1640 Loader Control Valve

[Edkut]

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

 

[North Idaho Wolfman]

Talk to @Summit Hydraulics they should be able to help you out.

 

[TheOldHokie]

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]

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 !

 

[Edkut]

Talk to @Summit Hydraulics they should be able to help you out.

I will contact Summit. Thanks !

 

[TheOldHokie]

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.

Hydraulic Directional Control Valve for Tractor Loader w/ Joystick, 2 Spool (Single Float Spool Optional), 11 GPM

This Monoblock Hydraulic Directional Control Valve uses a Joystick, 2 Spools and has a capacity of 11 GPM. These valves are used to start and stop fluid flow into hydraulic cylinders or hydraulic motors.

summit-hydraulics.com

 

[Edkut]

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.

Hydraulic Directional Control Valve for Tractor Loader w/ Joystick, 2 Spool (Single Float Spool Optional), 11 GPM

This Monoblock Hydraulic Directional Control Valve uses a Joystick, 2 Spools and has a capacity of 11 GPM. These valves are used to start and stop fluid flow into hydraulic cylinders or hydraulic motors.

summit-hydraulics.com

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]

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

 

[Edkut]

I replaced my cylinders with new aftermarket.

Dan

Thanks Dan !

 

[Edkut]

Do you know if the factory quick disconnect couplers are 3/8 npt ? I was going to order the valve discussed in the above thread and would like to replace these couplers as well. Or if possible replace the o-rings inside the original couplers ?

 

[TheOldHokie]

Do you know if the factory quick disconnect couplers are 3/8 npt ? I was going to order the valve discussed in the above thread and would like to replace these couplers as well. Or if possible replace the o-rings inside the original couplers ?

My B1630 does not have couplers but lookimg at the B1640 parts book it appears two are 3/8 NPT and the tank return is 1/4. Should be easy to verify. You are in conyrol of the replumbing and can make it anything you want.

Dan

 

[Edkut]

My B1630 does not have couplers but lookimg at the B1640 parts book it appears two are 3/8 NPT and the tank return is 1/4. Should be easy to verify. You are in conyrol of the replumbing and can make it anything you want.

Dan

Thanks Dan,
I figured I would verify them but was just looking for any knowledge you may have !