| Author | Message | ||
| Rob King (Skykingrob)
Registered Member Username: Skykingrob Post Number: 49 Registered: 10-2006 Posted From: 72.161.21.232 Rating: N/A |
I have a 91 Prevost LeMirage XL over the road coach. It had a lower drivers floor and I raised it to make a level floor with the rest of the coach. In order to make the throttle linkage long enough, I welded a 9" piece of 1/4" rod onto the original throttle linkage (the part from the foot pedal to the throttle cable), which is the same amount I raised the drivers floor. Problem is, when I push the throttle pedal all the way to the stop, the engine revs but just enough to make the coach creep along maybe 1-2 mph on level ground. I don't have a tach I so can't tell you what the max rpm is. If the coach needs to go up a hill, forget it, it just won't move even with the throttle all the way to the stop. I called Prevost thinking maybe they could tell me the length of the throttle linkage for the motorhome version, which is a 9" raised driver floor, like I converted mine to from the over the road that I had. He searched and said both versions are the same length in the factory manual. Apparently, the way Prevost solved the raised driver floor to keep the linkage the same length for both versions was to move the pivot point for the throttle cable to a higher spot. Unfortunately, I can't do that. So the question is, is there an adjustment on the cable to compensate or do I just have to trial and error the length I need to weld in place until I get it right. If there is an adjustment, how do I do it? If I don't have a tach, is there something else to use to set max rpms with throttle cable at the stop. I have a mechanical 8V92 TA, with a mechanical throttle cable. Rob 91 Prevost LeMirage XL Missouri | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1631 Registered: 12-2000 Posted From: 67.182.48.162  Rating: N/A |
Rob - The easiest solution, altho it will be some work, is to replace the mechanical throttle linkage with an air throttle. They've been used on transit buses for years, and are extremely reliable. Nick at Nimco can fix you up with a used unit. Williams is the most commonly found manufacturer . FWIW & HTH. . .  | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 956 Registered: 7-2006 Posted From: 75.208.225.189 Rating: N/A |
RJ....would that work on my coach? Thanx. RCB | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 631 Registered: 3-2007 Posted From: 71.53.155.14  Rating: N/A |
Rob your engine has a mechanical governor on it and you shouldn't worry about overrevving except going down a hill in a lower gear. Air throttles will answer your problem very good. I have one on a 4905 and it is great. RC Yeah it will work on yours. Problem is running the air line to the back of the coach. Small line is all that is needed. | ||
| Josh McElhiney (Zcommanager)
Registered Member Username: Zcommanager Post Number: 73 Registered: 1-2009 Posted From: 75.187.41.177  Rating: N/A |
Gomer, RJ - Will air throttles work with manual transmissions? What benefits do they offer over mechanical throttles? Josh | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 632 Registered: 3-2007 Posted From: 71.53.155.14 Rating: N/A |
Josh and air throttle works like mechanical one except the just use air instead. You will like it once you get used to it. There are now fittings to grease and linkage to adjust once it is installed and set up. Gomer | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 633 Registered: 3-2007 Posted From: 71.53.155.14 Rating: N/A |
Let us try this again! Josh, an air throttle works like the mechanical linkage except it uses air. You will like it once you get used to it. There will not be any more fittings to grease and adjusting the linkage once you get it set up and adjusted. Whew! gomer | ||
| Len Silva (Lsilva)
Registered Member Username: Lsilva Post Number: 301 Registered: 12-2000 Posted From: 72.187.35.208  Rating: N/A |
Well, not quite. Air throttles have a slight delay which can make driving a stick just a little more difficult, especially down shifting. A hydraulic or mechanical is a better option as far as I'm concerned. I just don't like the feel of an air throttle. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1718 Registered: 10-2003 Posted From: 71.58.71.157  Rating: N/A |
You will have to get used to it. Till you get familiar with it, it will act like an on-off switch. Simple setup otherwise. If you want to stay with mechanical, Morse controls makes control cables of any length and capacity. They are teflon lined or something like that. Work extremely smooth. http://www.teleflexmarine.com/document/productpdf/document1002_5_1071.pdf | ||
| Josh McElhiney (Zcommanager)
Registered Member Username: Zcommanager Post Number: 74 Registered: 1-2009 Posted From: 75.187.41.177 Rating: N/A |
Thanks Guys! The slight delay is a concern I had with shifting - especially down shifting. A former colleague of mine had one on his 4905 and he loved it. But, he also had a V730 tranny in it...so no shifting! So I think I will look into what Morse Controls has to offer. Another question regarding the mechanical linkage.. Do they tend to "stiffen up" as the weather turns colder? I've noticed that my throttle pedal seems a little stiff when first starting out on colder days - especially if it has sat for a little while. Could it perhaps just need re-greased? The whole chassis was greased about 3K miles ago. Or might it just be a condition of owning a near 50 year old coach?? Josh | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 635 Registered: 3-2007 Posted From: 71.53.155.14 Rating: N/A |
Josh yeah they do! As All metal expands and contracts with temp. It is important to keep the cables,linkage and all other parts that move clean,and well lubricated. Another reason for the air throttle!!!! Gomer | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1719 Registered: 10-2003 Posted From: 71.58.71.157 Rating: N/A |
some of those factory throttle cables can be disconnected and removed from the housing. Clean with solvent and lubricate with a light non hardening when cold grease. Reinstall core back into housing. Makes it work like new. | ||
| Mike Eades (Mike4905)
Registered Member Username: Mike4905 Post Number: 197 Registered: 12-2000 Posted From: 70.127.150.40 Rating: N/A |
I had an air throttle with my 4905 with a stick. It took some getting use to, but worked great, then I put in a v730 and it worked even better. Mike4905 |