12-06-2017, 10:46 AM
History: There were a few pre-1993 Newells that had hydraulic levelers but the vast majority, probably 90-95% had air leveling only. As the coaches got heavier, the disadvantages of hydraulic levelers getting stuck in soft soil or hot asphalt pavement made air leveling more practical.
Newell primarily used the Allison HT 740 in conjunction with the Detroit 8V92 from 1984 through the first part of 1993 when the use of the HT 741 (the electronic version of the HT 740) started to appear. The Detroit Series 60 first appeared in Newells during the 1994 model year, likely with coach #464 being the first although some Newells built after that still had the 8V92 through #376, a 1995 model. Even after the Series 60 was added, some were built with the HT 741 4 speed and some with the Allison 6 speed World Transmission through at least #385. After that the Allison 6 speed was almost universal in Newells until 2005 when the Cat C-15 and the ZF 10, then ZF 12 speed transmissions were introduced. Although some Newells after that used the C-15 with derated torque with the Allison 6 speed World Transmission, it was late 2009 before the Allison regained primary usage in Newells. With coach #1405, a late 2010, Newell switched to the Cummins ISX which it uses today. To the best of my knowledge, all of the Cummins ISX engines were mated to the Allison 6 speed Transmission.
The 8V92's were more prone to overheating on long grades than the Series 60's so watching the coolant temperatures, keeping the rear radiator clean and keeping the rpm's up around 2,000 on long grades is more important especially when pulling heavy loads.
Newell primarily used the Allison HT 740 in conjunction with the Detroit 8V92 from 1984 through the first part of 1993 when the use of the HT 741 (the electronic version of the HT 740) started to appear. The Detroit Series 60 first appeared in Newells during the 1994 model year, likely with coach #464 being the first although some Newells built after that still had the 8V92 through #376, a 1995 model. Even after the Series 60 was added, some were built with the HT 741 4 speed and some with the Allison 6 speed World Transmission through at least #385. After that the Allison 6 speed was almost universal in Newells until 2005 when the Cat C-15 and the ZF 10, then ZF 12 speed transmissions were introduced. Although some Newells after that used the C-15 with derated torque with the Allison 6 speed World Transmission, it was late 2009 before the Allison regained primary usage in Newells. With coach #1405, a late 2010, Newell switched to the Cummins ISX which it uses today. To the best of my knowledge, all of the Cummins ISX engines were mated to the Allison 6 speed Transmission.
The 8V92's were more prone to overheating on long grades than the Series 60's so watching the coolant temperatures, keeping the rear radiator clean and keeping the rpm's up around 2,000 on long grades is more important especially when pulling heavy loads.