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Old 05-08-2009, 08:51 PM   #1
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1974 27' Overlander
Puyallup , Washington
Join Date: Apr 2003
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Black Tank Removal Instructions

I was wondering if anyone has the directions for removing the black tank from a '74 Overlander rear bath (maybe a .pdf or image file?). I have a service manual, and unfortunately it's for a 1973. The black tank is different for that year. Any help would be greatly appreciated! Thanks!
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Old 05-08-2009, 11:31 PM   #2
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1993 21' Sovereign
Colfax , North Carolina
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It's really not bad. You need to remove the double elbow pipe that goes to the two dump valves (black and grey), then remove the black dump valve. It will be easier if you remove the sheet aluminum cover that goes over the valves where the handles are, just drill out the rivets. Remove the toilet, and unscrew the closet flange, it goes through the floor and screws into the top of the tank. Unplug the level sensors, they will be in the rear of the tank. You will need to drop the belly pan in the holding tank area, then you will find an angle iron-looking bar to the rear that is bolted in place. Support the tank housing, and remove the mounting bolts, then the bar. Check inside the trailer inside the streetside closet in the rear, you will find the vent pipe for the black tank. There may be a second one toward the rear of the tank as well. Make sure the vent pipes doesn't have any clamps holding them to the tank, then slowly lower the tank housing. It will lower from the rear first, as the front is hinged. Check the vent pipe to make sure the tank is sliding off the pipe. After you have lowered the back of the housing, you should be able to slide the tank out of the housing onto the ground, or just slide the entire thing out, if possible. If you slide the whole thing out, make sure you remove the hot air hose from the furnace that vents into the tank housing. Let me know if you need more instructions. My '74 service manual is in the trailer, so I am going by memory.
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Old 05-08-2009, 11:48 PM   #3
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1974 31' Sovereign
Ottawa , ON
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This is from the 1977 manual, maybe it will give you want you need:



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Old 05-09-2009, 05:13 AM   #4
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1974 27' Overlander
Puyallup , Washington
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Thank you both for the valuable info! This is exactly what I was looking for!
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