hello,

as this pump is 40 degrees the piston block always gets stuck in assembly or disassembly damaging pistons.

can somone suggest the right way to assemble that motor (or an asembly official guide would be great)
the regolar way of assembling does not work in tha model aperantly and i am tired fo causing damage to parts trying to get it right.

thank you

A2F's are a little tricky. Good luck trying to get repair info out of Rexroth. That has been my experience anyway. They used to go so far as to black out part numbers on parts duagrams.

Dissassembly:

You need:

a piece of pipe with an id large enough for the bearing assembly to freely fit through.
a piece of redi rod that will thread into the end of the shaft, longer than the pipe
a nut to fit the redi rod
a cross bar to fit across the pipe with a hole in the middle for the redi rod.

match mark end cap and remove
remove case drain fittings
remove snap ring for seal carrier
remove seal carrier
remove second snap ring if there is one
thread rod into shaft
install pipe over rod and up against housing, make sure the bore is centered
put cross bar over rod and up against pipe
run nut down the length of rod and snug everything up
tighten the nut up to draw the shaft assembly out
if it's tight, warm the housing up a bit
guide the barrel through from the back, so it doesn't hang up on anything
dismmatle shaft/bearing assy

assembly:

stand the preassembled shaft/bearing/pison/barrel assy up in a vice.
heat the housing up in an oven or parts washer
install the heated housing over the shaft assy. (you may need some help guiding the barrel through from the top.

you could try doing this horizontally, but I prefer vertical

If you do manage to get some "official info" be sure to send it my way. I'm an info junkie.

Once you have the bearing, shaft and pistons assembled, you can slide the cylider block and the whole assembly can be put to the housing vertically upward. If it is heavy, 250 cc above, you might need a small wire rope to help pull it upward. The shaft has a thread(I.D) where you can easily make some provision to pull it upward. Once you installed the piston/ block assembly, you have to meassure the allowable cylinder block height WRT the housing, making sure that when you put the pressure plate and cover, there should be a thrust. If the block is too high, you might need to shim it. Follow the rexroth shimming dimension.

The key here is to assemble the block to the piston/ shaft assembly and putting it all together to the housing upward.

Oh, yes Doug is right heat it up(the housing at bearing side... Lightly). Also remember to hold the block until it is in to the housing and the piston can't come out anymore then you can invert it and press it more to the max. I can't remember if I used a wire rope but once the shaft comes out, it is easy.

This message has been edited. Last edited by: maglub,

Hello

Looa at flint hydraulics you can download the data .

http://www.flinthydrostatics.c...pair_information.asp

regards Eugene