wilbur

3 hours ago, masterwelder said:

My 2001 CH tractor, with a 427 motor- jake will cut out at about 1550 rpm and come back on around 1000 ~ 1100 and stay on till 8, 900.

Has all the “upgrades”...

I got tired of an intermittent jake and wired it direct off a toggle switch.  Jake works perfect. I’m thinking mine must be computer and or electrical.  

Truck has 1.2 million miles. Almost 40000 hours. Only rebuilt once at 600k.   

 

You wired right from the head to a switch bypassing the relays and clutch switch and dash switch.?  I did that for a test once ,but didnt leave it that way. The way you have it you can engage the jake with the throttle depressed and make a lot of smoke.

What did all this cost.?  Looks much better.

23 hours ago, 1965 said:

How it happens; my opinion;

majority of people don’t care, they’re at work to make 8hrs. & that’s it. Nobody has pride or cares anymore.

You hit the nail on the head. And i think its all from the unions protecting them. The Quarry i haul out of the loaders are the same way. They want to do as little as possible. They move the fastest when its their break time. And the longer they been there the worst they are.

Should be right under this panel.

Now that I think about it ,the lever moves a air cylinder which opens or closes the door. The air cylinder itself could of fell off.

If your saying if your at 1800rpms and activate the jake that it wont come on til the rpms drop to 1300.?   If so sounds like in the computer.  It should come on at any rpm above 8 or 900 rpm.   I have the same set up and mine does.  The oil lines and pump just make the Jake work harder. Has nothing to do about when it comes on.

The rod fell off that opens and closes the door.

If you buy a sleeve from stemco all you need to do is bore a straight hole. The sleeve is straight on the od and tapered on the id.  If you ream the axle at a taper where are you going to get an oversize pin.

Are they 1/4 turn sockets. I bought the sockets from e bay and wired them together and wired to my dash light wire which eliminated the circuit board. Been working a year now/

Thanks mack tech I have one on the way.

OK thanks that is the number I need Thanks 

10 hours ago, Hayseed said:

He'll remember to Open the tailgate in Future...........

probably not. I seen a guy do it 2 times in a row.

Dealership doesnt have any being too old.. Does your dealer have any ,? I could buy from them.?

For a 2000 460  I used to borrow the one from my dealer but they lent it out and is now missing. The cover was like a dark red or purple. Thanks

Thanks Jhancock appreciate it, but i wouldnt call 0.020 as being pretty close. Thanks again

It came to my dealer as a service bulletin, and I wrote the dimension in the mack service book but someone borrowed the book and i dont remember who. If anyone remembers the bulletin or where I could find it let me know. Thanks

There was a service bulletin a while back about the actuator pin adjusting screw for the valve yoke on a Jake brake engine . It gave a measurement and said to replace if below that measurement. I had it some where but cant find it.  0.980" comes to mind but not sure. Any body?

the sleeve is pressed in.

Stemco makes a sleeve for this.  You have to bore the axle and install the tapered sleeve which is straight on the od. and tapered on the id.

http://www.stemco.com/product/ape/            axle surgeon does this also but they are pricey.  normal price around here is 400 a side

Mine will read the code with the truck running.

On 5/27/2017 at 6:50 PM, Truck Shop said:

Too bad your not closer to me, I have lots of Conmet steer and drive axle hubs hub pilot. 

Truck Shop

Where you located.?

Thank you sir.

I think thats the file mack put in. But now I lost 0.5 miles per gallon. I would like to take the file out or overwrite it somehow to get my mileage back.  Thanks

I never use mine , I like to keep em confused, like the busses that drive with their flashers on. I hate school bus drivers.

Sure would appreciate if you could help. Thanks