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Old 06-12-2017, 09:06 PM   #1
Mini-Skoolie
 
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Location: San Francisco
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Year: 1974
Coachwork: Crown
Chassis: Supercoach - Single Axle
Engine: Cummins NH-250, Fuller T-905M
Transmission oil For 5 speed Manual

Transmission is in a 1974 Crown with Cummins NH-250. Haven't yet found transmission ID. Anyone happen to know off hand? Trying to swing by and pick some up before parts shop closes.
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Old 06-12-2017, 09:18 PM   #2
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Is it a manual transmission with a high and low range? If so, I'd put money on it being a Roadranger. Your best bet on oil for one of those is 50W synthetic gear lube. You can use motor oil in them also, but the service interval on the synthetic gear lube is much, much longer.
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Old 06-12-2017, 09:20 PM   #3
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Join Date: Apr 2017
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Year: 1974
Coachwork: Crown
Chassis: Supercoach - Single Axle
Engine: Cummins NH-250, Fuller T-905M
Thanks Rameses. It's 5 speed with single speed diff.


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Old 06-12-2017, 09:28 PM   #4
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Good lord, I need some sleep. I just realized that's in the thread title.

The 5 speed manual that Crown used was also an Eaton Fuller, and the lube recommendations are the same.
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Old 06-12-2017, 09:30 PM   #5
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Year: 1974
Coachwork: Crown
Chassis: Supercoach - Single Axle
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Super. Many thanks. Would actually love to switch to RoadRanger some day- would that just drop in?


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Old 06-12-2017, 09:47 PM   #6
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I'm not 100% sure, but I'm pretty confident that's a direct swap.

I'll check on it and let you know tomorrow, if somebody else hasn't given you a definitive answer by then.
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Old 06-12-2017, 09:54 PM   #7
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Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
some people have used Royal purple.. esp if you are in a very cold climate and plan to drive the bus cold.. Manual transmissions can be a bear to shift when its super cold and theres 50 or 90 weight gear oil in it.
-Christopher
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Old 06-13-2017, 02:13 AM   #8
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Join Date: Apr 2017
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Year: 1974
Coachwork: Crown
Chassis: Supercoach - Single Axle
Engine: Cummins NH-250, Fuller T-905M
Got underneath this evening.
I've got a Fuller T-905.
Here's the manual: Eaton Transmission Service Manuals in PDF

Sometimes it shifts OK, but most of the time it's terrible. Haven't figured out when it's good yet - either it's slowly getting better since I bought it (maybe it sat for a while?), or it's better when it's cold. At idle in the parking spot tonight I could easily get in and out of 1st from neutral. Often, I can't. Basically I drive it like there's no clutch and match speeds exactly. As long as I drop into 1st while I'm still rolling at 3mph before coming to a complete stop I'm fine. Murder standing on that clutch pedal in rush hour though.

I had hoped it was just low on oil, but I checked tonight - it's full up to the plug. Looks dirty, but it's there (ok, just read the manual, they say just because you can touch oil, it's not necessarily the right level, needs to be at the plug. Will need to check again.)

two other things to note:
1) the clutch is way out of adjustment. Engages at the top 1" of the pedal travel. Doesn't slip - even on SF hills - but never driven a clutch that comes on strong only in the last 10% of travel.
2) The inspection cover on the bottom of the transmission is missing - looks like maybe weather got in there. Seems likely that's why the clutch won't fully disengage and something is dragging.

Need to do something as we're going to use it for a friends wedding in August - rural Sierra wedding, so rig has to be solid. Friend is a machinist, so that's handy. If it works out to install a 10 speed Roadranger, I love those things, and I would do that. Anyone have a rebuilt one lying around? Could put the Roadranger in and then rebuild the Fuller while it's out - because that sounds fun. Open to other simpler options, like just fixing the Fuller.

Thinking some about how to do it. Thinking I might weld a steel frame inside and lift it on a comealong. Could setup a bench inside and rebuild right there. Best would be have the Roadranger sitting on blocks inside ready to drop down. Might get it done in a weekend if I can figure out the clutch and it all comes apart.

Open to suggestions. Also looking for a place in the San Francisco Bay Area where I can park for a week or two while I do the job. Can't do work in the RV storage place I'm using.

Thanks,

Adam
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Old 06-13-2017, 02:53 AM   #9
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Year: 1974
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Chassis: Supercoach - Single Axle
Engine: Cummins NH-250, Fuller T-905M
or maybe I was doing it wrong.

this for a 10 speed, but maybe my five is the same, and is actually in fine shape.



had never heard of a clutch brake.
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Old 06-13-2017, 04:23 AM   #10
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Join Date: May 2009
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Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
I'm in the middle of changing a transmision as we speak, I use a harbor freight transmission jack. I lifted the trans in and out of my pickup truck using an engine hoist. I anchored come alongs, 10,000 lb ones on the bus frame to lift the trans enough to slide the jack under. Then I used slightly thinner ones to tie the trans to the jack. Now I'm ready to slide it in place. You need a trans jack so you can tilt and roll towards the engine. Just straps don't allow you to move the trans or to tilt it. You don't want to use the shaft as any support whatsoever
Christopher
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