Need help with Massey 135 Hydrauli Standpipe with Diverter Block (w/Pressure Control)

[klancf51]

Massey 135 Deluxe with IPTO. I have a hydraulic leak between the pressure control tube and the standpipe diverter block. I tried replacing the pressure tube O-ring, but it won't seal. Do the O-ring & backup washer fit into a recess in the diverter or should the pressure tube have a recess for the O-ring (like the standpipe)? Does anyone have the procedure for re-installing the standpipe with the diverter block? Specifically how do you keep the pressure tube tight to the diverter when locating the standpipe in the pump recess? It seems like lifting the standpipe breaks the seal with pressure tube. The manual and parts diagrams aren't very helpful for the standpipe with the diverter block. My pressure tube looks like the one in the attached drawing. Thanks!

 

[Mike476]

I just kept playing with mine, sorry that's not much help I know.

I did find it was easier to seat the standpipe in the block rather than in the pump, the last time I sat it in the pump first it looked like Niagra Falls spewing from the top of the standpipe, either that or the flow would be negligible.

 

[The kid]

Massey 135 Deluxe with IPTO. I have a hydraulic leak between the pressure control tube and the standpipe diverter block. I tried replacing the pressure tube O-ring, but it won't seal. Do the O-ring & backup washer fit into a recess in the diverter or should the pressure tube have a recess for the O-ring (like the standpipe)? Does anyone have the procedure for re-installing the standpipe with the diverter block? Specifically how do you keep the pressure tube tight to the diverter when locating the standpipe in the pump recess? It seems like lifting the standpipe breaks the seal with pressure tube. The manual and parts diagrams aren't very helpful for the standpipe with the diverter block. My pressure tube looks like the one in the attached drawing. Thanks! <img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=352358"/>

Shouldn't there be an O ring on both ends of that stand pipe?

 

[Mike476]

Yes, there is an o-ring on both ends,

 

[klancf51]

On Massey 135 with pressure control the standpipe is part number 883788M91 (note that this is different from standpipe 1869119M1 which does not have the diverter block). There are four (4) 0-rings associated with standpipe 883788M91: two (2) part number 195561M1 that seal the standpipe between the pump and the lift cover (i.e. "the O-ring on both ends of that stand pipe"), one (1) 195561M1 that seals the standpipe cap to the lift cover, and one (1) 359291X1 that seals the pressure tube to the diverter block on the standpipe - this is the O-ring that is leaking. I am asking about the procedure for installing the standpipe 883788M91, in particular how to connect the pressure tube to the diverter block.

 

[Mike476]

Like your manual my I&T doesn't provide a detailed installation process, suggest you "private message" shona13 to see if he has any helpful hints.

 

[shona13]

G'Day klancf51.
The seal you are dealing with is not an "O" ring but rather a Quadring , Rectangular in shape and even at that it is not a Standard configuration Quadring,
At some time along the way The wise man at Massey Ferguson decided to use a STANDARD Quadring and I feel that it is not as thick as the original and in SOME cases it gives trouble like you are experiencing.
The transfer tube is assembled Concave seating washer (Steel ) ( with the Concave surface facing up)Quadring ,Teflon backup Washer, Steel Backing concave washer and compression nut, when assembled it is normal to be able to turn the transfer tube to aid in aligning the standpipe with the hole in the lift cover .

Unless you have a specific needfor pressure control I would remove it from the system .
First remove the lift cover,dont forget to take the roller out first .
Next by moving the hydraulic Position control lever to the low pressure area of the control quadrant ,this will minimise the tension on the spring and make it easier to disassemble the unit,remove the small clevis/split pin that retains the pressure control arm to the lift cylinder frame and remove the arm ,and everything in your photograph.
IMPORTANT,because you now have a hydraulic system with no Pressure control protection you must fit a hydraulic pressure releif valve ,The earlier Masseys that were factory fitted with Pressure control also had a Standard 2550 psi relief valve fitted but the later models had a plug installed check, check.

Once done either replace the standpipe or as I do Braze/Weld the hole on the block on the stackpipe.
If you need maximum hydraulic pressure for external use this can still be available by setting the Position control lever within the Constant pumping area of the Quadrant and of course the Draft lever all the way UP.
Happy Days.
Hutch.

 

[klancf51]

When I originally removed the standpipe, it had neither the O-ring nor backup washer installed in the gland of the diverter block where the pressure tube connects to the standpipe. I noticed that the gland in the standpipe diverter block was worn (probably from vibration against the pressure tube). I ordered a new standpipe. The new standpipe came with O-rings and backup washers on the standpipe ends and appeared to have a hydraulic packing in the gland of the diverter block, but did not come with the O-ring (359291X1) installed in the gland. I installed O-ring 359291X1 and tried to install the backup washer (361160X1), but the backup washer simply wouldn't fit inside the gland in diverter block. For this application a backup washer would be desirable to limit O-ring extrusion. But I went with just the O-ring because that is simply all that would fit inside the gland (btw, a second O-ring would not fit either). I carefully installed the standpipe and the lift now operates perfectly and will remain in transport position for hours after the tractor is shutdown. I am working on a new thread to write up the procedure I used to replace this standpipe. When you read it you might recognize some of the tips provided by Shona13 in response to various questions regarding vintage MF hydraulics. I just have to say that the O-ring is truly remarkable and is maybe the best sealing method ever invented. Thanks!