California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 14,987
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
I'm replacing the power steering cylinder on the Yanmar YM186D and have run into some mysteries. This Power Steering kit was dealer installed when the tractor was new in about 1985, and shows no signs of any work until my present project. I have the PS install manual.
1) The 'Out' hose from the proportioning valve is attached to the opposite side of the proportioning valve compared to the PS install manual. That valve's input line is where it belongs, first thing in series from the hydraulic pump. I had expected that valve would be directional.
2) Even stranger, there's a second proportioning valve loose under the floorboard in series with the loader - I think. It's an oily mess under there and I haven't traced the spaghetti-bowl mess of hydraulic lines yet. Only that first proportioning valve, installed in its proper location, is shown in the power steering install manual.
3) Power steering steals all the power from the loader or 3-point below 1k rpm, I always assumed this was unavoidable. But if things are configured wrong I may be able to improve this, in particular by bypassing that second undocumented proportioning valve.
I should note the PS manual shows how to configure it if there is a loader, which I have, so that isn't a reason for variance from the manual's diagrams.
Comments???? Any ideas why a dealer would install that factory-authorized kit differently from its manual and add a second (expensive?) proportioning valve?
1) The 'Out' hose from the proportioning valve is attached to the opposite side of the proportioning valve compared to the PS install manual. That valve's input line is where it belongs, first thing in series from the hydraulic pump. I had expected that valve would be directional.
2) Even stranger, there's a second proportioning valve loose under the floorboard in series with the loader - I think. It's an oily mess under there and I haven't traced the spaghetti-bowl mess of hydraulic lines yet. Only that first proportioning valve, installed in its proper location, is shown in the power steering install manual.
3) Power steering steals all the power from the loader or 3-point below 1k rpm, I always assumed this was unavoidable. But if things are configured wrong I may be able to improve this, in particular by bypassing that second undocumented proportioning valve.
I should note the PS manual shows how to configure it if there is a loader, which I have, so that isn't a reason for variance from the manual's diagrams.
Comments???? Any ideas why a dealer would install that factory-authorized kit differently from its manual and add a second (expensive?) proportioning valve?
