Tandemdrift

[Lastbil]

Hej !

När introducerades tandemdrift på Scania-Vabis lastfordon ?

Mvh Peter Ö

[Fredrik Klint]

Torde ha varit 1958 i samband med introduktionen av 75-serien, modellen hette LT75 (T = tandem), första årsmodell bör dock ha varit -59.

[Henrik K]

Var det inte -58 som LA82:an började utvecklas å den har ju tandem.

[Philippe]

I am probably not understanding everything right but here it goes

The LT75 exists and LT76 , I do know that there is significant differences between the Tandem of the LT76 and the LA82. I also know that the 110 had 4.93:1 Tandem axels, but I don't know if the LT76 / 75 ever had the 4.93:1 available, and if it is possible to change them to the LA82 LT75 LT76... I am seriously considering putting 4.93:1 in the LA82 for longer distances.

[Henrik K]

I am probably not understanding everything right but here it goes

The LT75 exists and LT76 , I do know that there is significant differences between the Tandem of the LT76 and the LA82. I also know that the 110 had 4.93:1 Tandem axels, but I don't know if the LT76 / 75 ever had the 4.93:1 available, and if it is possible to change them to the LA82 LT75 LT76... I am seriously considering putting 4.93:1 in the LA82 for longer distances.

The question is "what year was the introducition off Tandem Drive on Scania"

[Lars-Gunnar]

Philippe for you.

Lars wrote:

I continue on this tread with following ponderings and questions about use of tandem: I have discovered when use tandem they runs tough even when the truck not is loaded. For example one observe that the rear axles become orderly lukewarm despite it is winter, several degrees below zero and it should be relatively cold in the wind of the speed. That ought to mean one waste more of diesel than what is necessary when running on tandem. Is the cause I have an old truck or is it so here on more modern trucks too?

Philippe, did you notice that phenomena on your truck too? Is there little oil in the drive shaft?

Lars-Gunnar

[Philippe]

I am probably not understanding everything right but here it goes

The LT75 exists and LT76 , I do know that there is significant differences between the Tandem of the LT76 and the LA82. I also know that the 110 had 4.93:1 Tandem axels, but I don't know if the LT76 / 75 ever had the 4.93:1 available, and if it is possible to change them to the LA82 LT75 LT76... I am seriously considering putting 4.93:1 in the LA82 for longer distances.

The question is "what year was the introducition off Tandem Drive on Scania"

I know there is LT75 1962 and I know there is the LA82 1961. I will get some brochures from the 75 before 1960, and I hope to see the LT or no LT option available. I should get those within the next 2 weeks.

[Philippe]

Philippe for you.

Lars wrote:

I continue on this tread with following ponderings and questions about use of tandem: I have discovered when use tandem they runs tough even when the truck not is loaded. For example one observe that the rear axles become orderly lukewarm despite it is winter, several degrees below zero and it should be relatively cold in the wind of the speed. That ought to mean one waste more of diesel than what is necessary when running on tandem. Is the cause I have an old truck or is it so here on more modern trucks too?

Philippe, did you notice that phenomena on your truck too? Is there little oil in the drive shaft?

Lars-Gunnar

Haven't yet checked the greasing part of maintenance, the oil levels is fine for all my axels. My plan to save fuel was to remove the drive shaft for the last axle. This allows me to check the breaks (inspection) better and "maybe" save some fuel on the long trips. Radial vs Bias tire is about 0.5l/100km/tire, specially since I have now 13R22.5 instead of 11.00-20. The next big saving would be to find the 4.93:1 differential. The problem for the LA82 is to find it for the front axel differential too... So there is ways to save money on Tandem too. Just can't lift it in the air like the LS...

[Per Thomson]

Torde ha varit 1958 i samband med introduktionen av 75-serien, modellen hette LT75 (T = tandem), första årsmodell bör dock ha varit -59.

När vi talar om den civila produktionen är det rätt, den första innehades av Stora Kopparbergs Bergslag AB och var i testbruk redan innan 75-serien var officielt introduserad (1958)
Samma företag hade redan tidigare tandemdrivna Scanior, tror att det var Leyland boggier på dem och betckningen LT65 (eller möjligen LS65). Bilen var i grunden en LS61 med Regentmotor. Regenten (L71) var då ännu inte introducerad.

[Henrik K]

Vid besiktningen upptäckte jag en lustig sak med tandemdrivning och ej lyftbar boggi och det är att besiktningen inte kan kolla bromsarna Det kan väl kanske upplevas som en fördel eller möjligen en nackdel för de som vill kolla sina bromsar.

Gör dom inte en väg besiktning på bromsarna då?
Det gör dom ju med AWD personbilar där urkoppling inte finns.

