Timberjack 480C question

We recently bought an older Timberjack 480C. The grapple rotate motor was missing, but we have been able to track one of them down. ( Thanks Woodland Equipment and RLM) I am unable to find if there is supposed to be a crossover relief valve on this style of grapple. I've seen this type of grapple on other Timberjacks, but most don't have this barrel style of grapple attachment.
The Timberjacks with the Esco grapples show a crossover relief valve just before the rotate motor. We've...

Timberjack 480C question

Timberjack 480C question