Remove the handle. Cut off the water supply! Remove the nut holding the stem in the faucet. Unscrew the stem. In the end is a screw and the old washer. Also inside the fauct is a seat that the washer must seal upon. That is generally replaceble or can be cleaned up in cronic leak situations.
Connection of the washer drain hose to the tub drain is very important. This will help prevent leaks for example.
It is best top replace the tub facet with the valve that are compatible to avoid leaks or the parts not fitting properly. Home Depot or Lowes should have the parts available.
You can run your discharge pipe from the washer into a laundry tub with the drain put in. After the wash cycle, the water will discharge from the washer into the laundry tub. Keep the water in there and replace the washer discharge pipe back into the usual drain. Let the washer run it's normal cycle. Take the clothes out and put them in the dryer or on the clothes line. The next step is the tricky part. You have to get a pump of some sort to put the discharged soapy water from the laundry tub back into the washer. This water will still be okay to wash the next set of clothes. I would wash the whites first, though. lol
typically a washer pump breaks. Replace it. How to replace a washer pump?
it has a motor in the base and that connects to front and rear washer jets.
There is the Haier HERHLP21E Portable Washer with Stainless Steel Tub.
Sounds like a venting problem. The washer is trying to push the water down the drain and the tub is an easier route. When it stops pumping, the washer drain become the vent and lets the air escape. You can try some drain cleaner in the tub and the washer drains. This may open it enough to help.
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The Haier HLP21E Top Load Washer weighs 37 pounds.
A "very old tub faucet" probably has a washer AND packing around the stem. Back off (open a little) the handle, remove the cap nut (the one the stem goes through that threads onto the faucet), this should do it. Replace the washer, wrap pipe thread around the stem (probably a good idea to touch up the seat while you're there) and reinstall.
umm i think it needs to be handwashed in the sink or tub