Turning the fuel up on the Mack. Governor work on Bosch APE fuel pump.

Fixed surge while driving and describes how the governor system works and how to adjust.

[@scrotiemcboogerballs1981]

Glad you found the problem and was able to fix it fairly easily yourself a shop would have charged you a arm and a leg and might not have fixed it the first time being it was that spring being a hair loose thanks for sharing hope you had a great memorial weekend I live in Indiana myself around Petersburg area it’s not too far from elnora where you got the injection pump

[@Recommended_by_Fred]

It’s a small world! I’m in the town of Bloomfield so I have been in Petersburg a lot of times. I’m at Elnora (White River Valley Antique Show.. weekend after Labor Day) every year. I need to find a few more shows between now and then to get my fix….

[@danielhutchinson6604]

Them Doggie motors were alright on flat ground, but lacked the ability to look at big hills without dropping several gears.

[@davidbowser2395]

Very educational for my behalf. Kinda makes me understand more of the old Bosch pumps that I have in my B models.

[@Recommended_by_Fred]

@@davidbowser2395 Thank you for the kind words! Injection pumps were always a mystery so I decided to dive in.

[@davidbowser2395]

@@Recommended_by_Fred could you do a video where you take apart the injector pump itself apart. Still trying to get mine freed up. All six of my injector plungers are stuck.

[@Recommended_by_Fred]

@@davidbowser2395 they like to stick when they sit, I ended up freeing mine up by tapping on the rack back and forth and spraying PB blaster in the pump bodies. There are different degrees of stuck mine might not have been too bad. I have loosened up several this way and they ran ok afterwards. The main takeaway is to tap, not clobber the rack. See what you can do, I could make a video of a tear down if you need it.

[@davidbowser2395]

@@Recommended_by_Fred please. I got my plungers freed up today but how do I know that my throttle works. I was able to get the shut off rack to move in an out but how do I know that throttle works too?

[@Recommended_by_Fred]

@@davidbowser2395 the plungers are connected to a geared rack. In the video you can see the plungers rotate and are move by the rack. The rack has the governor connected on one end and a cover on the other. As long as that is moving freely back and forth you should be good. There should be no drag on this at all, if there is keep lubricating and working it back and forth. When back on the truck, I would loosen the lines and see if it is pumping fuel out before trying to start. Just make sure you have the air intake off and make a stop block to cut the air from the engine in case it would try to over rev and run away. I always have my trusty 2x10 stop block handy,and a co2 fire extinguisher when starting engines that sit for a while.

[@kamusungu]

just recently bought a 59 mack with a stuck rack. hoping to get it freed up soon. Thanks for the video.

[@Recommended_by_Fred]

I have removed the large side cover and gently worked the the rack back and forth until it frees up. You can use your favorite “knock er loose” spray in there to help dissolve the old diesel that sticking the rack. Make sure to subscribe! I need all the help I can get!

[@d.hopkins7664]

Good video, I have the same problem with a 85’ r model.

[@Recommended_by_Fred]

Most of the time the spring the throttle lever is loose/broken. It will do the same thing and is on the outside of the governor. Mine was farther in the governor but had similar actions. Might concider to like and subscribe if you liked the video.. thank you!

[@user-tu6ug5vt4q]

Great video like the old Mack's to thanks for sharing 👍

[@Recommended_by_Fred]

Thank you! I’m glad you enjoyed it!

[@danielhutchinson6604]

We used a damper on the Throttle linkage to diminish the effects. It limited the ability to change gears quickly, but cut down on some of the surging in off road conditions. Picking up Bales in Fields can get rough.

[@fishpony1211]

You’re a legend thanks for the info. Lets see if i cant melt this engine lol

[@Recommended_by_Fred]

Thanks for the comment! If you have any problems let me know( email in the about area on the channel. Please subscribe for more Mack content!

[@ImDirtyDan96]

Been to Elnora many a times....did not know that truck belonged to you. Now ya need to do a video on shifting the duplex

[@Recommended_by_Fred]

That’s aunt B, because she’s part of the family! I’m not as smooth as most but I get it down the road. I plan on getting one of the boys to ride with me to video, and of course Oreo will have to go to, she likes to ride in the trucks just as much as the Caterpillar.

[@danielhutchinson6604]

Even a Quadraplex needs power to pull hills. The contemporary motors appear to have spoiled many drivers. I have banged my Noggin on the roof of several B models.

[@Recommended_by_Fred]

@@danielhutchinson6604 I don’t get into my b model I tend to wear it like a shirt! It’s pretty tight but alot of the east coast trucks of the day had small cabs too.

[@danielhutchinson6604]

@@Recommended_by_Fred K-100 cabs seem to have spoiled me. The ability to convince a Cummins to climb mountains at an early age, got me somewhat less impressed by Thermodyne power. They were pretty durable when treated properly, but like I say, they seemed better suited to Flatland running. Bill Elshultz of Twin City Freight fame had a dependable bunch of Red B Models. They had a G Model they put freight in for the Terminal I was working, it seemed to break down frequently. But as time went by I understood the Driver they spooned into the Cab of that Unit was usually located on a Bar Stool, and the other Trucks would wake Him up when He Pulled over for Naps. The B Models turned in pretty impressive miles with the Good Drivers who were working before the Boss allowed the Boy to assume controll of the outfit. The Kid bought some Astros. They went Broke in the 1980's as they expanded to reach the west coast.

[@Recommended_by_Fred]

@@danielhutchinson6604 I have some other trucks too, a mack b733. has a L model cab and a cummins with a supercharger on the side of the block. I haven't tackled that project and a 358 peterbilt with a 318 detroit 5 x4 and hendrickson rubber puck suspension. I agree that the b-61 was not a mountain truck, Mack had western models that had big cummins power and larger cabs. This truck ran from Chicago to Florida a lot. Monteagle was about the biggest hill it had to climb,

[@garrettodd4021]

Did you have part numbers for what you changed?

[@Recommended_by_Fred]

Sorry, I don’t. I used parts from a known good pump governor. If there is the least bit of play it will cause it to surge.