tyre ' while I am facing the direction the machine is facing.

    I cant see it anywhere ...... I am starting to think it has been removed and blanked off with a bolt or something as I cant even see a wiring loom anywhere near the torque converter.
     
  10. rmllarue91

    rmllarue91 Senior Member

    Joined:
    Apr 17, 2014
    Messages:
    539
    Occupation:
    field technician
    Location:
    northeast pa
  11. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Also does anyone know what would be the correct operating temp range ( in degrees ) for the torque converter/transmission ?

    I purchased this electronic engine/transmission temp reader and rigged it in the cab so I can see the exact temps while it works.

    While digging hard in pleasent cool weather :
    The engine sits between 75-80°C
    ( temp Sensor bolted to the thermostat cover on left side head )

    The Torque converter is between 95 - 98 °C
    ( temp sensor bolted to same spot the oil cooler pipe leaves torque converter)

    https://www.ebay.com.au/itm/WATCHDO...375385?hash=item2163afa1d9:g:-g0AAOSwk5FUryTS
     
  12. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Not sure but from memory, this looks like a different torque converter than mine.....I will see it again this afternoon.
     
  13. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    As for the converter look at this picture, I rotated it so it should look like what you would see when sitting on the left rear tyre. Just for sake of keeping terms somewhat straight when referring to locations on a machine there are in relation to the operator sitting in the operators seat. The one main exception to the rule(there is always an exception right?) the right and left of a motor is while you are standing at the flywheel end of the engine looking toward the fan end, so yes the right side of the engine is on the left side of the machine!

    Anyhow here is the picture that I marked with some colored stars. 988B converter.png
    Blue star is on the top of the converter
    Red star is on the solenoid the two terminals are not easy to see but one is above the star and the other below the star.
    Green star in covering the hole the control cable goes in, that would be the cable that is connected to the handle behind the hoist and bucket levers in cab.
     
  14. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    I took way too long to find information on the temp but finally found something:
    988B converter temp.png
    If text at the bottom is hard to read it says "The indicator arrow will be in green area 33.5ºC to 129ºC, during normal operation. So if you are running in the 95º to 98ºC range I'd say you are good.
     
  15. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    Thanks kshansen.....as always, brilliant infomation. ( almost broke my brain trying to find that info )
    As I suspected someone must have removed the vctc solinoid as there is none at all on my torque converter in the location that you have marked with the red star.
     
  16. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    20200804_213727.jpg What is the part that has the red circle around it in this pic ? .......
    The torque converter on my 988b doesnt have this part .... or .... the solenoid....or any wiring for them.
     
  17. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    I'm hitting a dead end! SIS is only showing parts break downs for the 988B so trying to get any good information is a problem.

    Not sure what that part is that you have circled, I seem to recall that the valve it is mounted to is valve that controls flow to the converter cooler.

    Any chance of some pictures of you converter?

    Is this what the converter looks like on your 988B? Note that this picture is out of a 988 not 988B manual!
    988 converter01.jpg

    The solenoid for the "full torque" can be seen just a bit below and to the right of the plug for the "F" pressure tap.
     
    Last edited: Aug 4, 2020
    DMiller likes this.
  18. Cmark

    Cmark Senior Member

    Joined:
    Jan 2, 2009
    Messages:
    2,400
    Location:
    Australia
    That thing circled in red is a temperature sensor.
     
    kshansen and ajginger like this.
  19. kshansen

    kshansen Senior Member

    Joined:
    Mar 11, 2012
    Messages:
    8,273
    Occupation:
    Retired Mechanic in Stone Quarry
    Location:
    Central New York, USA
    Okay must be a different s/n range than I'm familiar with as the ones I recall were like this #3 in the poor picture from SIS below:
    sender.png
    and one more lousy picture from SIS:

    sender01.jpg
    Sender is between the two bolt holes at the bottom of picture!
     
  20. ajginger

    ajginger Well-Known Member

    Joined:
    Feb 24, 2020
    Messages:
    105
    Location:
    Australia
    The solenoid that I have been sent from cat has to be screwd into an opening of around 1inch diameter.

    I cant exactly get a good pic of the torque converter at the moment as its hidden behind dust caked oil ( oil spill ) & what seems like a hundred different pipes going in all different directions.