Question about hyrdaulics

[rasorbackq]

Here is the saw

Reservoir Was told by the guy I bought is from it has Automatic Transmission Fluid .

 

[rasorbackq]

Just a bunch of pics of the saw parts

The level mounted on an angle with the rubber boot all cut up is the travel portion of the saw.
Pump is powered right from the pulley .
Can you tell if its a open center system by the pics. If so how long would the engine have to run to get the fluid warm?

 

[wdchyd]

Open center fixed displacement with vickers vane pump and danfoss hyd motors

15 or 20 mins with a warm-up blowing over a relief valve

A sight guage w/temp will help determine when it's warm.... 5 Inch Hydraulic Reservoir Sight Gauge with Thermometer