|There are a number of ways your
pump can get damaged. There are also a number of ways to protect
your pump from these hazards.
Your first line of defense to protect your pump is to ensure
your water supply is clean. If debris enters the pump you could be
faced with cracked or scored plungers, prematurely worn seals, worn or
cracked valves, broken valve springs, scored pump cylinders, plugged
unloader valve and plugged nozzle. A myriad of problems that can
be prevented with a simple inexpensive water
So, you are working 50 feet away from your machine and you need
to move something out of the way or the neighbor wants to ask a
question. What do you do? Lay the wand down and move that
thing out of the way or carry on a conversation over the fence. If
it takes more that a few minutes your pump may have experienced serious
damage, due to overheating, by the time you pick up your wand and go
back to work.
Heat is your pump's biggest enemy and your pump generates a lot of
heat Your pump turns at a great rate. Most run between 1700
to 3400 times per minute! Manufacturers design pumps to be cooled
by the incoming cold water, which picks up a small amount of heat on
it's way through the internals and out the discharge (nozzle).
By closing the trigger you stop the water from going out the
discharge but you pump is still creating heat......with no place to
go. Your pump
is positive displacement design. When you shutoff the trigger
gun the water continues to be pumped. The unloader
valve is designed to redirect the flow from your hose to the inlet
side of the pump. This solves the problem of where the water goes
but creates a problem of the heat generated has no place to go.
Hence, the water heats up, potentially destroying your pump. Water
in the head of the pump can heat up to the boiling point, cracking
pistons, melting seals, warping the head melting orings. Time for
a new pump!
What to do?
- Never leave the pump on bypass for more than a few
- Shut your machine off rather than leave it on bypass.
- Pull the trigger once in a while to cool the pump with fresh,
- Ensure you pump has a thermal relief valve which is designed to
open, and let cold water in, at approximately 140 degrees F.
Don't rely on this valve too often. Once your pump reaches the
open temperature your pump seals may already be somewhat
damaged. Accumulation of seal damage will eventually ruin the
seals. Also, some thermal relief valves are a one-time disc
design, so once they open they are done and need replacement.
- Run your bypass water to the ground or a drain. This is a
very effective method, especially for those working a long distance
from the machine. Water goes through the pump, taking heat
with it, even when the trigger is released. It's a fairly
simple procedure to do but you need a pump with an external
bypass. Pumps with internal bypass can not be converted.
Pumps with external bypass will have a hose running from the
pressure side of the unloader to the inlet side of the pump.
Simply remove the hose from the inlet, seal the inlet with a brass
plug, tie the bypass hose to the machine so it won't fly around and
your done. You can put a garden hose fitting on the bypass
hose which makes it easy to run bypass water to a drain or garden
area. If water consumption is of a concern in you area you may
want to consider the extra water consumption as a concern.
This type of bypass set up is ideal for any system drawing wash
water from a tank as no water is wasted, it's simply returned to the