646 loader valve o-rings
-
- Posts: 48
- Joined: Thu Jul 21, 2022 9:25 am
- Location: USA WA
- Has thanked: 36 times
- Been thanked: 249 times
646 loader valve o-rings
I have looked all over for the correct o-rings for my 646 loader valve, and no one seems to know which ones are correct. My loader valve was leaking, so I bought an o-ring kit, installed the ones that looked right, and now it leaks worse than ever. I am pretty sure the duro rating was too soft, too. Anyone know a part number, or source for the correct size, and duro for the o-rings? The leaks are really driving me crazy. Thanks for any help guys. ------Metalguy
- Harry
- Posts: 1514
- Joined: Sun Mar 07, 2021 8:33 am
- Location: Lockport,NY
- Has thanked: 9403 times
- Been thanked: 6356 times
Re: 646 loader valve o-rings
Metalguy, are you referring to the loader control valve that is located under the dashboard on the right side. I've never had one apart but if you have a hydraulic shop near you, take it to them for the correct seals.
Keep the Peace
Harry
Keep the Peace
Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
- Eugen
- Posts: 5166
- Joined: Wed Mar 03, 2021 2:52 pm
- Location: Port Mcnicoll, Ontario
- Has thanked: 12095 times
- Been thanked: 16346 times
- Contact:
Re: 646 loader valve o-rings
@metalguy the manual shows only one ring on the loader valve
That o-ring is part number 218-5006 which seems to be all over the place, including on @myerslawnandgarden site
https://www.casegardentractorparts.com/ ... remaa.html
Are you maybe talking about different o-rings?
That o-ring is part number 218-5006 which seems to be all over the place, including on @myerslawnandgarden site
https://www.casegardentractorparts.com/ ... remaa.html
Are you maybe talking about different o-rings?
Case 224, 444, 644, 680E
Kubota B26
Kubota B26
- Harry
- Posts: 1514
- Joined: Sun Mar 07, 2021 8:33 am
- Location: Lockport,NY
- Has thanked: 9403 times
- Been thanked: 6356 times
Re: 646 loader valve o-rings
Can you determine where the oil is leaking from? Every connection has an O-ring and even the spools have O-rings.
Keep the Peace
Harry
Keep the Peace
Harry
1973 444, 1974 644, 1976 446, 1977 646, 1986 226
- Spike188
- Posts: 1074
- Joined: Sat Mar 06, 2021 12:58 pm
- Location: Ayr Ontario
- Has thanked: 5829 times
- Been thanked: 4140 times
Re: 646 loader valve o-rings
@metalguy You probably had the correct dimensions on you first o-ring. The problem with kits is that the durometer if the rubber is to soft. Purchasing o-rings from a hydraulic rebuilder will save a lot of headaches and time.
A customer with a 5' X 20 microwave glue curing press kept blowing o-rings on his pilot valves. I took the dimensions of the seats to a rebuilder. He gave me a set that has lasted 4 years now. The kit o-rings were lasting about a week.
A customer with a 5' X 20 microwave glue curing press kept blowing o-rings on his pilot valves. I took the dimensions of the seats to a rebuilder. He gave me a set that has lasted 4 years now. The kit o-rings were lasting about a week.
Spike Colt - 9 & 10, Case - 108, 118, 444, 446, 448, 646, 646bh, Ingersoll 4016, 4118AH
- DavidBarkey
- Posts: 3146
- Joined: Sat Mar 06, 2021 10:35 am
- Location: Waverley On.
- Has thanked: 17290 times
- Been thanked: 10638 times
Re: 646 loader valve o-rings
If it is anything like any of the TCV I have done it will be a metric size . As far as I can figure out the hydraulic components were made be a company with factories in Europe .
Dave
Mad Tractor Builder
Mad Tractor Builder
-
- Posts: 48
- Joined: Thu Jul 21, 2022 9:25 am
- Location: USA WA
- Has thanked: 36 times
- Been thanked: 249 times
Re: 646 loader valve o-rings
I meant the o-rings for the spools in the valve. Sorry if I wasn't very clear. The size I used may well have been the right size, but they lasted all of about an hour before it was leaking. ------Metalguy
-
- Posts: 48
- Joined: Thu Jul 21, 2022 9:25 am
- Location: USA WA
- Has thanked: 36 times
- Been thanked: 249 times
Re: 646 loader valve o-rings
Guys, I found them, and ordered from Messicks. I found the manuals here, and found updated versions of the exact o-rings. Thanks for all who responded, and tried to help me, I appreciate it! ------Metalguy
- Eugen
- Posts: 5166
- Joined: Wed Mar 03, 2021 2:52 pm
- Location: Port Mcnicoll, Ontario
- Has thanked: 12095 times
- Been thanked: 16346 times
- Contact:
Re: 646 loader valve o-rings
Can you please share the manual page or the model numbers? I got a 644 that I'm sure to face the same problem as you.
Case 224, 444, 644, 680E
Kubota B26
Kubota B26
-
- Posts: 48
- Joined: Thu Jul 21, 2022 9:25 am
- Location: USA WA
- Has thanked: 36 times
- Been thanked: 249 times
Re: 646 loader valve o-rings
https://manuals.ccigt.com/More/Model-646-p32a02.pdf Page 25 ------Metalguy