Overdrive on the 740 TD 1986... Problèm

Discussion in 'Volvo 740' started by Bob rasowsky, Jun 27, 2006.

  1. Bob rasowsky

    Bob rasowsky Guest

    I changed the overdrive on my volvo 740 td 2 years ago.
    So, now I have an electric problem by pressing on the button of the control
    lever maybe a problem of bad contact on the relai...

    Has anybody an idea?
    the garage owners live in France are not véry good on this type of car !

    I am a French and sorry for my english writing
    Bob rasowsky, Jun 27, 2006
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  2. Bob rasowsky

    Duane Guest

    Is the transmission an automatic shift or or manual shift?

    Duane, Jun 27, 2006
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  3. Bad solder connections in the overdrive relay are common. The relay can be
    resoldered or replaced. Sometimes there are wiring problems (broken or short
    circuiting) but the relay is easy to try.

    Michael Pardee, Jun 28, 2006
  4. Bob rasowsky

    Bob rasowsky Guest

    The transmission is an manual shift.

    Bob rasowsky, Jun 29, 2006
  5. Bob rasowsky

    zencraps Guest

    Another problem in relays is that since Volvos last so long, carbon can
    build up on the electrical contacts, making them work intermittently or
    not at all.

    Very easy to remove: take the relay out of its case, soak a corner of
    white paper in electric contact cleaner, and rub this liquid soaked
    paper through the contacts several times.

    Look for smears of black carbon: if you see any, the cleaning was a
    zencraps, Jun 29, 2006
  6. Bob rasowsky

    Bob rasowsky Guest

    Thanks Mike,

    Tomorrow, I changed the overdrive relay, because I thinks it is this because
    when I fiddle with (touch) it, the red ligth on the board table can switch
    Also, I remake the solder in relay but without succes...

    Thanks a lot, Mike

    Bob rasowsky, Jun 29, 2006
  7. Bob rasowsky

    Bob rasowsky Guest

    Thanks a lot...

    I try that.
    Bob rasowsky, Jun 29, 2006
  8. Bob rasowsky

    Duane Guest

    A test:

    Ignition ON, Engine OFF, in 4th gear, Push Button. Dash light should go on.

    If dash light stays off with the first button push, pull shifter further to
    right and back, try push button again. If dash light goes on, change 4th
    gear switch on transmission.

    If dash light goes on with first push, leave on, get under car and check
    wires at solenoid on left side of overdrive. Removing wires off solenoid
    should make solenoid click with remove and put back on.

    Also, be sure transmission fluid is at bottom of fill plug on left side of
    transmission. Low fluid will not allow overdrive to engage.

    If there is power at solenoid because solenoid clicks when dash light goes
    on, there is a fluid problem inside the overdrive that needs to be fixed if
    the transmission fluid is full.

    Duane, Jun 29, 2006
  9. Bob rasowsky

    Bob rasowsky Guest

    Thanks Duane...
    Bob rasowsky, Jun 30, 2006
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