Ark Loader Spool Valve

[BuffaloD200 53]

Finally getting around to working on my ark loader.  The previous owner said he thinks the problem is with the spool valve.  

As I've learned a bit more about hydraulics now, I'd like to get this all sorted out.  

I noticed the power beyond port is connected to the reservoir return.  Is that right?  

Anyone see anything blatantly incorrect?

[BuffaloD200 53]

Some extra photos.

 

Also, 1980 WH D-200 with 550? Loader

[wallfish 20,433]

28 minutes ago, BuffaloD200 said:

Finally getting around to working on my ark loader.  The previous owner said he thinks the problem is with the spool valve.  

As I've learned a bit more about hydraulics now, I'd like to get this all sorted out.  

I noticed the power beyond port is connected to the reservoir return.  Is that right?  

Anyone see anything blatantly incorrect?

Looks correct to me. The Power beyond port is an out port. 

What kind of trouble are you having that needs to get sorted out?

[Handy Don 17,224]

I don’t know that control valve specifically, but with Power Beyond (typically labelled “N”) connected to the reservoir is there a separate Tank (“T”) port on the valve and, if yes, where is it connected?

T and N are both “out” ports, but they have different purposes.

T always gets plumbed directly to the reservoir (i.e. the Tank), can often use lower-pressure hoses, and should never see much pressure. It’s job is to route fluid from the non-pressure side of a cylinder into the reservoir while the pressure side of the cylinder is being filled 

N typically get plumbed to the P port on an additional control valve (which must have its T plumbed to the reservoir) via hose that can support FULL PRESSURE. N's job is to allow working pressure fluid to reach “beyond” the current valve while still supporting full pressure/flow to cylinders attached to the current valve.