4620 steering valve leak

[Ireland.29]

4620 sprung a hyd oil leak when I started it today, I may have
had the engine revs too high when backing off the manual de
stroke screw on pump!?

It's leaking near the hand throttle between the steering wheel
& the valve itself .. Any ideas? It's a reman valve sourced in
USA about three years ago & this is first trouble

 

[Ireland.29]

hoping Tim S or TX Jim might have an idea on this? It could be an O-ring or worse, cracked housing... didnt even look under dash cowl yet but removed steering wheel and hand throttle assembly and oil pouring out the top with the engine running? If I need to ship the valve to you Tim then I'm willing to do that.

 

[Tx Jim]

I think screwing out destroking screw at higher rpm's didn't cause leak. My guess is the upper seal failed and valve needs a seal kit.

 

[Ireland.29]

do you know which seal it might be? only approx 700 Hrs on re-man unit & was not expecting a leak

 

[D-]

What you did had nothing to do with steering leak.
Upper seal beneath steering wheel has nothing to do
with leak. Oring and backup for piston shaft is your
leak. You will need complete seal kit installed.

 

[Ireland.29]

Would it be possible to replace this seal without a test bench
?

 

[Tx Jim]

Yes seals can be replaced without a test bench as many have been resealed without one. Only problem is correct operation & no leaks won't be established until after reinstalling valve on to tractor unlike on a test bench such as Tim s has.

 

[Tx Jim]

O-ring & backup washer(parts key 18 & 19) is where the problem is. Adjusting valves requires a special plate & a dial indicator. I'm not sure if one can reseal without disturbing valve settings.

 

[Tx Jim]

I forgot you asked about the seal kit. AR39585 Piston Kit - PISTON KIT, STEERING PISTON CYLINDE ADD 130.03 USD

 

[Ireland.29]

thanks Jim, I had a look while ago (valve is still on tractor) and removed steering sheel & found parts key no.9 is pinched.. is it wishful thinking to just try replacing
this and see if it stops the leak?

 

[Tx Jim]

(quoted from post at 09:22:08 01/17/16) found parts key no.9 is pinched.. is it wishful thinking to just try replacing this and see if it stops the leak?

It will surprise me if replacing seal(parts key 9) corrects leak.

 

[tim s]

It's most likely that O-ring #19 is worn and allowing oil to go up the shaft and over powering seal #9

 

[David G]

I would ship the whole thing to Tim S, it will come back fixed and calibrated.

 

[Ireland.29]

you are spot on Tim & thanks to the other posters too. I had a valve seal kit here and replaced the seals (parts key no.9 X 2) at the top of the shaft and it has stopped the oil but I didn't let the engine run for long as I could see the seals were starting to come under pressure & would blow eventually.

Tim - do you have an email address I could contact you on?

 

[tim s]

[email protected]

 

[Ireland.29]

just wanted to update you guys, think I am sorted, this is due to the help you provided and especially Tim S who was never too busy to take calls or respond to emails and man does he know his stuff with these steering valves! reckon 18/19 in Jims diagram is what caused the problem originally, but I still had a slight leak after replacing those.. the fix to that is below (copy of email to Tim)

I spent time this morning on the top part seals and I held the shaft up as high as it would go while fitting the seals and then put the snap ring on and it all seemed secure.. last time I did it, the shaft was a couple of inches down and it moved up when the tractor started and may have upset the seals? anyways - it ran for 20 minutes without any leaks.. not sure if I am out of the woods yet but hopefully!