Auxiliary Hydraulics Modification for 422/425

BobRip · Jun 30, 2006

I felt that the "Maybe a Step \'Backwards\', But Handy?" thread had too many post and that the change would get lost, so I decided to post the change here. I will try to do a parts description. I just went into Napa and Cavalier tractor to get the parts. I took the hydraulic quick connect with me. You should do this to if you have doubts. It is NPT (National Pipe Thread) 1/4 inch as are all of the threads. I have ordered a valve from Surpluscenter.com. Be sure all parts are rated at lest 2500 PSI, you proably need steel parts.

Valve from Surplus center - part number 9-5540-4 1/4" CARBON STEEL BALL V001 359858 -
NAPA may have the rest of the parts, but I got some at Cavalier tractor.

Qty 2 - TEE connector with two swivel females and one male end. 1/4 inch NPT thread. The male is in the center. You may want to use TEEs with three swivel females and get two extra hex nipples.

Qty 2 - 90 elbow - One end swivel female and one male

QTY 2 or 4 (if you have an all female TEE) 1/4 inch NPT hex nipples - Male on both ends.

I put Teflon tape on all the threads, leaving the first thread without the tape to keep Teflon out of the hydraulic fluid. I don't believe it is needed on the one going into the T female end because the seal is the end of the nipple.

To pull the hose that are in the tubes going back to the drivers area, unscrew the square headed bolt on the top of the tube, pull out the quick connect and lock a vice grip on hose fitting. I struggled with a 9/16 inch wrench before figuring this out. You may have to cut the tie wrap at the other end of the metal tube.

Disclaimer - Plumbing is not my trade, I just go in and tell the "expert" at the parts store what I need to do. Good luck and let us know of any changes. I would take the pictures with you to NAPA.

Here is a link surplus center parts surplus center

Good luck,
Edit: I am uploading smaller files for the dial up guys. They are the same as the other pictures.
Bob Rip

BobRip · Jul 1, 2006

I used the 422 with this modification for about 45 minutes with the minihoe and the same with the 4 in 1 bucket on Friday. No issues and changing attachments was a breeze.

Has anyone else made this modification yet?
Bob Rip

marrt · Jul 2, 2006

I plan on making it. As soon as I get time to also change the couplers to the "flat face" type.

bbabineau · Jul 2, 2006

marrt said:
I plan on making it. As soon as I get time to also change the couplers to the "flat face" type.

Help - what is a flat face coupler??

marrt · Jul 3, 2006

They look like the attached picture. There's a few advantages to them:

- you can connect them with one hand
- you can connect and disconnect them while they are under "moderate" pressure (helpful when your attachment heats up in the sun)
- they don't leak oil each time you disconnect them (something else I like)
- they are less susceptible to dirt contamination (not really an issue if you use caps on PT couplers)

However, they are more expensive.

BobRip · Jul 3, 2006

marrt said:
They look like the attached picture. There's a few advantages to them:

- you can connect them with one hand
- you can connect and disconnect them while they are under "moderate" pressure (helpful when your attachment heats up in the sun)
- they don't leak oil each time you disconnect them (something else I like)
- they are less susceptible to dirt contamination (not really an issue if you use caps on PT couplers)

However, they are more expensive.

Looks interesting. How expensive are they?

Just to play the bad guy, let me list some disadvantages.
You would have to change all of the attachments couplings.
It would be more difficult to share attachments with somebody (although sometimes this would be an advantage).
It would be expensive.

The advantages are impressive thought.

Bob Rip

marrt · Jul 4, 2006

They are very expensive for the larger ones. McMaster has the prices starting on page 259. My PTO has a slight positive pressure when the engine is running. So I have to turn the tractor off to connect or disconnect an attachment. Also, I have problems with the Sun heating up the cylinders on my 4 in 1 bucket. So, my main motivation is the “connect under pressure” option. HOWEVER, not all the flat face couplers have this option. In fact, I don’t think any of the couplers on McMaster have this feature. It’s hard to know because they don’t list the manufacturer and exact model number. Snap-tite, Faster and Eaton make flat face couplers that can be connected under pressure. Snap-tite seems to have the best solution at the moment (CP74 series). However, I can’t find anywhere online to order them.

bbabineau · Jul 4, 2006

marrt said:
They look like the attached picture. There's a few advantages to them:

- you can connect them with one hand
- you can connect and disconnect them while they are under "moderate" pressure (helpful when your attachment heats up in the sun)
- they don't leak oil each time you disconnect them (something else I like)
- they are less susceptible to dirt contamination (not really an issue if you use caps on PT couplers)

However, they are more expensive.

These look great and if they would allow me to change from my minihoe to 4in1 without waiting an hour for the connectors to cool so they can be attached it would be an interesting change. Question - do you need to change both the male and female connector? If so then I guess all connectors would need to be changed.

Thanks for the information

Bob

BobRip · Jul 4, 2006

bbabineau said:
These look great and if they would allow me to change from my minihoe to 4in1 without waiting an hour for the connectors to cool so they can be attached it would be an interesting change. Question - do you need to change both the male and female connector? If so then I guess all connectors would need to be changed.

Thanks for the information

Bob

Bob, I sometimes keep a bottle of water handy. I poor some of it on the fittings to clean off the dirt and cool the fittings down, so they are easier to handle. This is particularly helpful with the mower fittings. I have not had much problem with the 1/4 inch fittings. The flat face fittings are probably better, but cost a little more.

Bob Rip

J_J · Jul 4, 2006

marrt said:
They are very expensive for the larger ones. McMaster has the prices starting on page 259. My PTO has a slight positive pressure when the engine is running. So I have to turn the tractor off to connect or disconnect an attachment. Also, I have problems with the Sun heating up the cylinders on my 4 in 1 bucket. So, my main motivation is the “connect under pressure” option. HOWEVER, not all the flat face couplers have this option. In fact, I don’t think any of the couplers on McMaster have this feature. It’s hard to know because they don’t list the manufacturer and exact model number. Snap-tite, Faster and Eaton make flat face couplers that can be connected under pressure. Snap-tite seems to have the best solution at the moment (CP74 series). However, I can’t find anywhere online to order them.

Try this place.

https://www.flowline.net/default.as...9&tree=152319*SNAP-TITE+QUICK+DISCONNECTS*0@@