Lmackattack

the stick on the Right (aux) is basicly just used when your stoped on a steep grade or in some real thick mud and need a low gear to get started out. some people will use low with 1-2-3 on the main then shift into Direct. If your pulling a hill just stay in Direct. If you stop on that hill. put the aux into LOW and then 1st on the main untill the ground levels out and you can make the shift back to direct. and in case you did not know you also have 5 reverse gears

I will admit that I had to use 4th gear reverse to get to a spot in a field to get a load off. hard ground, slight incline, slick and wet in the rain. was a semi truck and the added drag from the trailer would stop the truck unless you had some wheel speed to keep it going. Boss was there and approved of the tactics. Sent his Peterbilts home that day and kept all the 6 speeds working. but I dont think I would try that in the sand with the axels bouncing!

If I read your first post correctly it sounds like the power divider was working fine? are you sure the switch is for a power divider or is it a diff lock? If the power divider was in for a long time you should have noticed that it might be lugging down in tighter turns. most noticeable on pavment. and yes if it was engaged it will be harder on the drive line as in a tight turn the forward tandem axel will move at a diffrent speed then the rear tandem. At least one wheel would have to slip across the ground to keep moving in a turn. For an example of how it would feel if it was locked in on dry pavement with a load on.. in a tight turn (1st gear) you likely would not get to 2nd gear becasue the truck would louse to much speed because of the friction and stress on the drive line.. but again it all depends how your diffs are set up.

If you had one wheel on the forward axel off the ground and one wheel of the rear axel off the ground you are stuck... with the power divider in or out.. your stuck (most of the times) . as said before the power divider just sends power to both axels. a power divider does not lock in the diffs to send power to both side of an axel. you need a diff lock to get the power equal across the axel. the automatic power divider locks in when it detects a diffrence in drive line speed. tha manual has to be operated with a switch. a diff lock will send power to both sides of the axel if so equipped. I think most trucks with a diff lock only have it on one axel this means that even with a diff lock you will only have 3 powered wheels if the truck weight on the rears is badly unbalanced. I know its a PITA to under stand on a message board LOL!!! the old trick with macks power divider when stuck was to tap/stab the brake pedal to stop the free spinning wheel and try to transfer the power to the other side. works sometimes but if your stuck bad your done Trent

Good luck tomorrow but remember once you start backing up and getting in/out just fine they will decide your truck will go where the others cant. then every time they see you coming you get to dump "over there" ie the soft spots LOL!!!!

HA HA!!! I feel your pain. they have a tracked machine stoping everyone in the mud. Go figure. Sounds like some of the guys near me. I never could understand why those operators stop a truck to have it move 10 feet to the left or right. Get in, get out, and be gone! why make it harder then it really is?

Can someone point me in the right direction here. Im thinking this might be able to be a Sticky when were done if we can get some good advice on what our old macks need when converting them over to spring brakes. I have done nothing more than simple air brake repairs and maintence before so alot of this is news to me I have a basic under standing how air brakes work but have little clue how the specific relay/valves get plumbed into the trucks system. The compressor,air tanks,Dryer,chambers are a no brainer but the tractor protection valve,treadle, relays, bob tail valve,quick release valve, check valve locations are confusing to follow as they all seam to intersect at some point. My under standing is that if there is 2 seaprate systems (service and Parking) then they should stay seaprate!!! but that looks like its not true? What im looking for is guidance to what these old trucks need to be plumbed correctly. I see on the bendix site that you have all sorts of options. I just want a simple set up that works and is easy to follow. My B model has no steer axel brakes but has spring brake /service chambers on the forward Rear tandem and service only on the Rear rear tandem. what im looking for is simplicity a treadle that only supplys to the rear of the truck and trailer axels dash valve that is simple like the bendix CV3 (yellow and red only) relay and quick release that stop the truck or park it. SIMPLICITY!!!! any help is great and start where you want? thanks Trent

last time I split some double rails we placed one end of the channels up aganst a tree and then used a bob cat to force long round blocks of wood inbetween. it took a few tries but at the halfway point they seaparated. I woudent use heat as they are likely just pinched from rust and the heat wont do much unless the rust works its way out.. I know you should not weld on frame rails but not sure if heating them is just as bad. i suspect it is not a good idea???? Trent

they can be a pita to split if the rust is bad. When the rails rust the inner rail tends to spread and pinch the outer rail. lots of prying to get it out sometimes, use a wedge and hammer it down the rail adding blocks behind it. hopefully once it starts coming out it will get easy. Trent

