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Old 06-23-2022, 12:04 AM   #1
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Found leak. Help 🥺

I uploaded picture. What is this box on driver's side behind front tire? It's where I found transmission fluid leaking. I added fluid and she's running terrible. It's like she's straining. Not a happy RV. Can't get appointment until July 6th. I'm terrified. What is the purpose of this box?
Words of encouragement?
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Old 06-23-2022, 06:15 AM   #2
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We need a better, clearer picture of what you are trying to show us. I can't make out any detail from the posted picture.

You say it's transmission fluid? I've been around cars, trucks, and RV's for most of my life. We owned a 1999 F-53 chassis and still own a 2013 F-53 chassis. Yes the transmission is in the vicinity but I can think of no reason there would be a box leaking fluid related to the automatic transmission unless it's transmission fluid leaking from a hose that is going up to an automatic transmission cooler towards the front of the RV.

When you say a "Box" could you mean a metal radiator or cooler of some type?

We do have a hydraulic pump that controls the lifting jacks in that area. That fluid might also be of the same color as automatic transmission fluid. If the transmission cooler hose is leaking it's a bit of an easy fix.

Did you check the tranny fluid with the engine running and the fluid hot? Those are two critical steps to accurately check the tranny fluid level.

Try to get us a better detailed picture to post. Try not to have too much sun light shining behind what we need to see.

Thanks,
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Old 06-23-2022, 06:35 AM   #3
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If you topped up the tranny fluid and checked it correctly that should have removed the fluid as an issue. If the tranny fluid is low enough to affect shifting filling it should fix any shifting issues. The low fluid should not affect the RV's engine running badly or poorly as you described. Those two issues should not be connected.

Proper diagnosis is more easily performed when specific symptoms are used to describe what you the owner are experiencing. The more precise the explained symptoms the more accurate the diagnosis. "Running terrible, straining and not a happy RV are not precise enough!!!
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Old 06-23-2022, 11:09 AM   #4
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Is what you are describing between the frame rails or on the outside? If you are saying it is behind the tire on the outside of the frame rails - there is nothing transmission related out there.

My guess is this is hydraulic jack related. Pump/reservoir, jack or a line that is leaking
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Old 06-23-2022, 11:39 AM   #5
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Looks like charcoal canister.. for evap. To collect fumes from gas tank.. to me.. but pictures is terrible.. sorry.. do you have make, model and yr of chassis.. ? Do you have scanner..? if not you need one.. many a/p stores rent tools free.. or can check.. you might need to clean egr or o2 sensors need replacement.. all a shot in dark.. always check fuel pressure.. tool rent for free.. and new plugs and wires..
Good luck and keep us posted
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Old 06-23-2022, 12:41 PM   #6
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That location on my 2011 fleetwood F53 is the hydro jack pump, which has red hydraulic fluid that looks just like transmission. (probably is trans fluid).
Also, if hydoboost is used on your coach, power steering fluid is pumped to brake booster (could also be red trans fluid)...


When you say you added fluid, was it to transmission, or to that box? Did you check transmission to see if low? was trans hot and level and engine running when you checked?

Was it running terrible before you added fluid?
Are you trying to fix a leak, or fix the rough running issue?


Really need some better pics no matter what...
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