7
HIGH SPEED CYLINDER OPERATION
It is important to understand the principle of how your high-speed crusher works. If you are
new to this type of equipment you should run the lid up and down a few times to get acquainted with
it. You will find it is totally different than standard speed crushers.
The speed is achieved through the use of 2-1\2” oil bypass valves (Please see illustration on
page 24) located on the main cylinders. It’s quite simple; a cylinder is always full of oil. The bypass
system transfers that oil between the top and bottom cylinder ports, eliminating the need to send oil
all the way back to the tank. The oil is transferred directly to the other end of the cylinder. This
means to raise or lower the lid we only need to move 5 gallons (rod area) of oil in or out of each
cylinder, not the full 32 gallons like the standard system
To raise the lid we take the 27 gallons of hydraulic oil that is in the top of the cylinder and
transfer it to the bottom through the 2.5” bypass valve, adding only 5 gallons of oil from the pump.
Now in about 8 seconds we have put 32 gallons in the bottom of the cylinder. Putting our actual
cylinder port oil flow at over 200 gallons per minute.
When you lower the lid, the oil in the bottom of the cylinder transfers to the top through the
bypass valve. Since there is more, oil in the bottom than the top only the excess 5 gallons goes back
to the tank. It will retract the full 8 feet in just 8 seconds. Putting our actual cylinder port oil flow at
over 200 gallons per minute.
When you raise the lid the bypass valve opens automatically, giving you high-speed operation
on the full up stroke.
The length of time the lid falls in high-speed mode is adjustable. When you lower the lid the
bypass valve will start to close, you can adjust how long it takes the valve to close using the needle
valve (Please see instructions on page 9 – illustration on 24 part # 8) located on the bottom port of the
bypass valve.
As an example you could set it to close in 4 seconds, this means the top lid will lower about 4
feet in the high-speed mode. After the valve closes the lid will slow to the standard speed.
If the lid can fall only 2 feet before landing on the load, it will just sit there for the additional
2 seconds until the valve closes, and then the crusher lid will operate at standard speed and pressure.
AGAIN: When the lid is coming down, you can adjust how far you want it to fall in the high-
speed mode. Using the needle valve to adjust the time is takes for the valve to close. Once closed the
cylinders work at standard speed and pressure.
NOTE: During the down stroke, the cylinders do not operate at high pressure in the high-
speed mode. Only when the bypass valve closes can the cylinders create high pressure.
You will create high pressure on the up stroke after the cylinders top out.
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