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Allison HT-754CRD fill tube?
I have a 1984 Liberty Coach 96″ with the 8V92TA Silver and Allison HT-754CRD. Do I just add the ATF through the transmission dipstick tube? It’s tucked back behind the engine electrical panel, so it seems there would be an easier way since it holds 8 gallons. My documentation for the bus is hit and miss, and I don’t have a good parts drawing for this transmission. Thanks!
1984 96" with 8V92TA
(remodeled Liberty Coach)
Greenwood, MO -
13 Replies
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By the way, not sure what’s up with my avatar. This is the second time it has switched to a different picture. No problem, since both times it has been a nicer coach. Reminds me of the time the shop accidentally put a twin-engine Baron back in my hangar after taking my single-engine Bonanza for service. Upgrade!
1999 XLV X-6872, liberty #440 -
I always filled my 755 through the dipstick tube.
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Chad,
Is this not your bus?
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Nope. She’s not mine, Tom. Must be a glitch in the Matrix. 🙂
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Thanks for the reply, Joel. I had a fitting on a hose to my transmission oil filter that was dripping a bit. I wasn’t sure how much oil I would lose fiddling with it, but it turned out to be a negligible amount. I was afraid I’d have to take the bed apart to get to another fill tube. It’d definitely be quicker to just be patient with the dipstick tube!
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Tom, it’s really not a big deal for me, but if it helps troubleshoot something in the system, here’s the image I was using:
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Send me your photo please and I’ll fix it.
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Chad, refill is through the fill tube, and checking the level using the dipstick in a fill tube is about as hard as asking folks in a restaurant to put away their phones.
If you need to check the level here is the preferred way although it is not very elegant. Locate the 1/8″ plug in the side of the transmission oil pan. With the engine cold and idling in neutral the oil should be just starting to come out of the hole the plug was in with the coach level.
Overfilling the 755 transmission causes it to run hot.
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Thanks, Jon. I’ve probably muddied the water a bit by calling the fill tube by the wrong name. It just seemed to me that its primary purpose was to check the level with the dipstick. I had to rebuild the transmission when I bought the coach, so I watch my oil temperature like a hawk and am pretty sensitive to drops of red oil.
My plan is to use a funnel and some tubing to add the oil to the fill tube when it becomes necessary. Is there a better way?
1984 96" with 8V92TA
(remodeled Liberty Coach)
Greenwood, MO -
That is the only way to fill either the 5 or 6 speed transmissions that I know of.
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I buy my oil in one gallon containers and use a hand pump and hose which is available either from the oil manufacturer or napa. The hose is clear and about 3/8″ diameter and fits inside the fill tube. The hand pump screws into the one gallon container. I use the same setup for coolant.
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That’s sounds like a better approach. I’ve been spoiled in the past by always pouring oil from a quart container – funnel optional. I’ve seen the pumps you described though.
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Another option is to fab a pressure vessel out of pvc tubing. I used six inch diameter tubing with a screw on cap at both ends, put an air chuck on the top cap and a barbed drain fitting on the bottom cap. Fill with oil, screw on top cap, clip on a ten psi shop air line, and let the air push the oil through a tube into the tranny fill neck. So, instead of saying I am lazy, I will say it keeps the blood in my arms better.
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