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After sitting for a few hours, days, or weeks I have this problem with the Motorhome. It is a 1999 Dutch Star Diesel Pusher, made by Newmar, with a 300 HP Cummins engine, six speed Allison transmission, Spartan Chassis, Mountain Master suspension.
As I start out, the transmission will shift, it seems very hard, from 1st to 2nd and on up to 4th gear. By hard, I mean the Rpm's go higher then when it shifts normal. The RPM goes all the way up to 2100 or sometimes 2200 RPM before shifting. Then when it gets into 4th gear it will not go any higher, I have tried up hills, down hills, load, no load, and it will not shift any higher. I also know it is not going to shift because the display number changes to "4" and will not change until slowing down, at 15 miles per HR, it will change back to 6. When it shifts correctly, the display always shows "6" and does not change. When shifting correctly, it will shift at about 1500 to 1600 Rpm's.
To get it to shift correctly, I have discovered that if I stop, shut the engine off, wait a few seconds and restart, it will shift correctly. I have taken the motorhome to a Certified Allison transmission Dealer and a Motorhome Certified Dealer. They have each charged me a lot of money and have not fixed the problem. To me it is like rebooting a computer and everything works fine. Any advice would be greatly appreciated. Thanks, Doane
As I start out, the transmission will shift, it seems very hard, from 1st to 2nd and on up to 4th gear. By hard, I mean the Rpm's go higher then when it shifts normal. The RPM goes all the way up to 2100 or sometimes 2200 RPM before shifting. Then when it gets into 4th gear it will not go any higher, I have tried up hills, down hills, load, no load, and it will not shift any higher. I also know it is not going to shift because the display number changes to "4" and will not change until slowing down, at 15 miles per HR, it will change back to 6. When it shifts correctly, the display always shows "6" and does not change. When shifting correctly, it will shift at about 1500 to 1600 Rpm's.
To get it to shift correctly, I have discovered that if I stop, shut the engine off, wait a few seconds and restart, it will shift correctly. I have taken the motorhome to a Certified Allison transmission Dealer and a Motorhome Certified Dealer. They have each charged me a lot of money and have not fixed the problem. To me it is like rebooting a computer and everything works fine. Any advice would be greatly appreciated. Thanks, Doane
