You have a lot of different high pressure hoses to choose from depending on the type of work you're doing. For example an occasionally used hose for washing house siding is going to be different from a hose that's used every day to pressure-wash concrete. Planning ahead with regard to the types of hoses you most often need will help you have the equipment on hand that you need for the job.
Most high pressure hoses can use hot or cold water at temperatures up to 300 degrees. Even with portable pressure washers, having a hose of the correct length is a big benefit when it comes to how efficiently you can do the job. Additionally, you have to match the pressure needed for the job to the hose you choose. Using a hose outside its pressure range is dangerous and can damage your entire pressure washer system.
Also consider the weight of the hose itself and your ability to handle it. Lighter hoses, when they can be used safely, can make the entire unit easier to guide across your target area. This is important for getting a good, consistent end result with pressure cleaning. The hose's flexibility and any ability to stretch are also important if you have to get to hard-to-reach spaces. Bend restrictors on both ends of a high pressure hose are practically a necessity to avoid annoying hose kinks that squeeze off the flow of water. You should also choose a hose that is designed to withstand any cleaning chemicals you may be using with it.
Selecting a pump repair kit is a matter of finding a supplier of pump repair kits and knowing the make and model of your pump. You'll need the model number and you'll need to be able to identify the faulty pump parts that need replacement. You should be able to go to pump supply websites and easily get a schematic drawing of the type of pump that you have based on model number. Then you'll usually find that there are a number of different repair kits available with different groupings of parts, so you can choose the one that has what you need.
If you're not sure what's wrong with your pump, it's not hard to find troubleshooting guides, and some symptoms point to some common problems. For example, an oil leak may indicate a worn crankcase piston rod, worn o-rings, or a bad bearing. Low pressure can indicate belt slippage, a stuck relief valve, or dirty inlet or discharge valves. Once you troubleshoot your pump, you can more readily determine what parts you'll need and what kind of repair kit to choose.