boronia wrote:The DGT had AEC underfloors in the 1960s with a crude form of "computer controlled" automated SCG gearbox.
boronia wrote:
When new the AECs started in first gear, but due to the rough change from 1 to 2, it was disconnected. Drivers were reluctant to select first unless the bus absolutely wouldn't take off on a hill, which must have done wonders for the gearboxes.
VIKing wrote:I used to travel to high school in the 2nd series ERT Worldmasters from Willoughby. The last time I travelled in one being driven as an auto was in December 1968. That was at that time the auto function was being disabled on these buses.
tonyp wrote: The Leopards would eat the hill with a load on, but when the Mercedes 0305 took over they would come to an exhausted halt on that hill and have to start off again in first gear. I don't recall what sort of transmission they had.
Denv12 wrote:Scania introduced their computer gear change back in the mid 1980s.It was called "CAG" for computer Aided Gear Change. Even though it had its benefits it also caused problems. I heard of Scania's breaking down at times.I dont think it was a popular option.And,I dont know if any Scania's had the standard ZF gearboxes fitted if a company didnt like the CAG.
Swift wrote:...which overcame that refusal to kick down to 1st...
Both Merc transmissions, as well as ZF Ecomats also occasionally suffered what some enthusiasts refer to as "Allisonitis"...
Little wonder Mercedes decided to turn to the ready made and proven ZF Ecomat series, rather than continue on with their own.
PoweredByCNG wrote:
Bet you didn't know that Mercedes-Benz W 3 and W 4 gearboxes were actually made by ZF!
Swift wrote:Was it a joint development between ZF and Mercedes Benz and ZF were then charged with building the boxes for Mercedes use?
PoweredByCNG wrote:Swift wrote:Was it a joint development between ZF and Mercedes Benz and ZF were then charged with building the boxes for Mercedes use?
I believe that the engineering was done in-house at Daimler-Benz with the production outsourced to ZF.
Swift wrote:I'm theorising Mercedes bit the bullet after the problems experienced with their computer controlled W3E110/112 series and realised the popularity of the ZF alternative.
I'm guessing the Renk Doromat was all Renk as they also engineered other propulsion systems like Voith do.
Was the later 4 speed Doromat computer controlled too?
PoweredByCNG wrote:I'm guessing the Renk Doromat was all Renk as they also engineered other propulsion systems like Voith do.
Was the later 4 speed Doromat computer controlled too?
To be honest, I'm not sure about Renk Doromat technology, as there isn't much documentation about them, even for those who actually own vehicles fitted with them!
Both Merc transmissions, as well as ZF Ecomats also occasionally suffered what some enthusiasts refer to as "Allisonitis"...
This is more often than not a mechanical issue, with the valve body, clutch packs or torque converter. Even Voith gearboxes can have this problem.
I have had the privilege to hear a recording of an MCW decker with Cummins engine in England, with this affliction in the Voith's second gear but with normal lock up on third and final gear. One of the best bus sound recordings I've heard.
Maladjusted wrote:Both RENK and Voith boxes 3 & 4 speed in MAN SL200s all had computers. BCC were making their own adaptations of these in the late 90's.
ZF after the 2HP45's had computers as well.
The 7 CAG boxed Scanias that Bayside/National had were apparently always giving trouble, even while they were being sold by Geof Philp at Bus Stop Sales and Service. They were a computer guided and aided manual shift gearbox.
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