Do you know if there is a filter for the slew gearbox on this 080-3 Kabuta?

I can only find the following 3 hydraulic filters on this machine 2 are in the hydraulic tank as below And the 3rd is inline the hydraulic system as below Attachments: https://lsengineers.zendesk.com/attachments/token/5rhmt32yUF2XSzabNYgXQw9wZ/?name=image002.png https://lsengineers.zendesk.com/attachments/token/m91ZNpUQYhnFI10fzS7Mg2XzL/?name=image001.png