[AT] Massey Ferguson power steering

[Dudley Rupert]

Len,

I didn't see any response to your' post and offer the following in the hope
that it might be of help in your' further diagnosis -

In attempting to gain a bit more information about your' power steering
problem at idle - and I am assuming here that you have no steering problem
when the RPM is up at say run speeds - you might start by measuring the pump
output pressure at both engine idle and say 2,000 RPM.

You could accomplish this by disconnecting the pressure line from the pump
output and then installing a pressure gage to this pump output followed by a
shut-off valve and then the pressure line reconnected to the output of the
shut-off valve.  After opening the shut-off valve start the tractor.  After
running the tractor for a sufficient period of time to ensure that the power
steering fluid is warm bring the tractor to idle and close the valve only
long enough to take a reading and then open the valve.  Now bring the
tractor up to say 2,000 RPM and close the valve again only long enough to
take a reading and then open the valve.

Learning what the pump pressures are at these two engine speeds will,
I,MMHO, be very helpful in determining where to look next.

Good luck -
Dudley
Snohomish, Washington

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of Len Rugen
Sent: Thursday, May 31, 2007 2:02 PM
To: tractor
Subject: [AT] Massey Ferguson power steering

My steering is very hard to turn at engine idle, is it probably the pump?

The tractor is a 255, about 1979 model with 2100 hours.  When I got it at
about 1500 hours, the pickup screen on the ps pump was damaged, so not
screening, so was replaced.  That's been 4-5 years, I noticed the steering
was a a little hard at idle this winter, but it's worse now even with the
warmer temps.

Thanks for any ideas?

Len Rugen

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