1640 Loader Control Valve

Edkut

New member

Equipment
Kubota B7200HST-D
Jan 25, 2025
5
1
3
Hampton NH
I am trying to find a replacement valve or repair parts for a 1640 loader. OE valve # 70050-01597. It has In, Out, and PB connections as well as the loader up & down and curl connections. The OE valve and parts are discontinued. I am having trouble with the bucket curl function. The valve will not spring load into neutral position. I have replaced the spring and the brass cup with another one that looked compatible does not seem to center itself correctly. Also will bleed down. Not sure if valve is rebuild able or If I could find a suitable aftermarket replacement. Any advice would be appreciated.
Thank You,
Ed
 

TheOldHokie

Well-known member
Lifetime Member

Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
Apr 6, 2021
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4,745
113
Myersville, MD
windyridgefarm.us
I am trying to find a replacement valve or repair parts for a 1640 loader. OE valve # 70050-01597. It has In, Out, and PB connections as well as the loader up & down and curl connections. The OE valve and parts are discontinued. I am having trouble with the bucket curl function. The valve will not spring load into neutral position. I have replaced the spring and the brass cup with another one that looked compatible does not seem to center itself correctly. Also will bleed down. Not sure if valve is rebuild able or If I could find a suitable aftermarket replacement. Any advice would be appreciated.
Thank You,
Ed
Replace with aftermarket - $250.

What functiin is bleedibg down?

Dan
 

Edkut

New member

Equipment
Kubota B7200HST-D
Jan 25, 2025
5
1
3
Hampton NH
Replace with aftermarket - $250.

What functiin is bleedibg down?

Dan
The curl/dump function leaks down. Also the valve will not center it self. I had replaced the spring and brass cup on the end of the valve sleeve and it was not exactly the correct part. The old part had rotted and the correct part is no longer available. I may be able to modify it to center correctly. I'm thinking a new aftermarket valve would be the easiest as the linkage is worn and will need to be re bushed/repaired as well. Not sure how to find the correct valve with the in, out, and pb connections? If you have any suggestions it would be much appreciated. Thanks !
 

TheOldHokie

Well-known member
Lifetime Member

Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
Apr 6, 2021
9,084
4,745
113
Myersville, MD
windyridgefarm.us
The curl/dump function leaks down. Also the valve will not center it self. I had replaced the spring and brass cup on the end of the valve sleeve and it was not exactly the correct part. The old part had rotted and the correct part is no longer available. I may be able to modify it to center correctly. I'm thinking a new aftermarket valve would be the easiest as the linkage is worn and will need to be re bushed/repaired as well. Not sure how to find the correct valve with the in, out, and pb connections? If you have any suggestions it would be much appreciated. Thanks !
The leakdown is probably caused by bad seals in the cylinders.

This Summit valve will drop right in. Make sure you get the power beyond sleeve in addition to the valve itself.

 
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Edkut

New member

Equipment
Kubota B7200HST-D
Jan 25, 2025
5
1
3
Hampton NH
The leakdown is probably caused by bad seals in the cylinders.

This Summit valve will drop right in. Make sure you get the power beyond sleeve in addition to the valve itself.

Thanks for the info. I contacted Summit and they gave me the same info. As to the cylinder sleeves I will address that if the valve does not totally fix the problem. Unfortunately those seal kits are also discontinued from Kubota. Have you had any experience with rebuilding those cylinders ? Are there aftermarket seal kits available ? Thanks again for your response !
 

TheOldHokie

Well-known member
Lifetime Member

Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
Apr 6, 2021
9,084
4,745
113
Myersville, MD
windyridgefarm.us
Thanks for the info. I contacted Summit and they gave me the same info. As to the cylinder sleeves I will address that if the valve does not totally fix the problem. Unfortunately those seal kits are also discontinued from Kubota. Have you had any experience with rebuilding those cylinders ? Are there aftermarket seal kits available ? Thanks again for your response !
I replaced my cylinders with new aftermarket.

Dan