| Author | Message | ||
| Dirk De Bakker (Kelvin12)
Registered Member Username: Kelvin12 Post Number: 20 Registered: 1-2010 Posted From: 124.169.2.179  Rating: N/A |
G'Day All, On the Allison auto, (HT750DR) in my case the electrical connections on the underside of the box, not sure if these are diagnostic test probes or as I was told the switch to cancel the jake switch after the trans. drops out of lock up. Would this be right, and does it need anything else to cancel the jake. I did receive some information where a low air pressure switch was also connected to these probes. If its electrical why does it need a low air pressure switch. My thinking if its electrical then it wouldn't need air. Can't find any reference to this switch at all in my workshop manual. Dirk | ||
| Jack Conrad (Jackconrad)
Registered Member Username: Jackconrad Post Number: 1392 Registered: 12-2000 Posted From: 71.3.72.124  Rating: N/A |
Dirk, I used a pressure switch on our 740, but ours is the non electronic version. Only wires on ours are for the neutral start switch (back-up light switch was removed from the transmission). We confirmed the lock-up test port by temporarily running a tube to the driver's area with a pressure gauge attached. Our manual showed lock-up pressure should be within 15 PSI of main line pressure (175 PSI). We installed a 65 PSI NO pressure switch. We use the 65 PSI because I already had it laying in the shop. Jack | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 1072 Registered: 8-2006 Posted From: 74.33.43.204 Rating: N/A |
If you have lines going to a solenoid on the bottom of a 750 dr that is a converter lock up to run a PTO | ||
| Dirk De Bakker (Kelvin12)
Registered Member Username: Kelvin12 Post Number: 21 Registered: 1-2010 Posted From: 124.169.2.179 Rating: N/A |
Jack, Yours might have been the one I heard about by the sounds of it. Luvrbus, There is no solenoid that I can see just a rubber female plug with two metal probes coming from it. The box was originally fitted with a PTO. Thanks again for the replies. Dirk | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 352 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
The other thing needed to cancel the Jake is a throttle position sensor. You don't want the Jake on with fuel going in the cylinders. | ||
| Dirk De Bakker (Kelvin12)
Registered Member Username: Kelvin12 Post Number: 22 Registered: 1-2010 Posted From: 124.149.32.143 Rating: N/A |
Mine is a manual motor, (formerly converted from a DDEC1) so no throttle position sensor. Dirk |