General Discussion     Tech Questions     Parts & Services     Suggestions/Ideas     Help & Website Instructions     Blogs    

R model Mack specs


http://forums.aths.org/Topic23851.aspx
Print Topic | Close Window

By Bruce Ohnstad - Wednesday, August 27, 2008 3:24 AM
There's a nice RS 700 Mack wrecker picture posted, and described as having 3 speed rears.  Did Mack do that trick or are they vendor axles?  Was it Eaton that did that in the 1960s? 

The three speeds were obtained by running 2 speed axles, one high and one low, then spinning the interaxle differential, is that right?  How effective was that?

Also, what is the difference between straight R, RL and RS on Mack models?  My impression was that RL was light weight.  The RS and RL also seemed to have that sheet metal border around the radiator opening, where the R had the full opening.  Was that always the case?  Were all the R 700 models described as "Western"?

Also the 600 and 700 series seem to usually be 733 or 773 or something like that.  What did the second and third digit indicate?

Thanks,

Bruce

By Dan Bruno - Wednesday, August 27, 2008 4:05 AM
I think the Mack 3 speed axle you refer to was a special feature that used a 2 speed axle plus a manually engaged reduction gear used solely for pulling broken down Kenworths out of jobsites.  I hear this was a popular option in the far Northwest.

For all Mack models up to the late 80's, the last 2 digits of the model number refer to the engine.  If memory serves, there were at least 43 different model designations offered in the Western series alone over its production period from 1966 thorugh 1978. 

The R model is the eastern produced model.  It came in standard hood length (600 series) and extended hood length (700 series).  The eastern R models all had the same drop frame forward of the center of the steer axle and had a lower mounted cab.  The eastern R shared components and production lines with the F model cabovers.

The RS/RL series was the "Western" Mack series that was produced initially in Hayward CA, and then eventually Macungie after Hayward was closed in the early 80's.  The RS/RL initially started off as only a long hood 700 series, but the short hood 600 series joined in 1973.  Until late '72, the RS/RL shared the same hood as the eastern 700, although the cab and hood were mounted higher.  For '73, the hoods for the RS/RL were revamped with dropped fenders and remained unique to the Western models.  The "S" designated steel frame rails while the "L" meant aluminum frame rails.  In a model "RL700L" it meant a long hood western with aluminum frame rails.  The second "L" was in all of the Western models and stood for "lightweight components".  The RS/RL shared common components with the FS/FL cabovers and the early WS/WL cabovers.

In 1978, the RW Superliner replaced the long hood RS/RL700, although the short hood RS/RL600 continued through to 1990.  The RW shared common components with the W series cabovers.  The revamped Superliner 2's came out in 1984 with a number of frame mods and other updates.   Most visible on the outside were the square headlights.  Superliners ran until late 1993. 

R models ended in 1990, but popular demand kept the RD, RB and DM in production through 2005 for the RD and 2006 for the DM and RB.  I believe this 41 year run made the R model cab the longest running production cab in automotive history, surpassing the Ford/Budd C series cab and Autocar/Western Star cabs' long run

By glenn akers - Wednesday, August 27, 2008 4:29 AM
I would think that mack may have been a glider with that rear end set up and your info is correct on the 3 speed. I remember well about them because in my younger days working on trucks i saw a lot of them and the driver liked them. They was behind a 5 speed and it made a good even 15 spilts and the down side of them was there was a lot of maintence isuses with them over what we have now. They was shifted both into low for 1st and one into low and the other into hi for 2nd or intermedent as some was called and then for 3 or hi split both was shifted into hi. There was a straight air shift and there was a electric over air shift and never did see one but i am sure you could get straight electric shift. Years ago there was a trucking co. out of Dallas ( C H transportations ) Which was running all trucks with the 3 speed set up. I never under stood why they stayed so long with them because the RT road rander and 380 eaton rears as well as the SQHD rockwell rear was avaiable and was so much easy to maintain.
By John Woge - Wednesday, August 27, 2008 9:39 AM
Bruce,

  I took the photo you're talking about. It had an Eaton 3 speed shift knob...so I asked about it. The gentleman at the shop confirmed  it had 3 speed rears . Never saw a Maxidyne set up that way and was wondering if it was  factory. Mike H. might know.  

John 

By Freightrain - Wednesday, August 27, 2008 10:12 AM
Boy Dan..........you sure do spit out R model specs like you know sumthin 'bout them....:P

Hmmmmm:D

By MikeHarbison - Wednesday, August 27, 2008 10:41 AM
[quote]John Woge (8/27/2008)
Bruce,

  I took the photo you're talking about. It had an Eaton 3 speed shift knob...so I asked about it. The gentleman at the shop confirmed  it had 3 speed rears . Never saw a Maxidyne set up that way and was wondering if it was  factory. Mike H. might know.  

John [/quote

John built that truck from parts,the 3 speed rears weren't factory installed.

By Dan Bruno - Wednesday, August 27, 2008 4:18 PM
Where is the picture located?
By John Costley - Wednesday, August 27, 2008 9:54 PM
Dan Bruno (8/27/2008)
Where is the picture located?

Dan,

This forum, post titled " emeryvill owner " .John

By Bill D - Friday, August 29, 2008 4:51 PM
Here are some R Model Mack numbers and their engines:

R711 - ENDT673C Mack

R763 - NT 335 Cummins

R767 - NTC 350 Cummins

R769 - 318 Detroit 8-71

R771 - 12-71 Detroit

R785 - ENDT 675 Maxidyne

Anybody else have more to add to this list.

