There will come a time when you will need to change or, even replace the existing washing machine drain line, at first this might seem like it will be tough to do, but its really not. You will just need a few hand tools to to this and you should have everything you need within a standard tool box.
You Will Need Some Hand Tools
Basically you will need a pair of channel lock pliers, and a flat head screw driver, depending on what type of hose clamp is holding the hose onto the pump fitting. Please note that a washing machine is very heavy and if you feel you can not move it yourself or, even do the repair for any reason, it maybe best that you call a licensed plumber to help you do the job instead.
A licensed plumber can not only save you time and money but can help you avoid a dangerous accident if you don't do the job right yourself. So when in doubt always call a licensed professional plumber out.
Giving Yourself Some Room To Work
Pull the washing machine away from the wall a few inches so that you can fit your arm behind it, and see where the drain line connects to the bottom of the washing machine pump. Once you have the washing machine pulled out a little, see if you can get a hand back there. Now that you have enough room to work behind the unit you will want to locate the hose clamp on the bottom of the washing machine.
What you will want to do now is to remove that clamp and depending on what type of machine machine you have or, who installed it to begin with will depend on how your going to remove the clamps. There will either be a hose clamp that will loosen with a flat head screwdriver or, there will be a hose clamp that you will have to squeeze with a pair of channel locks to loosen it.
Removing & Replacing The New Washing Machine Hose
Once you have removed the hose clamp, you will want to slide the end of the hose that is connected to the bottom of the washing machine pump off of the pump nozzle. Now that the hose is disconnected from the bottom of the washing machine you can remove the other end of the hose from the p-trap or washing machine drain line and now your drain line is completely removed. To install or replace the new washing machine drain lie just follow these directions in the reverse order.