How do I change the washer on a Rotec Supertub tap

Check out this web site for free service manual with all infohttp://www.robinhood.co.nz/obsolete_product_downloads/Robinhood_ST1600_Parts_services.pdf

Turn off the water supply and strip the tap, fit a new washer.

If the tap is leaking replace the washer in hose end. It's a common garden hose washer. If you mean there is water in the tub your inlet water valve needs likely needs replaced.

Seems with your observation that the tub is out of shape and so it might be wobbling when it runs. So the only option is to change the tub with a new one but the cost must be confirmed to decide between a new tub or a new washer.
If you can get a salvaged tub it will be economical.

Your washer can develop several types of leaks. You can track down a leak based on when it occurs:

During fill only
During drain and spin only
All the time
During fill only If the washer leaks only during the fill cycle, check these:

• Air-gap device -The air gap is a small device found on most washers that prevents the wash water from being siphoned into the household water supply. It's located either mid-way along or at the end of the black rubber hose that comes from the water-inlet valve. Often it's made of translucent plastic. If one of the air-gap components deforms or cracks, you may need to replace it.



• The tube -There's a rubber tube that runs between the water-inlet valve and either the air-gap or the inlet spout. If it cracks or breaks, it can cause a leak.



• Inlet spout -Most washers have a plastic spout near the top of the main clothes tub that directs the water into the tub. If the spout cracks or breaks free of its mounting, it can cause a leak.

During drain and spin only A washer that leaks only during the spin cycle often has a leak in the main drain hose. Inspect the entire hose and correct any problem you find. Alternatively, the steel or plastic outer tubs can rust, split, or be punctured. This may be most visible during large loads and high water levels. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details.

All the time If the washer leaks all the time, check these:

• Hot and cold water fill hoses - Check the hot and cold water hoses from the household plumbing. If either hose is leaking, tighten it or replace it, as appropriate.



• Main tub seal - The main tub seal is located between the transmission and the outer tub. It's the primary water seal in the outer tub for the transmission-shaft entry point. If this seal leaks, you can see the leak by opening up the machine's main access panel while the machine is full of water with a small amount of detergent in it. The leak appears at the underside of the outer tub, at or near the center. This seal is difficult to replace. You probably should call a qualified appliance repair technician.



• Pump - If the pump leaks, you can probably spot the leak when the tub is full of water. The pump has two or more black rubber or plastic hoses attached to it and usually has a drive belt that spins the pump. If the pump is leaking, you need to replace it.



• Outer tub - Over time, the steel or plastic outer tubs can rust, split, or be punctured. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details.

The water level in a washing machine is determined by the pressure switch. The switch is located behind the load selector, water level, load size (has various names depending on model and manufacturer) knob on the operator console. If the switch malfunctions, the water will not shut off and the washer will overflow.

Now...before assuming the switch is defective, a common problem that occurs is the small air hose on the pressure switch coming loose or leaking. This air hose attaches from the wash tub to the pressure switch. The pressure swtich senses the change in air pressure as the tub fills and shuts the water off at the selected level. The following link explains:

http://www.fixya.com/support/r762094-washer_overflows

To access your pressure switch, unplug the washer and open the operator console. Look for a clear plastic hose. If it is NOT attached, you may have found your problem. Reconnect and test operate.

If it IS attached, check the entire length of the hose all the way to the wash tub for any cracks of leaks. In addition, remove the electrical connection(s) and check for corrosion. Clean if necessary.

If all these preliminary steps don't solve your problem, replace your pressure switch. Read through the link I provided and let me know if you have any questions. I hope you find this information helpful.

Check first if leaking from hoses or under the machine.
Undo your taps, check that the hoses rubber seals haven't worn out. Replace rubber seals, most hardware plumbing sections have them. Also if the actual tap is leaking at the wall, you will have to change the tappets. You will need to close your main water at the timer, then undo the actual knobs, depending on the tap. Once opened take out tappets and replace with copper ones rather than plastic. Then put all back together and switch water on and check if leaking. In case it is the washing machine, try to replace hose or the connector on the back of machine. Make sure also all rubber seals are replaced with new ones. If under machine you will need a plumber. See how you go!

