The Problem With Every Hydraulic Test Bench

test rigOne of our members writes:

“I work for an aircraft ground servicing manufacturer and we test hydraulic flow for various restrictor check valve assemblies. We have a test bench that maxes out at 2500 psi and 20GPM, using a 30HP electric motor. We need to test a new restrictor that requires 3500psi and 26GPM. I was wondering if we could somehow leverage our existing equipment (with some modifications) to be able to do so, without having to purchase a new 60+ HP electric motor and a larger pump?”

This is a common dilemma for repair shops and other hydraulic test … continue reading »

One Thing You MUST Know About Hydraulic Accumulators

Bladder and diaphragm accumulatorGas-charged accumulators are a common feature of modern hydraulic systems. They carry out numerous functions, which include energy storage and reserve, leakage and thermal compensation, shock absorption and energy recovery. But while accumulators present a number of advantages in hydraulic system operation, and can provide many years of trouble-free service, they are a maintenance item.

For example, the correct gas pre-charge pressure must be maintained for proper functioning and optimum service life. And periodic inspection, testing and certification can be required by law, because hydraulic accumulators are pressure vessels.

To get a proper prospective on this issue, a hydraulic accumulator … continue reading »

The Counterfeit Parts Problem

SplitSlipperA10V-LoResA recent client consulted me about the failure of an axial piston pump. And based on my long experience working in hydraulic repair shops, the mode of failure was unusual. In fact, it was a type of failure I’ve never seen before. The slipper of just one of the 9 pistons had split clean in half–see inset pic. The other 8 piston slippers were in perfect condition. Normal ‘lift’ between piston ball and slipper socket, no signs of rolling onto their edges, no sign of been hammered onto the swash plate, retaining plate undamaged. Maybe you’ve seen this type of … continue reading »