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Posted for "Christopher Zavatson" <Christopher.Zavatson@udlp.com>:
Larry,
Mike has deferred this one to me. We brought his pump to my hangar for
a spool valve reversal about a year ago. His was the third pump I had
come across with a reversed spool valve. Turning the spool valve around
is something you can do provided you have an impact wrench. Use the
attached JPG as a reference. Also, I always prefer to change out all
the seals when opening up a pump. Although, when we did Mike's pump we
reused all the old seals and it came out leak free. Seal kits can be
obtained from Oildyne. The first step is to remove the two large hex plugs. This requires the
torque wrench. These plugs are torqued to 50 ft-lb and there is no good
way of supporting the pump body if trying to use a standard wrench or
socket while applying this much torque. With the plugs removed a spring
and poppet valve will fall out of each side. You will then see the
check valve assembly in each hole. Through a hole at the base of the
check valve you can see the spool valve. In order to get it out you
must first remove the check valves. Use a punch or piece of heavy music
wire inserted through the hole at the base of either check valve and
push the spool valve against the opposite side check valve. Now use a
hammer on the punch to push both the spool and check valve out. This
will take some moderate force as the O-rings are very tight fitting. When the spool valve comes out you will see that it is not symmetric. The O-ring is off center and you can see the hole that allows the excess
fluid to drain back to the reservoir. If memory serves me correctly the
O-ring is supposed to be closest the high pressure port. Just in case,
note the direction when it comes out. I like to push the second check
valve out and check for burrs or any debris. I have in the past pulled
burrs out of the spool valve area that had broken off and gotten
trapped. Per Oildyne, use lots of petroleum jelly to lubricate the
parts prior to reassembly in reverse order. Again, this will take some
force as the O-rings are tight. I use various sized socket to help push
the part in place.
Hope this helps.
Chris Zavatson
N91CZ
L360 std
Please tell me it's a no brainer to reverse it on my work bench.
Would
love to here the gory details. Spare no text as I am a bear of a wee
little brain.
<<<
[The photo Chris sent along was pretty large so I've uploaded it to the LML website for access.... go to the bottom of the "Hydraulics.." page in the Attachments area to access it. I just didn't want to clog things up for the dial-up users out there.
<Marv> ]
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