It leaksYour washer can develop several types of leaks. You can track down a leak based on when it occurs: 

During fill only
During drain and spin only
All the time

During fill only
If the washer leaks only during the fill cycle, check these:

Air-gap device -The air gap is a small device found on most washers that prevents the wash water from being siphoned into the household water supply. It's located either mid-way along or at the end of the black rubber hose that comes from the water-inlet valve. Often it's made of translucent plastic. If one of the air-gap components deforms or cracks, you may need to replace it.


The tube -There's a rubber tube that runs between the water-inlet valve and either the air-gap or the inlet spout. If it cracks or breaks, it can cause a leak. 


Inlet spout -Most washers have a plastic spout near the top of the main clothes tub that directs the water into the tub. If the spout cracks or breaks free of its mounting, it can cause a leak. 



During drain and spin only
A washer that leaks only during the spin cycle often has a leak in the main drain hose. Inspect the entire hose and correct any problem you find. Alternatively, the steel or plastic outer tubs can rust, split, or be punctured. This may be most visible during large loads and high water levels. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details. 


All the time
If the washer leaks all the time, check these:

Hot and cold water fill hoses - Check the hot and cold water hoses from the household plumbing. If either hose is leaking, tighten it or replace it, as appropriate.


Main tub seal - The main tub seal is located between the transmission and the outer tub. It's the primary water seal in the outer tub for the transmission-shaft entry point. If this seal leaks, you can see the leak by opening up the machine's main access panel while the machine is full of water with a small amount of detergent in it. The leak appears at the underside of the outer tub, at or near the center. This seal is difficult to replace. You probably should call a qualified appliance repair technician. 


Pump - If the pump leaks, you can probably spot the leak when the tub is full of water. The pump has two or more black rubber or plastic hoses attached to it and usually has a drive belt that spins the pump. If the pump is leaking, you need to replace it. 


Outer tub - Over time, the steel or plastic outer tubs can rust, split, or be punctured. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details.

It leaksYour washer can develop several types of leaks. You can track down a leak based on when it occurs: 

During fill only
During drain and spin only
All the time

During fill only
If the washer leaks only during the fill cycle, check these:

Air-gap device -The air gap is a small device found on most washers that prevents the wash water from being siphoned into the household water supply. It's located either mid-way along or at the end of the black rubber hose that comes from the water-inlet valve. Often it's made of translucent plastic. If one of the air-gap components deforms or cracks, you may need to replace it.


The tube -There's a rubber tube that runs between the water-inlet valve and either the air-gap or the inlet spout. If it cracks or breaks, it can cause a leak. 


Inlet spout -Most washers have a plastic spout near the top of the main clothes tub that directs the water into the tub. If the spout cracks or breaks free of its mounting, it can cause a leak. 



During drain and spin only
A washer that leaks only during the spin cycle often has a leak in the main drain hose. Inspect the entire hose and correct any problem you find. Alternatively, the steel or plastic outer tubs can rust, split, or be punctured. This may be most visible during large loads and high water levels. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details. 


All the time
If the washer leaks all the time, check these:

Hot and cold water fill hoses - Check the hot and cold water hoses from the household plumbing. If either hose is leaking, tighten it or replace it, as appropriate.


Main tub seal - The main tub seal is located between the transmission and the outer tub. It's the primary water seal in the outer tub for the transmission-shaft entry point. If this seal leaks, you can see the leak by opening up the machine's main access panel while the machine is full of water with a small amount of detergent in it. The leak appears at the underside of the outer tub, at or near the center. This seal is difficult to replace. You probably should call a qualified appliance repair technician. 


Pump - If the pump leaks, you can probably spot the leak when the tub is full of water. The pump has two or more black rubber or plastic hoses attached to it and usually has a drive belt that spins the pump. If the pump is leaking, you need to replace it. 


Outer tub - Over time, the steel or plastic outer tubs can rust, split, or be punctured. If this happens, you may have to replace the entire outer tub--but that may not be an economical repair to make. Consult a qualified appliance repair technician for further details.

not a job for the amature, this could lead to other problems.