I have a New Zealand built track loader with a vickers TA1919V20r pump, the charge pump pressure is 190psi, when you go forward the pump starts to rock that badly that it seems that the motor and pump are going to break of the engine mounts, if you drop the revs it most time stops rocking. Change filter checked suction line, checked relief valve, cleaned hydraulic tanks and I can not find a strainer on suction line to charge pump. any ideas cheers mic
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Halitrrax
- Thread starter mic
- Start date
Hi it is the hydrostatic pump, cavitation same noise on a demo pump on youtube, some one removed the original southcott pump and installed the vickers pump to the existing plumbing. The charge goes threw a valve block that does the curl and tilt [6 way bucket] then to a filter and finally into the hydro pump. The next thing I will do is run the charge straight to the filter them to the hydro pump. cheers mic
I have to ask, does this have mechanical linkage to the pumps? We had a similar problem on a machine where the linkage was mounted to the frame at one end and the engine and pumps floated on rubber mounts. The mounts got weak and stroking the pumps would cause the high pressure lines to flex and move the pumps opposite to the linkage, setting up an oscillation that kept getting worse until you let go of the controls. New stiffer mounts solved the problem.
Parts drawing
The attaches might helpView attachment TA1919V20 Application Guide.pdfView attachment TA1919V20 Parts.pdf
The attaches might helpView attachment TA1919V20 Application Guide.pdfView attachment TA1919V20 Parts.pdf
It has power to push up a fire pile and spin the tracks under load and does not get the cavitation rocking, seems to do it less in reverse does the design in general have the same characteristics as a ride on mower were the reverse speed is slower than the forward. The cavitation did not happen with it up on blocks, cheers mic
Replaced rubber mounts, fixed linkage dampers , re plumbed charge direct to pump, checked replenishing relief valves and springs 2 of the valves show signs of ware. Still rocks out off control if not careful, whole thing ran great for first 5mins then when the oil warms up off it goes, any idea
Look on page 18 of the catalog for suggested circuits. Speed or flow should be the same in both directions unless a stoke limiting slug has been installed in the reverse control piston bore. I have also attached the repair manual. Do you think that the engine/pump coupler could be worn to the point to cause your problem. The old Vickers pumps had a metal tag rivited to the housing. The last 10-15 years they used a stick on paper tag.
Thanks for the manuals, didn't have the overhaul manual. There is a second number stamped into mounting point TA1919V20R 20142896 I think that it is a part number replenish check valve has were on the needle on both sides of the pump, this could explain the forward reverse variation cheers
142896 = old assembly #02-142896 = TA1919V20 R 2 B R 09 C C 21. Look at page 18 of the catalog for what the model # means. You should have aftermarket sources in NZ or AU. I know there are sources in the US. Google the the model #. There should be a second line under the first line to give the complete model #.
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