03' Big Red

On 4/7/2024 at 12:09 PM, Geoff Weeks said:

Kinda begs the question, what is the intended use of the truck? If you plan on using the 58's to their fullest, then stay with 24" TT, if you are not, but are still going to load the truck, I think those 58's would be an albatross in terms of parts when on the road. If it is a "hobby" truck then the 24" tires will out last your lifetime, so again no reason to change.

 Seams like a whole lot of money to spend if you don't need too.

I like the 58’s as they ride much nicer than a 44 plus I get into some severe off road situations and like the idea of having the heavy rears to keep parts from breaking 

On 4/7/2024 at 4:22 PM, MACKS said:

I can’t say I have ever saw anything but spoke wheels on 58000 rears,I have 58000 on my cl and run 12R24.5 rubber,what’s the reason for trying to swap it out if you don’t mind me asking?

Ease of maintenance mostly 

On 4/7/2024 at 11:03 AM, JoeH said:

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.

I inquired about them and was told even though they are stud pilot they require a special rim and can only run 24” tube tires

On 4/29/2023 at 9:56 AM, 03' Big Red said:

I have two R models a 98 & 03

Both have oil leaks at the back of the engine AFTER the transmission has been out, rear structure resurfaced, new rear main seal and oil pans resealed. Any insight to what the problem may be?

 

The 98 was a cracked valve cover, pin hole in oil pan and rear main seal that was installed improperly 

The bearings are much larger and it takes a special hub not at all like 44-46000lb 

Thanks for the update,

it originally came with the 12r24 tube tires with 24” Dayton and was converted to 22” Dayton’s to run 11R24.5

i was thinking about changing it over to run hub/stud pilot but was told it required special rims and even then may be for the 12r24 tube tires.

I have a 1998 R model with the 58000 lb rears and would like to convert to hub pilot or stud pilot.

I’ve been told they take special rims due to the larger hub/cone assembly 

can someone give me some information about this ?

what would the correct rims be for this and could I run 24.5 tires ?

I’ve hear it’s only for the 11r 24 set up

44 minutes ago, 03' Big Red said:

Recently we installed injectors, rocker arms and shafts, camshaft,lifters and unit pumps 

trucks is 100% stock including exhaust manifold, turbo and injectors and it runs fabulous!!

if you down shift at 1300 it’ll stay in the power band and up shifting at 1750-1800 keeps things moving smoothly.

It will pull down to 1200 and keep on going 

we max out at 73280 lb here in PA  for a Tri Axle dump

This would be a 2003 RD686S that has the AMI 370 program 

On 11/1/2021 at 11:06 AM, Onyx610 said:

Correct, as with any transmission and clutch’s. Automatics are just a little more fragile with torque output. 

I disagree on the Allison HD4560 being fragile 

the are much more forgiving than a manual trans and can handle the horsepower without a issue 

Recently we installed injectors, rocker arms and shafts, camshaft,lifters and unit pumps 

trucks is 100% stock including exhaust manifold, turbo and injectors and it runs fabulous!!

if you down shift at 1300 it’ll stay in the power band and up shifting at 1750-1800 keeps things moving smoothly.

It will pull down to 1200 and keep on going 

we max out at 73280 lb here in PA  for a Tri Axle dump

On the 2003 the cause of “oil leak” was actually a over zealous national oil change shop that pumped way to muc grease into the throw out bearing

the 98 was leaking at air compressor, oil filter mount and looks like the rear main seal was damaged when it was installed 

22 hours ago, JoeH said:

If it's an auto then you probably have cracked flywheel housings.

It is a automatic in the 98

Flywheel housings on both trucks went to machine shop to be squared up.

not sure about cracks

On 4/29/2023 at 11:00 AM, 880joe said:

Possibly the rear cam plug 

I’ll look into that

I have two R models a 98 & 03

Both have oil leaks at the back of the engine AFTER the transmission has been out, rear structure resurfaced, new rear main seal and oil pans resealed. Any insight to what the problem may be?

On 9/15/2013 at 10:01 PM, Brocky said:

The sloped nose Giants had the air cooled Deutz engines in them. There was another construction outfit out of Harrisburg that had a lot of them also. Had a 4 letter name? KEMP?? Something like that

That was Hempt Bros 

some sloped nose had the Cummins M11

there is a single axle dump set up like that in my area.

I had a 88 Giant  Tri axle dump with a L10 Cummins,  7LL trans and 6:17 axle ratio. Not much would stop it but it was a slow truck. 
sure wish I still had it.

Can the CRD112/113 be made to be full locking? 
often the power divider isn’t enough 

I have a 2003 RD686S with the  AMI 370, can I put that software in a 1998 ECM RD688SX 

the 2003 has a Eaton the 1998 has a Allison, would that be a issue ?

i have 4-24 inch Dayton 6 spoke hubs (2 are ABS) for Mack 58,000 lb rear,all appear to be in good condition

P/N 8QJ530

2-24 inch Dayton 6 spoke w/ ABS for Mack 18,000lb steer, one is good,one shows wear due to rim slipping on hub

PN FZ196

message me for info

i am i need if a complete wiring diagram for a 1998 Mack rd 688 SX, also equipped with a Allison 4560.

my dash lights started flashing on and off then have smoke coming from the turn signal flasher unit...until i turn off the parking lights, then all is well.

my 03' also has a melted socket for the flasher, seems to me this may be a common issue.

thanks in advance for any help.

Dennis

What would the proper offset rim be to run a 425 22.5 steer on the front of a 98 RD 688SX ? 
the truck has Dayton 6 spoke hubs

UPDATE...

the 58,000 lb rides almost as nice as the 44000 lb in my 03 RD but much nicer with a load and running of road !

who woulda thought !!

Problem solved, we had to replace the VECM for other reasons and that solved the speedometer issue as well as the intermittent failure of the right turn signal.

They can’t help as it’s a Mack part installed by Mack when the truck was built

I have  a 98 Mack RD688SX  last part of vin is 040210 with a Allison 4560

i need a speed sensor, it screws into the LEFT side of tail housing The Mack P/N 

is 64MT-355M 

It is specific to 98-2000 Mack RD w/Allison

im hopeful that someone has a new or used one they can sell me as Mack says it’s obsolete 

15 hours ago, 6368 said:

Good to know that they will bolt in.  What about compatibility with different side gears and axles/splines?  Please share more info about which ones are the same.

i have  heard different, i was told they wont transfer over by a certain Mack specialized salvage yard...i am hopeful KT_Engineer is correct. that would surely make things much easier