Gran Arm is what I would have called a digger when I was younger, but am informed is a front end loader. It's a four wheeled vehicle with a shovel at the front that raises and lowers. He's the SixBuilder team's equivalent to Constructicon Scrapper except that he's a) red and b) forms the chest, not the leg, of the combined robot.
TF: Fold the shovel as far up & back as it will go. Fold the front of the vehicle down & forward. Stand. Fold the head up.
This is the 22nd Micromaster combiner part I've reviewed and this is the first time there's anything interesting to say about the articulation. Yes it's Micromaster standard: bending, but linked, knees & hip and turning shoulders. But the arms can't raise forward more than 30 degrees because of the vehicle's front wheels hanging off his chest ! Revealed colour here includes the black of the legs - they're black on every version of the toy so I think they're moulded with the vehicle wheels - and the white of the arms & head just like the bodywork of Iron Lift's vehicle mode.
To form SixBuilder's chest take Gran Arm's robot mode, folding his head down and bending his legs forward at the waist. Fold the shovel down onto his back and place him into the cavity on the chest piece with the shovel pointing up
Adequate vehicle mode but the robot mode is hampered by the wheels hanging off the chest.
Gran Arm was sold in Japan in 1992 in the Operation Combination TF-01 SixBuilder set.
Gram Arm is packed with the blue chest of the combined robot and it's head which is painted black & silver over yellow plastic indicating that it, like SixBuilder's hands, are moulded on the same sprue as Treader.
Destron Gran Arm comes with the chase version of the combined robot's chest & head that his Cybertron counterpart has.
Buckethead is packed with just the chest of the combined robot.