Air Shift PTO

We have two trucks that have wet kits on them. One we installed ourselves, and the other had the kit on since it was new. The one that we installed requires air to engage it, and the other requires air to disengage. They both work fine, but on these cold mornings the one that requires the air to be built up in order to disengage puts a load on the engine immediately until the air pressure builds up.
I really don't like putting any load on a cold engine, so I just hold the clutch in until the air builds up.
Was this done so that one would be warming up the hydraulic oil with the engine?

 

I believe the one that we put on is a Chelsea. I'll have to look at the other. It is on the 2000 KW that I bought this year, and has had a Reliance transfer dump bed on it since it was new. Reliance may have been the original installer.

 

I should be able to just change out the air shift portion I suppose. It would be bad to have a leak in the line while going down the road, and have the PTO try to engage.

 

I'm not sure. I'll have to investigate a bit.

 

I'm trying to wrap my mind around this and how the air solenoid operates, because it functions perfectly as is, and the switch in the cab is plumbed accordingly. I guess the air switch itself must have a spring inside which would normally disengage the PTO gear box, and if the mounting is such that it can be mounted the opposite direction and still engage the PTO correctly then perhaps it is possible. It has to be more than just having the air line plumbed correctly (I think).
Thanks for the help!