Having a problem with the etched backlash in ring gear. Axle is a zf mt l3085 dk. Backlash is etched in ring gear problem is I dont understand it. Reads ? o86 but who knows. . .086mm seems tight
8 and 6 are clear enough. Is the first "digit" a German 1, and the second either a sloppy 0 or a symbol that means "between" so between 1 and .86 mm? but 1 mm seems high. Doesn't seem like a German would etch such a sloppy 0.
Or do you read it 980v
Talked to a zf tech the number is 1086 and is the backlash number yet being an old unit he wasn't sure what it ment and said to go with 8 to 10 thousandths. I still wonder what 1086 could be in metric. The upside down v is a one in German and it's why there is a line through a 7.
Does the pinion have the same number? They usually do to show they are a matched set. On a ZF, the numbers that matter are usually stamped in the end of the pinion and on the housing for pinion depth and those numbers generally appear something like this: 88,0 on the pinion and 119,80 on the axle housing. Once the pinion depth is checked then backlash is a function of just moving the ring gear and that spec is in a manual, not stamped on the ring gear. Most axles would be around .007" - .015" I would imagine. Then tooth pattern also needs to be checked with Prussian Blue.
Case manual and zf manual send you to etching in ring gear for backlash. I set it at 9thousandths and checked pattern. No number on pinion