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Message |
marvin pack (Gomer)
Registered Member
Username: Gomer
Post Number: 1
Registered: 3-2007
Posted From: 67.76.7.206
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 21, 2007 - 10:03 pm: | |
can anyone help with proper operation sequence of the tranny and what does the foot switch on the floor at the driver do? |
Bob greenwood (Bob_greenwood)
Registered Member
Username: Bob_greenwood
Post Number: 777
Registered: 7-2006
Posted From: 64.136.49.228
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 21, 2007 - 10:19 pm: | |
wow.....I have a friend rhat loves that transmission....he no longer posposts on this board,,,,maybe I can get you two to yalk..... |
marvin pack (Gomer)
Registered Member
Username: Gomer
Post Number: 2
Registered: 3-2007
Posted From: 67.76.7.206
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 21, 2007 - 10:38 pm: | |
bob that wouldn't be b teal would it? I can't find him either |
Bob greenwood (Bob_greenwood)
Registered Member
Username: Bob_greenwood
Post Number: 778
Registered: 7-2006
Posted From: 64.136.49.228
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 22, 2007 - 7:22 am: | |
no......... this might piss him off....his email address is dongeneda@rgv.rr.com |
Steveggt (Steveggt)
Registered Member
Username: Steveggt
Post Number: 15
Registered: 12-2006
Posted From: 71.116.113.154
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 23, 2007 - 2:38 am: | |
Hi Marvin!
Proper shift sequence goes like this: You start off in first gear, commonly called "turbine". At a preset speed, everything locks-up and you're now in "direct". At a higher speed, you shift into "overdrive". With a standard setup, the turbine-direct shift is around 28, and the direct-overdrive shift is around 46.
If I recall correctly, when the buses were shipped from the factory, there was no way to "hold" the tranny in a desired gear. You either had a toggle switch on the dash with F-N-R (forward-neutral-reverse) i.e. air shift, or you had a lever on the floor with the same choices i.e. cable shift.
Many agencies/companies devised clever electrical/hydraulic ways to allow the driver to "hold" a gear, but these were usually controlled by with toggle switches mounted on the dashboard or on the left side driver's panel. A foot switch would work, but I've never seen one. On a 4905, the only foot switches I'm aware of are the high-low beam dimmer switch and the button for the air horn. I've occasionally seen a foot switch to control the public-address system.
Now let's get technical...with the VS2-8, I recall top speed being around 72 with the engine turning at 2100 rpm. You could get this speed with a standard-geared tranny coupled to a 6-1/7 differential. Interestingly, you got better performance (but the same top speed) if you chose the low-geared tranny (like on a San Francisco Muni transit fishbowl) coupled to a 5-1/6 differential! Third gear in the low-geared VS-2 wasn't technically an "overdrive". I think it's ratio was 1.04:1.
Hope this helps! - Steve |
Dan West (Utahclaimjumper)
Registered Member
Username: Utahclaimjumper
Post Number: 31
Registered: 1-2005
Posted From: 208.66.39.51
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 23, 2007 - 9:57 pm: | |
Thats very interesting Steve, I have the VS2-8 in my 4106 which normally has the 4and1/8 rear gears, with that set-up my coach would fly on the flats and was a dog on hills. I installed a 5.55 gear set and now it tops out at 85MPH at 2250 and does well on hills with propane injection (oops, dont tell anyone you heard that) >>>Dan |