Re: Anyone familiar with early hydraulic steering systems?
- From: nospam.clare.nce@xxxxxxxxxxxxx
- Date: Sat, 24 Sep 2005 11:21:27 -0400
On Fri, 23 Sep 2005 23:52:31 -0500, "Don Young" <notme@xxxxxxxxxxxx>
wrote:
>Could you remove the high pressure hose from the cylinder or the low
>pressure return hose from the reservoir and stick the end back into the
>reservoir filler? Or maybe just into a clean bucket? Note that a gear pump
>works okay at slow speeds but a vane pump generally does not. A simple pump
>tester is a high pressure valve with a gage between the valve and the pump.
>Just throttle down the flow and see if the pressure builds up okay. Remember
>this system is normally free flow through the booster and pressure only
>builds up when the valves are shifted to divert flow into the cylinder.
>Don Young
>"Christopher Tidy" <cdt22NOSPAM@xxxxxxxxxxxxxx> wrote in message
>news:433388E0.5070901@xxxxxxxxxxxxxxxxx
>> Don Young wrote:
>>> If you can see inside the reservoir just check if oil flow is evident
>>> when the pump is operating and there is no force on the booster valves.
>>> There should be free flow through the booster when the valves are
>>> centralized. You might check the booster for free flow to the outlet port
>>> by using an air line at the inlet high pressure port, then for reduced
>>> flow and some piston force when the valve is shifted by applying steering
>>> effort. That should help localize the problem.
>>> Don Young
>>
>> Unfortunately I can't see inside the reservoir - the chassis is made from
>> hollow steel sections and these form the reservoir.
>>
>> Chris
>>
>
Is this an integral valve unit, or does it have a separate "tower" and
cyl?
Fron William Crouse's automotive Mechanics text -
In the linkage-type power steering gear the power cyl is not part of
the steering gear. Instead the booster cyl is connected to the
steering linkage. In addition, the valve assy is included in the
linkage, either as a separate unit or integrally with the cyl. In
operation the gear works exactly the same as mechanical steering, but
the end of the pitman arm is not connected directly to the linkage.
Instead, it connects to the valve assy. When the pitman arm moves, it
actuates the valve assy which directs oil to the booster cyl where it
is applied to one side or the other of the piston. The cvalve assembly
works very much like the valve in an inline power steering unit -
(early saginaw)
In straight ahead operation the spool is centered by one or more
centering springs, and the oil from the pump is applied evenly to both
sides of the cyl, cauasing a straight ahead "dead spot". When a turn
is made, the pitman arm pushes the spool off center, allowing oil to
flow into only one side of the cyl, and allowing the other side to
vent back, through the valve, to the pump reservoir.
The integral unit (tower and cyl combined) is very much like a rack
and pinion power steering unit, without the pinion.
.
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