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  1. #1
    New Member
    Join Date
    Jan 2012
    Posts
    3
    Tractor
    1960s Massey Ferguson 35 Deluxe

    Default MF 35 Hydraulic Pump rebuild

    Hey guys, I have my pump out and on the bench, I have replaced all of the o-rings everywhere, and the piston rings on the pump. But I cannot get the piston rings compressed enough to get them back into the valve chambers. What is the best way to do this?

    Thanks.

    J

  2. #2
    Veteran Member banjodunn's Avatar
    Join Date
    Jun 2008
    Posts
    1,258
    Location
    Oz

    Default Re: MF 35 Hydraulic Pump rebuild

    G'day remove the rings from the pistons and check them in the bore, I did one recently and had to file all the end gaps to get them in. Good luck



    Jon

  3. #3
    New Member
    Join Date
    Jan 2012
    Posts
    10
    Location
    houston texas
    Tractor
    1968 MF 135 & 49 8n ford

    Default Re: MF 35 Hydraulic Pump rebuild

    can you use a ring compressor similiar to the one that is used to do piston rings on an engine

  4. #4
    Platinum Member
    Join Date
    Apr 2009
    Posts
    516
    Location
    Western Wyoming

    Default Re: MF 35 Hydraulic Pump rebuild

    Baileys has a real nifty tool for small pistons.
    Bailey's - Piston Ring Clamp Set
    This works great on small engines such as chainsaws. Good luck!

  5. #5
    New Member
    Join Date
    Aug 2011
    Posts
    9
    Tractor
    Various

    Default Re: MF 35 Hydraulic Pump rebuild

    Quote Originally Posted by jtwthaxj View Post
    Hey guys, I have my pump out and on the bench, I have replaced all of the o-rings everywhere, and the piston rings on the pump. But I cannot get the piston rings compressed enough to get them back into the valve chambers. What is the best way to do this?

    Thanks.

    J
    should go in easily, just pinch with your fingers and apply gentle pressure, i have done thousands and they never cause a problem getting in. Good Luck

  6. #6
    Gold Member
    Join Date
    May 2012
    Posts
    295
    Location
    Gidgiegannup Springs, Western Australia
    Tractor
    Massey Ferguson 148 .Chamberlain Super 70. Caterpillar D4. Chamberlain 354 FEL.Toro 268 rideon kubota L2002fel

    Default Re: MF 35 Hydraulic Pump rebuild

    G'day jtwthaxj .
    Funny handle!!
    Step ONE, Never as has been suggested use a cylinder hone on the valve chambers if the chambers are scored or worn REPLACE them.
    Step two.Fit the both pistons to one chamber WITH THE MACHINED FACE OF THE PISTON FACING OUT,Use pair of internal circlip pliers and GENTLY Squeeze the ring ,using the circlip pliers you can see what you are doing normally as said the rings go in easily
    then gently pull one of the pistons out a little bit any one and put a 1/4 bolt between the piston and the valve chamber what this does is extend that piston a little bit and allows you to install one piston at a time then you wont break any rings.
    Next fit ALL O rings to the pump end plates this done oil and fit the pump camshaft then the camblock making sure it is the plain one with no grove.
    With the pistons and chambers assembled slide the osilator ring in between the two valve chambers with the arm facing down .
    Next fit the control valve spring tube as a complete assembly,then the other camblock with the grove making sure the oscilator ring fits in the grove,then the top end plate making sure ALL O RINGS are fitted install the retaining nuts/bolts and tighten.
    turn then pump round and reassemble the control valve using plenty of oil.
    Happy days.
    Hutch.
    .

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