Any hydraulics experts?

[busa20]

I am replacing a diesel engine with a gas engine so I need a belt driven Power Steering pump in place of a gear driven pump. But the pumps I am finding are 3.5 GPM at 1200 PSI and I need 4 GPM at 2200 PSI. I have a pump on the Allison MT 643 transmission that is 20 GPM at 2200 PSI. Is there a valve to reduce the 20 GPM to 4 with the same PSI? The 20 GPM pump has # 12 lines coming off to feed a control valve, if I Tee off with a #4 or #6 line to feed the steering box would that do it, or do I need some kind of flow control valve? before you ask these Trans pumps come with Hyd oil OR ATF that run two 5" cylinders.

Thanks

 

[J_J]

Yes there are flow control valves. There are also belt driven gear hydraulic pumps to do what you want. A lot of the commercial trucks use them. I use one on my Power-Trac for steering and lift, 3 GPM at 2750 psi

https://www.surpluscenter.com/item.asp?UID=2009051116305755&item=9-1208&catname=hydraulic

http://baileynet.com/index.php?id=31&productcategory=1000008

Check #250-059 under GC gear pumps

 

[IceStationZebra]

You are forgetting about RPM. There is no such thing as a "20 gpm" pump, but there are 20gpm @ 2000rpm pumps. If you only need 4gpm the best thing to do is reduce the pump speed by ~1/4. (as pumps slow down the internal leakage gets worse, don't go to 1/5th) You can use flow control devices, but they add $$ and parasitic losses.

ISZ