By Rob - Friday, August 29, 2008 5:13 PM
Bill D (8/29/2008)
Here are some R Model Mack numbers and their engines:

R711 - ENDT673C Mack

R763 - NT 335 Cummins

R767 - NTC 350 Cummins

R769 - 318 Detroit 8-71

R771 - 12-71 Detroit

R785 - ENDT 675 Maxidyne

Anybody else have more to add to this list.

R795 - ENDT 865 Maxidyne

R797 - ENDT 866 Thermodyne

RL755 - 1693TA Caterpillar

R685 - ENDT 675 Maxidyne

R686 - ENDT 676 Maxidyne

 

By MikeHarbison - Friday, August 29, 2008 5:23 PM
Bill D (8/29/2008)
Here are some R Model Mack numbers and their engines:

R711 - ENDT673C Mack

R763 - NT 335 Cummins

R767 - NTC 350 Cummins

R769 - 318 Detroit 8-71

R771 - 12-71 Detroit

R785 - ENDT 675 Maxidyne

Anybody else have more to add to this list.

One correction,Bill,the 318 was a R773,I believe the R769 was a 8V71T,but I can't find my cheat sheet to confirm it.

Here are a few more in the 700 series that I can think of.

R712 - ETAZ673 "300+" Mack

R715 - END864 V8 Mack

R719 - twin turbo ENDT864 V8 Mack

R786 - ENDT676 "300 series" Maxidyne

R795 - ENDT865 V8 Maxidyne

R797 - ENDT866 V8 Mack

R709 - END711 Mack

R747 - NTC290 Cummins

R788 - 350 Mack

R770 - 8V92 Detroit

By Bill D - Saturday, August 30, 2008 3:32 AM
Thanks Mike for the correction.  Here are a few more from a Motors Book.

R609 - EN 707 Mack gas

R640 - EN 540 Mack gas

R737 - NHC 250 Cummins

By Eddy Lucast - Saturday, August 30, 2008 4:18 AM
I think I have all the models listed. This should make it easier to check against your data.

F723 - ENDT864A

R401 - END475

R403 - END465C

R487 - ENDT475

R567 - END465D

R607 - END673P

R609 - EN 707 Mack gas

R640 - EN 540 Mack gas

R685 - ENDT 675 Maxidyne

R686 - ENDT 676 Maxidyne

R709 - END711 Mack

R711 - ENDT673C Mack

R712 - ETAZ673 "300+" Mack

R715 - END864 V8 Mack

R719 - twin turbo ENDT864 V8 Mack

R731 - NH 230 Cummins

R737 - NHC 250 Cummins

R747 - NTC290 Cummins

R763 - NT 335 Cummins

R767 - NTC 350 Cummins

R769 - 318 Detroit 8-71

R770 - 8V92 Detroit

R771 - 12-71 Detroit

R773 - 318 Detroit 8-71

R785 - ENDT 675 Maxidyne

R786 - ENDT676 "300 series" Maxidyne

R788 - 350 Mack

R795 - ENDT 865 Maxidyne

R797 - ENDT 866 Thermodyne

R797 - ENDT 866 V8 Mack

RL755 - 1693TA Caterpillar

By werkhorse - Saturday, August 30, 2008 11:17 PM
Here's what i've got straight from a 1969 Mack manual

R401 - END475

R403 - END465C

R487 - ENDT475

R567 - END465D

R607 - END673P

F723 - ENDT864A

By Eddy Lucast - Sunday, August 31, 2008 2:23 AM
werkhorse (8/31/2008)
Here's what i've got straight from a 1969 Mack manual

R401 - END475

R403 - END465C

R487 - ENDT475

R567 - END465D

R607 - END673P

F723 - ENDT864A

 

Added

By Dan Bruno - Sunday, August 31, 2008 9:42 AM
An R731 is for the Cummins NH230.
By Eddy Lucast - Sunday, August 31, 2008 9:55 AM
Added, including Bobs in the next reply.

Eddy Lucast (8/30/2008)
I think I have all the models listed. This should make it easier to check against your data.

F723 - ENDT864A

R401 - END475

R403 - END465C

R411 - EN414A 413 gas V-8 Dodge

R482 - 3208 Cat

R483 - 6V-53N Detroit

R487 - ENDT475

R493 - 555 Cummins

R567 - END465D

R607 - END673P

R609 - EN 707 Mack gas

R640 - EN 540 Mack gas

R679 - Detroit 6V-71N

R685 - ENDT 675 Maxidyne

R686 - ENDT 676 Maxidyne

R709 - END711 Mack

R711 - ENDT673C Mack

R712 - ETAZ673 "300+" Mack

R715 - END864 V8 Mack

R719 - twin turbo ENDT864 V8 Mack

R731 - NH 230 Cummins

R737 - NHC 250 Cummins

R747 - NTC290 Cummins

R763 - NT 335 Cummins

R767 - NTC 350 Cummins

R769 - 318 Detroit 8-71

R770 - 8V92 Detroit

R771 - 12-71 Detroit

R773 - 318 Detroit 8-71

R785 - ENDT 675 Maxidyne

R786 - ENDT676 "300 series" Maxidyne

R788 - 350 Mack

R795 - ENDT 865 Maxidyne

R797 - ENDT 866 Thermodyne

R797 - ENDT 866 V8 Mack

RL755 - 1693TA Caterpillar

By BobBray - Sunday, August 31, 2008 7:41 PM
How about these:

R-411.  EN414A (Dodge 413 gas V-8).

R-482.  Caterpillar 3208.

RS/L-483.  Detroit 6V-53N.

RS/L-493.  Cummins 555.

RS/L-679.  Detroit 6V-71N.