I recently took delivery on a new-old-stock 60"
Bush Hog Rollover Box Blade // RO-600. Somewhat to my surprise it has this sticker: Made In India.
However, this does not infer that this is less than a dirt-working beast at 630 pounds. Mine arrived without a manual. A rollover box blade is pretty simple to operate:
Raise the implement with your tractor's lift arms, pull on the latch handle from the tractor seat to unlatch, then gravity swings it to vertical, next you either pull forward or back slightly to latch the handle on to the ripper latch-block, then rip. To bulldoze, lift ROBB; and unlatch, back up slightly and handle usually will drop into second latched position; you are ready to bulldoze. To forward scrape, unlatch, pull tractor forward and ROBB will drop into forward use position, handle will latch on the same latch-block as for bulldozing but implement is now oriented in opposite direction. You are ready to scrape and pull dirt.
(One latch-block is use for ripping with ROBB oriented
vertically. Second latch-block is used in both bulldozing and scraping positions with the ROBB oriented
horizontally for bulldozing and scraping.
Only push LOOSE dirt when bulldozing in reverse. Potential is there to bend lift arms which are NOT engineered primarily for PUSHING.
Operationally a ROBB differs from a "regular" box blade in that you must rip then scrape/pull in discrete operations.
You cannot use the rippers and scrape at the same time. This is not important to me because just a pull on the latch handle takes you from rip to scrape. Operator does not have to adjust 5 (6?-7?-8?) ripper shanks individually. ( The unlatching handle is engineered for a right-handed operator, I am a lefty. )
For smooth shifts between the three functions lubricate all the "rollover" parts and the four latch blocks, two on each side; I use spray lithium grease.
There is an instructive video on YouTube featuring a vintage Gannon Rollover Box Blade, which gave me the basic operating confidence I needed:
Free Gannon Earthcavator - YouTube
Watch your body parts under this heavy implement. When off your tractor have the implement DOWN on the ground before fooling with it. Heavy, HEAVY,
HEAVY!!!!
I use two concrete blocks with a 4" X 4" X 6' post across the two blocks to support the front of the frame when I "park" the ROBB between uses. It can be difficult to get the draw pins in and out. The "secret" is to adjust the top link until you find a slack position for the draw links, a separate top link adjustment for left and right draw pins.....plus plenty of spray lithium grease on the draw pins. You will bless me for sharing this "secret".
I pull my ROBB behind a Kubota B3300SU tractor/loader package: 33-hp / 1,800 pounds; a good match of tractor and ROBB.
(( Thank you MtnViewRanch for answering
my questions when my ROBB just arrived. ))