Whats up Brett Where have all those blue ford dump trucks been hiding. I dont see them running around anymore? I hauled for your dad a few times about 2 years ago. You might rememberme? I have the Black RS700L that brought you some dirt a while back? I think I droped it off for you in Wacounda?

double frames add strength to the truck. if its an off road truck the double frames often reduce the stress and twisting thus extending life of the frame. the down side is that rust can get inbetween the rails and spread them to the point where crossmember bolts snap. engine brakes help slow the truck and help maintain a safe speed on a downgrade. it allows you to use less of your service brake on a hill and extends service brake life, ruduces brake fade etc...

its been a while but I recall the jacobs being stornger than the dynatards on the 6 cyl macks. the truck that I drove with a dynatard would have slowed better if I tide a log to a chain and let it roll off the back of the truck. it was also a poorly maintaind truck so that could have alot to do with the performance? But like mentioned if the dynatard is holding you back fine why mess with it?

Why Are Truckers Like Dogs? They piss on tires, chase cars, live in a box, and once in a while get to bury the bone. What Do You Get When JB Hunt Leaves A Truck Stop? Two Parking Spaces!

Havent had time to work on my B model for almost a year. between driving around in my "new" 65 caddy I bought a few years ago and working on the RS700L I havent had time or money. So today I put in 2 used batterys (Free), jumped in the cab, throttle to the floor, turned the key, fired off on the first crank. gotta love the old dogs for how simple they are. I missed that bark Got the trunk of the caddy loaded with my tools and will be out wrenching on it this weekend. Trent

also some of the biker painters are doing up some old school bikes with some sort of new type of gold leaf. I dont know what it is but I have seen it on a few choppers

I could see it used as a bump starter thing but god thats a big risk to do with a mechnical engine with the engine stop cable in the run position. the truck could just take off or crush you. what about a trailer battery that was powered off this wire?

Sounds like a great idea. As always thanks for all the hard work you put into keeping the B model store and this message board going! Trent

pin striping and gold leafing is a lost art. I bought some brushes and played around with some ideas but am not ready to do work on someones truck. Best advice is ask some local hot rodders if they know of a local pin stripe guy. Hard to find but they are out there. alot of these guys can do the gold leaf as well. Good luck Trent

ask some of the hot rod guys (cars) some of the old hot rodders rebuild these found on old cars. I have a fairly recent rat rod mag somewhere with a write up on these shocks/dampers. IMO just put newer style shocks on them as they will do a better job controling the movement.

reminds me of the time I started my 87" suberban. Fired it up and drove out the driveway. turning onto the street I heard a god awful scream. thinking it was a bearing or belt going bad I turned the engine off, opend up the hood and saw a racon wraped in the fan belts. that was a mess. it was dead So I just drove back to the yard to get a pry bar to dislodge the thing. I felt bad but who the hell sleeps on a timing cover?

i like the K.I.S.S rule keep it simple stupid! LOL this is how I did my RS700L. I moved the in dash radio to a newer style overhead console

never fails.. do it your self and it gets fixed right i would talk to the manager about your bill! regardless..glad you found the issue and its fixed!

one of the duel movie and Convoy trucks were both rebuilt by a guy in St louis. I suspect the R600 in Mad max was totaled out and used for parts?

if for one year the US stopped paying for the world to get on with life. we would likely have the cash to fix all our countrys issues and in a way reset itself. Get rid of these BS programs that help other countrys and lets for once focus on our people. Once we get back on track we can offer help.. but limit it. I want to start seeing other countries do what we do. Close the door on Mexico and see how long they last without our help. that would be a slap right back at them..

the older maxidynes were measured in brake hp. Brake HP is measured at the flywheel and does not compensate for drivetrain losses. Trent