[arnfinn]

Det är väl den mätningen som man möjligen kan uppleva som ett problem om man har en smula ojämna bromsar. Vilket jag haft vid något tillfälle. På andra fordon än denna.

Jeg tror du skal være glad for at det er så for jaggu kan det være krevende å holde gamle bremsesystem 100 % i perfekt kondisjon. Går bilen mye er behovet der for justering og går bilen lite får du f..n justere/rengjøre/smøre da også. Og aldri har du mulighet til å kontrollere dette før besiktning så det blir ofte 2 turer til besiktningen

[Per Thomson]

I am probably not understanding everything right but here it goes

The LT75 exists and LT76 , I do know that there is significant differences between the Tandem of the LT76 and the LA82. I also know that the 110 had 4.93:1 Tandem axels, but I don't know if the LT76 / 75 ever had the 4.93:1 available, and if it is possible to change them to the LA82 LT75 LT76... I am seriously considering putting 4.93:1 in the LA82 for longer distances.

The question is "what year was the introducition off Tandem Drive on Scania"

I know there is LT75 1962 and I know there is the LA82 1961. I will get some brochures from the 75 before 1960, and I hope to see the LT or no LT option available. I should get those within the next 2 weeks.

In a printed specification about civil Scania models it states that both LT75 and LT76 has rear gear RD82. That sorce don't tell about gearings. However I have a broschure for LT76 that states optitional gearings are 4,97:1 or 5,96:1. I don't know if we can trust this, it sounds a little bit strange for me as RD82 are a double gear and the ordinary double gears for LS76 are 4.93:1 or 5,91:1(RD75). Perhaps someone from Scania is reading this and can send us a comment.

[Philippe]

In a printed specification about civil Scania models it states that both LT75 and LT76 has rear gear RD82. That sorce don't tell about gearings. However I have a broschure for LT76 that states optitional gearings are 4,97:1 or 5,96:1. I don't know if we can trust this, it sounds a little bit strange for me as RD82 are a double gear and the ordinary double gears for LS76 are 4.93:1 or 5,91:1(RD75). Perhaps someone from Scania is reading this and can send us a comment.

What would the 4,97:1 differential be named ? The LA82 has RD82 differential. The other thing I was thinking was to add a divorced overdrive (weak) , or a gear splitter between the engine or the transmission(stronger). But I have never seen those on the Scanias.

4.97:1
General overview :
Cruise speed RPM 1939.63 rpm @ Km/h 80
Cruise RPM range 1200 to 1900
Gear low low 1st 92.99 :1
Min speed (L/L/1st) 1.32 Km/h
Max speed (h/h/8th) 90.74 Km/h @ RPM 2200
Max weight 90dg climb(L/L/1st) 14484.65 Kg
30deg 28969.3 Kg

5.96:1
General overview :
Cruise speed RPM 2035.24 rpm @ Km/h 70
Cruise RPM range 1200 to 1900
Gear low low 1st 111.52 :1
Min speed (L/L/1st) 1.10 Km/h
Max speed (h/h/8th) 75.67 Km/h @ RPM 2200
Max weight 90dg climb(L/L/1st) 17369.92 Kg
30deg 34739.84 Kg

PS:In this case there is gear splitter so H and L is 1:1, the 8th gear is the same as the 5th gear, Engine DS10R02 830Nm@1200, 13R22.5 Tires. anyone wanting this calculator.? just ask. I could make this for 11.00-20 if someone is interested.

[Per Thomson]

Is your calculator specific for LA82 or is it general?
With general I mean you have input variables for engine measures like nm and RPM, gearing means and such things.
Yes, I'm very interesting to get your calulator for 11.00 x 20.

[Philippe]

I have a lot of sample engines, transmissions, tires etc etc and you just pick what ever you need.
I used it a lot for land cruisers, and now for the Scania(s)

http://www.tchiwam.net/gallery/d/18823- ... 9d3e671372
There is a lot of just for fun calculators and some functions I used here and there. Enjoy and share. You will need openoffice to open it, I don't have excel You might need to change the _ for a .

For 11.00-20:
4.97
General overview :
Cruise speed RPM 2009.21 rpm @ Km/h 80
Cruise RPM range 1200 to 1700
Gear low low 1st 92.99 :1
Min speed (L/L/1st) 1.28 Km/h
Max speed (h/h/8th) 87.60 Km/h @ RPM 2200
Max weight 90dg climb(L/L/1st) 15004.26 Kg

5.96
General overview :
Cruise speed RPM 2108.25 rpm @ Km/h 70
Cruise RPM range 1200 to 1700
Gear low low 1st 111.52 :1
Min speed (L/L/1st) 1.06 Km/h
Max speed (h/h/8th) 73.05 Km/h @ RPM 2200
Max weight 90dg climb(L/L/1st) 17993.03 Kg


Philippe