JoeH

Man such a difference in cultures. IDK what to think, lol. On the one hand "Atta Boy" to that 9 year old. But I've got a few nephews in that age range, and the thought of sending them on the road with the bickering they do with their siblings... IDK lol...

2003 MR688S, AI350 w/ Allison HD4560. Can anyone point me in the right direction on these ABS codes? Before the rollover I had no ABS codes, now post rollover I have 4. I'm guessing these primarily just mean I suddenly have 2 bad sensors... Posting this on my rollover thread under Modern Trucks, but I'm putting it here as well that's catch more eyes...

Can anyone point me in the right direction on these ABS codes? Before the rollover I had no ABS codes, now post rollover I have 4. I'm guessing these primarily just mean I suddenly have 2 bad sensors...

Cracks were both inside and outside the flywheel housing on mine IIRC. Leaks were internal I believe.

I've always thought a pallet jack would be the way to go.

Brief googling, the flashing 6 is probably because it has a shift inhibitor, it won't let you put it into drive while moving. So it locks you in neutral until the controller deems it safe to change shifter range. It probably had a drop in power that rebooted the transmission computer. Could be faulty wiring, weak circuit breaker/fuse contacts, drop in communication between different computers, etc. The shift display going blank makes me think the power supply dropped out briefly, shutting off the transmission controller. If your truck is anything like my MR688 with AI350 and an Allison HD4560, then the transmission should have a "clean power" (independent power supply directly off one of the batteries) supply via positive and negative wires that has a fuse in the battery box on the positive wire. Maybe you'll find fault with this wire. CleanPower means a power source independent of any other circuits, it's directly off the battery so the transmission has full battery voltage without possibility of voltage fluctuations from sharing power supply.

Being a two man company, I prefer Budds because brakes are much easier to replace by yourself. But on the roadside, a flat tire is much easier to replace with spoke hubs instead of Budds, if you have someone able to bring you a wheel and a lug wrench.

9" 22.5 budd rims are rated for 10,000 lbs. My MR688S has 315 duallies on the drives. Most 315's are rated for 10,000 lbs, so on a tandem axle with duallies you have 80,000 lbs of tire and rim capacity. That's plenty for 58k rears....

https://www.webbwheel.com/online_catalog_hubs.php Might be able to find hubs here

https://www.truckpaper.com/listing/for-sale/31897769/1987-mack-rd688sx-flatbed-trucks Nearest I could find, has budd front wheels, can't tell about the rear axles though....

https://truckpartsinventory.com/part-details/82219704/used-stud-pilot-budd-rear-wheel-end-spoke-hub-for-sale Pulled this off the googleweb. Haven't been able to find a P/N. Gonna hop on Truck Paper and look up RD/DM SX models and see if anyone has budds. Then you can pull a VIN off the truck,go to Mack and get drive hub part numbers.

How many miles and which auto trans is in it?

Dumb question, is the seal the problem? I have an etech ai350 that the old seal had popped out, we replaced it, still leaked! Pulled it apart, looked closer, and it turned out the aluminum flywheel housing was cracked from starter motor (10 o'clock) to the passenger side around 3 o'clock!

There is room for the GMC here in there other truck brand section. All our trucks are Mack's, except for a 1995 Ford L8000 single axle cab chassis we picked up for $2500 from a local oil delivery company I drove for briefly. We slapped a dump on it and a salt spreader a year or two later. The right truck is the right truck to come along at the right time.

Hydraulic pump hooked up, electrical plugged in, water tank installed... Hydraulics and electronics all functional, but we need to disassemble and clean out the cement metering augers as some humidity got in and hardened enough cement to cause problems. We had the driver empty out the main hopper of the cement bin back in November, but without being able to run the hydraulics back in the Fall we couldn't empty out the metering augers.

If humidity is an issue in your shop air you can run it the air through 20 to 30 ft of metal pipe before the air hits the hose, this should allow any humidity in the compressed air to condensate before it gets to the hose. You'll want a purge valve (just a regular ball valve) on a vertical drop of pipe near the air hose coupling to be able to blow any excess moisture out as it collects. Blowing moisture with you paint is horrible, I have to use the air hose on the far side of the garage from the compressor to paint. The air goes 40ft across the ceiling through a metal pipe then drops 12 ft down from the ceiling to the air hose connections. By the time the air gets to the hose there's negligible humidity in it.

Not sure what dents this cab has, I can't see any. If you know a good body guy that could moonlight a couple hours for you filling them in/sanding them down after work then you'd be well on your way to paint. *Dewaxing should happen right before primer and paint! Then don't touch it, the oils from your hands will transfer and cause fisheyes.

You can UTECH epoxy primer that thing and stick it outside in the rain for 10 years and you want have a spot of rust on it so long as you dewaxed everything so you dont have any fisheyes in the primer, and you managed to get every bit of metal covered.

The UTECH primer can be followed up shortly with paint, but if you wait more than I think a week it gets too hard for the paint to bond, so you'd have to scuff the primer down to give the paint something to stick to.

Build a paint booth out of poly plastic around that thing and get a painter in there and get some primer on that cab! Needs to be wiped down with a wax/degreaser removing solvent before priming. I use 2 coats of UTECH epoxy primer, and follow it up an hour later with UTECH single stage paint. Here's the booth I made in February in my shop to prep/paint a cab for a truck that rolled over in November. There's a cardboard filter box attached to a ventilator fan, blowing air through poly stapled to a 2x4. I put more filters at the discharge end of poly tube, and that caught some paint. No idea how much paint made it into the atmosphere, I was busy inside the booth while the filters were working! The old cab is on the left, it caught a tree on its way into the ditch.

Weak valve spring or over-revving the engine. Either will cause the valve to float, which could result in a bent rod.

Glad you got it working. I think you mentioned your system has fine mesh screens in the fittings. I could see this being the blockage point with cold hydraulic oil.

We got our truck with 415k miles, so no idea how it was from factory, but this is how it was routed when we bought it. "Push" function first T's into the passenger cab mount latch, then splits to go to tilt ram and the driver cab mount latch. "Pull" function just goes to retract the tilt ram. When the cab comes over center and starts coming down on its own weight it creates enough pressure on the "push" circuit to force the latches back open. Once the cab is seated, the springs on the latches hook the cab to keep it locked down. I assume your truck is the same way, but yours is 24 years older than mine. Not sure how the "push" circuit creates the resistance during "pull" function to open the latches, there may be a small orifice the oil has to pass through in order to return to the pump. Not sure why you're having the problem you're having! Something must be acting as a check valve somewhere, or the cylinder is binding!

Mixer mounted up, need to tighten mounting bolts and hook electrical plugs, hydraulic pump, water tank rebuild the mixing auger for the back... (worn from use, not collision) I'm also chasing an ABS code that is bugging me. Right steer abs cable ripped so I put a new sensor in, but still have a code. Gotta get this truck ready for inspection!

I think I have at least 3 different style sending units on my fleet.