Excessive pressure will put stress on the
seals and packings causing premature failure.
valves can be adjusted up to the pressure they are designed for, providing you
have the pump and horsepower to reach that pressure. If your unloader is
sized to your machine then it's likely you do not have your unloader
Unfortunately many manufacturers simply do not care what
unloader the put on their machines so you could have an unloader that can be
over-adjusted. When you see the over adjustment is when the pump is on
bypass and you have a trapped pressure (hard), unloader. This is not an
issue with a flow (soft) unloader.
For more discussion on various unloaders click here.
With a hard unloader
you should set the pressure with the trigger pulled and machine running at
operating speed. Turn the unloader valve counterclockwise all the
way. This will reduce the pressure to almost zero. Then turn it
clockwise to the desired pressure. When you release the trigger the
pressure should spike to approximately 300 PSI more than what you set it
for. If the pressure spikes beyond that then the unloader is set too
high, for the
unloader. You will need a pressure gauge do this.
For more discussion on pressure gauges click here.
see prices click here.
SOME OF THESE OPERATIONS CAN BE
EXTREMELY DANGEROUS. IF YOU DO NOT HAVE SUFFICIENT TRAINING IN THESE PROCEDURES, WE RECOMMEND YOU
SEEK ASSISTANCE FROM A