Re: Re: Hot PSC steering pump
Roadyy said:
Turns out it is a closed center orbital. I guess I got burned on that hardline purchase. Guess I'm on the hunt for the right one now. I guess some people have to learn expensive lessons. Now to go home and throw it scrap pile so it doesn't happen to anyone else.
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How about converting a closed center to an open center?
I'll pay shipping on it if you are really gonna throw it in the scrap pile. I'd like to take it apart and look at it.
EDIT:
Found this:
http://mtu4wheelers.powweb.com/phpBB3/viewtopic.php?f=2&t=4853
http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/520l0066.pdf
You can convert a closed center to open center:
To convert a closed center hydraulic steering metering unit to an open center unit, follow these instructions using following pdf as a guide.
http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/520l0066.pdf
Take out the spool and sleeve from the housing (shown on page 3), keep it held together with the neutral position spring.
With the spool and sleeve together in the neutral position, mark the bottom set of holes in the sleeve onto the spool inside it (pressure input holes). to make sure these are the correct holes, apply air pressure to the pressure in line on the housing and feel which hole the air pressure comes out of inside the housing. this hole/groove should line up with these bottom holes on the sleeve when the sleeve is in the housing.
Once the pressure input holes are identified on the sleeve and marked onto the spool inside the sleeve, carefully press the spool out of the sleeve (remove cross pin from sleeve and spool also. page 9). using drill press and drill capable of drilling the hardened spool, drill holes through it where you marked on it earlier. You can probably drill these holes with the spool and sleeve put together if you would rather (may be more accurate).
If you do not have the tools to drill the holes out, you can grind a slot through the spool from the edge in till you reach you're holes you marked (i used a dremmel with one of the fine cut-off wheels on it to grind my slots into the spool.
When you are complete and you de-burred it and reassembled it, the holes (pressure in holes) should line up with the holes you drilled or slots you cut when the spool is in the neutral position. when you hold the sleeve and rotate the spool inside of it, the pressure holes will line up with different slots cut in the spool going to either the left pressure out or the right pressure out (depending which way you turn it.) should be good to go. if confused, i will try to get pics of my spool and sleeve to better illustrate.