Jake wiring mechanical CAT

I have power going to the spade connectors on the side of the valve cover but the jake still won't come on any suggestions would be appreciated thank you

 

Pull the valve cover first check that wire from pass thru to soleniod is connected and has juice. If so start the engine on top of solenoid there is a "button" push it down jake should activate. I have also seen the wrong washers installed under Jake head cause it. The jake activates but due to excessive clearance the plungers don't contact the cross head. Last there is a tube drove into rocker shaft that supplies jake with oil. I have seen bad on rings to tube broken due to getting rough coming off.

 

So if the Jake's dont cut off when the brake pedal is pushed is that a problem in the brake switch? 87 359 pete

 

Why would you want the Jakes to cut off with the brake pedal, or did you mean the clutch pedal?

 

Jake shouldn't shut off when you hit the brakes. Be really stupid if it was setup that way.

 

Again mechanical engine they are on or off. The fuel pedal and clutch will kick them off however it will not idle with them on unless the clutch is depressed a little. Its best to flip them on and off as needed

 

Accidentally posted twice

 

I have a 1990 379 with a mechanical CAT. I had some work done on it and when I did the mechanic "turned it up a bit". A few days later I had noticed that when the dash switch is on the Jake's fire even when you step on the fuel pedal or the clutch. Is there a way to adjust the throttle switch? Would the mechanic turning the screws on the fuel pump throw this out of whack?

 

I don't know caterpillar engines, but Jake brakes all work the same on mechanical engines.

If you depress the clutch pedal and the Jake brakes continue to run you have a problem in the clutch switch. It is either bad or out of adjustment. Depressing the clutch pedal stops the electricity from going to the Jakes.

If the mechanic removed the linkage from the throttle shaft, it is possible that he altered the adjustment for the throttle switch. If you have to remove the linkage off of the throttle shaft to check it, make sure the throttle shaft comes completely totally to idle to where the shaft stops turning when you put the linkage back on.

There is a stop that is connected to the throttle linkage that bumps the switch for the jake brake. You have to loosen the lock nut and adjust it.

It has to come on only when you completely take your foot off of the pedal. A very small movement of the accelerator pedal will shut the Jakes off if it is adjusted correctly.