How To Tell If Your Hydraulic Machine Is Sick

Hydraulic Maint HandbookMy son Benjamin had glandular fever last year. He was quite sick and missed a month of school. At the height of the fever his temperature was 39C for 4 days straight. I know this because his very concerned mother was monitoring his temperature constantly. If you have children of your own you can imagine the relief on day 5 when his temperature finally started to go down.

When you think about it, it’s really handy that our body temperature is a quick and effective indicator of general health. These days you (or somebody else) can stick an electronic gizmo … continue reading »

How To Avoid Damage To Hydraulic Motors From ‘Temperature Shock’

radial piston motor failureA client recently asked me to investigate and solve a recurring problem on a diving bell launch and recovery system. The system comprised of a hydraulic power unit, a bell winch, an umbilical winch and a guide-wire winch.

To launch the bell, the guide-wire winch is used to lower a clump weight to the seabed (the guide wires prevent the bell from spinning during launch and recovery) and then the bell and its umbilical are launched using their respective winches.

After the divers have finished their shift on the seabed (usually 6-8 hours) the bell and its umbilical are recovered, … continue reading »

How To Avoid ‘Dry Starting’ Hydraulic Pumps

pressurized hydraulic systems are dangerousOne of our members wrote me with this question:

“I was subcontracted to remove a 30 GPM, 4000 PSI rated hydraulic pump from one plastic injection press and install into a similar hydraulic system for the same company.

The hydraulic pump and prime mover are both beside and below (approx 12″) the bottom of the reservoir; a “flooded inlet” design. AND, except for the ball valve at the tank port, there are no other restrictions.

The customer insisted that I fill the pump’s case; I did so, but assured him that except for the hydraulic reservoir being empty, the pump continue reading »