Terry Rinkes Posted November 12, 2020 Share Posted November 12, 2020 Has any one tried switching out the 50 weight that is recommended for a synthetic that is not thick when cold like amsoil Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/ Share on other sites More sharing options...
doubleclutchinweasel Posted November 12, 2020 Share Posted November 12, 2020 Not sure if this helps anything, but the range shift on the 15-speed Fuller I had did not want to shift when I first started the truck. I had to sit there in neutral and flip the hi-lo several times to get it to shift. Once it shifted, it was good for the rest of the day, even if it was cut off and restarted. This was a lot more noticeable when it was cold, and nowhere near as pronounced when it was hot. I believe I had a slave valve gummed up, preventing proper air flow to the shift cylinder. That truck had a little oil in the air system, and I believe that oil was causing the slave valve to be stubborn. These air-shifted puppies can be picky about clean/dry air. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463771 Share on other sites More sharing options...
Popular Post terry Posted November 12, 2020 Popular Post Share Posted November 12, 2020 On warm up put front box in gear and back in neutral, loosens everything up. terry 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463773 Share on other sites More sharing options...
fjh Posted November 12, 2020 Share Posted November 12, 2020 Also if you see oil oozing from the stick tower or out the breather vent you may want to oring your shift lid! Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463791 Share on other sites More sharing options...
Swishy Posted November 13, 2020 Share Posted November 13, 2020 Run the gear stik thru neutral on a split it frees up on any gear load cya Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463797 Share on other sites More sharing options...
mrsmackpaul Posted November 13, 2020 Share Posted November 13, 2020 When your talking cold, what sort of temp are you talking Cold in Australia is different than other places around the world As to the oil I cant advise if it's ok or not I would check the air pressure and make sure the regulators are working correctly I would as check the filter and the exhaust to make sure it is clear Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463798 Share on other sites More sharing options...
Popular Post BAD DOG Posted November 14, 2020 Popular Post Share Posted November 14, 2020 On 11/12/2020 at 10:04 AM, terry said: On warm up put front box in gear and back in neutral, loosens everything up. terry That’s exactly what you have to do . Back when I was running a 12 spd I used to go out start the truck put shifter button in neutral and the stick in 5th let the clutch out and go back in and have a coffee and read the newspaper . 3 Quote Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463846 Share on other sites More sharing options...
Freightrain Posted November 17, 2020 Share Posted November 17, 2020 I do that with my three boxes. Put triplex in gear and leave my aux in neutral to move things around while building air. 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/64901-splitter-does-not-shift-when-cold-on-mack-12-speed/#findComment-463948 Share on other sites More sharing options...
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