[oldmanfarmer]

I am having a problem find the proper torque for the (4)cap screws #48 in diagram attached and the castellated nut #23 in diagram attached for the valve spool bolt #35 in diagram attached.

The Spec sheet attached is not clear.

 

[Hacke]

If nothing else is stated, assume standard torques.

Go to:
https://partstore.agriculture.newho...EN&currency=#epc::mr64887ar259191bi3279546-19
and
https://partstore.agriculture.newho...EN&currency=#epc::mr64887ar259191bi1655867-42

The cap screws' thread is 3/8"-24 and the spool bolt thread is 1/4"-28.

Check the heads for grade markings.
Search Internet for "bolt grade markings" and you get, for instance:
https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx

Search Internet for "sae bolt tightening torque" and you get, for instance:
www.americanboltcorp.com/tech/techtorque.pdf

So, if they are both grade 5, the torque for the cap screws is 25/35 lb*ft, and for the spool bolt it is 7.2/10 lb*ft.

 

[oldmanfarmer]

This is

If nothing else is stated, assume standard torques.

Go to:
https://partstore.agriculture.newho...EN&currency=#epc::mr64887ar259191bi3279546-19
and
https://partstore.agriculture.newho...EN&currency=#epc::mr64887ar259191bi1655867-42

The cap screws' thread is 3/8"-24 and the spool bolt thread is 1/4"-28.

Check the heads for grade markings.
Search Internet for "bolt grade markings" and you get, for instance:
https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx

Search Internet for "sae bolt tightening torque" and you get, for instance:
www.americanboltcorp.com/tech/techtorque.pdf

So, if they are both grade 5, the torque for the cap screws is 25/35 lb*ft, and for the spool bolt it is 7.2/10 lb*ft.

Great information for what ever the job is.

Thank you.
OMF

 

[Hacke]

If you have a bolt and nut arrangement, you usually need a torque that is required to produce the friction forces that holds pieces together. In the case with this spool bolt you compress a spring to achieve a preload, a tension that holds the valve spool in normal position. It is not a friction force holding the spring compressed, it is the form of the bolted joint after compression that holds it compressed.

Usually there is a stop for the nut on these arrangements, a shoulder on the bolt for instance. I believe it is the collar #34 in the Shop Manual's diagram that sets the distance in this case. You turn the nut until it "bottoms" against the stop (spring compression is completed) and, if needed, back it off to find a hole for the cotter pin. There is no need to bother about torque specs in this case.

 

[oldmanfarmer]

If you have a bolt and nut arrangement, you usually need a torque that is required to produce the friction forces that holds pieces together. In the case with this spool bolt you compress a spring to achieve a preload, a tension that holds the valve spool in normal position. It is not a friction force holding the spring compressed, it is the form of the bolted joint after compression that holds it compressed.

Usually there is a stop for the nut on these arrangements, a shoulder on the bolt for instance. I believe it is the collar #34 in the Shop Manual's diagram that sets the distance in this case. You turn the nut until it "bottoms" against the stop (spring compression is completed) and, if needed, back it off to find a hole for the cotter pin. There is no need to bother about torque specs in this case.

thanks