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Sundstrand 90 Series 55cc Swashplate Leveler Spring Seat and Servo Pressure Relief Valve Change

One of the changes made is that there will be shims go in between the swashplate leveler springs and the end cap in the pump. They have changed the leveler spring seats into a hardened piece, so there are two pieces now. Use to the seats were made into the leveler. This will make a …

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Sundstrand Series 90 Servo Arm Change

The new design is a press fit that goes into a groove in the new swashplate. It takes a special kind of machining for this so it will come as a kit. The parts are already assembled and used on 55, 75 and 100cc units. The parts will go in the vintage pumps. But the …

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Mini Electronic Cylinders and Different Types of Controllers

They may be mini in size but they are linear resistant transducers can tell the position of a cylinder and send out a signal to other electronics.These kinds of cylinders have a .002″ repeatability, 500 million inches of travel life, 5000 PSI, zero to 10DC response and they have side connectors that let you mount …

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What Makes Up A Cylinder

The parts that make up a cylinder are; body, pistons that move and the piston rod that is hooked to the piston. There are also end caps that are connected to the cylinder body barrel by way of threads, keeper rings, tie rods or a weld.  A rod gland is a cylinder rod that goes …

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Repairing Hydraulic Cylinders

Of course we all know when the hydraulics in the cylinders start to go out, makes our jobs alot harder. It is inevitable the seals will go out from everyday wear and tear, age and seals thinning out. Just don’t use it til you have erosion going on, will cost you more in the long …

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