FASSI CRANE HYDRAULIC
PUMP FAILURE.
This is what could happened to a hydraulic pump used to provide oil for for more than one piece of equipment. In this case a tilt-tray and a Fassi crane.
The flow divider valve fitted supplied oil to the two different valve banks.
With this kind of set-up there is always the possibility that something can go wrong! ! ! !
This is especially the case when the pump is still running while one uses the divider valve.
As is depicted in the diagram below, oil is taken into the pump on one side and is forces to leave on the other side.
What happens when the oil cannot leave or get out?
Well we then we have a hydraulic lock.
Something has to let go.
When this happens, it almost always cost a lot of money!
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| Look carefully and you will see the crack through the metal casting of the pump housing. Notice that the crack is on the top end, the pressure end of the pump. |
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| This photo shows the extent of the crack, all the way round the pump. |
Find below a clip that explains how a gear pump works and what goes wrong when the oil entering the pump cannot leave. Something has to let GO!
The best and safest practice is to shut down or disable the pump before dividing the flow on any equipment fitted with a flow divider.
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