HC wrote:

Hello, all.

Here's what I have:

- 8 HP Briggs & Stratton IC engine
- Haldex/Barnes 16 GPM direct drive hydraulic pump
- Prince "Logsplitter" vavlve (like can be seen he
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_472_472?cm_sp=Customer%20driven-_-Recently%20Viewed-_-Product%20Page"
- 4 inch bore, 30 inch stroke cylinder
- 3.5 inch bore, 36 inch stroke cylinder

What works:
The engine, hydraulic pump, valve, and 4x30 cylinder are used as a log
splitter. Work great. No problems.

What does't work:
I disconnected the 4x30 cylinder and connected a 3.5 x 36 bore
cylinder for another project (with about 10 feet of hydraulic hose I
can use the logsplitter as a power supply for other hydraulic
projects, which is what I'm doing). Whereas on the logsplitter ram-
speed is not a concern, my current project is sensitive to ram speed.
When I move the handle of the spool slightly to move the ram at low
speed the ram moves very slowly, no problem, until it hits the load
and then the engine bogs and dies. However, when I move the handle to
full-open against the load the ram moves just fine, but way too fast
for my needs and control.

The problem is that I need to be able to control the speed of the
hydraulic ram in my current project but when I try to move the handle
of the vavle slightly, to move the ram slowly, it bogs the engine and
will kill it, under load.

It's got to be the valve or the pump, but I don't know enough about
these things to be sure which it is. I would guess the valve is the
problem, maybe restricting the fluid too much on partial
engagement....but I don't really understand the inner workings of
these things well enough to even form a theory.

Any help would be appreciated.

Thank you.

--HC

I suspect the valve is not set up for partial flows.

Cheap fix. An adjustable resrtictor. If it causes the valve to kick
off. you may need to plumb in a bypass that allows some fluid to be
tapped off for work, with the rest recirculating.

More expensive, you may find it best to aquire a more suitable valve,
and plumb it in for use with external hookups. Splitters, pretty much,
don't require a lot of fine control.

Cheers
Trevor Jones