Yanmar YM155d Service Manual page 106

(2)
When using new bevel gars,
i) Insert shims [two sizes available: 0.004, 0.012 in (0.1, 0.3 mm)j between
the bevel gear 14 and bill bearing 6305 so that the backlash [Item' 12)of the
bevel gear 14 and king pin bevel gear 28/14 /18/18] is 0.004-0.012 in
(0.1-0.3 mm).
ii) Insert shims [two sizes mailable: 0.004, 0.012 in (0.1, 0.3 mm)] between
the bevel gear 20 1271 and ball bearing 6306 /6305] so that the backlash
(Item 13) of the kingpin bevel gear 28/14 /18/18] and bevelgem 20 /27]
is 0.004-0.012 in (0.1-0.3 mm).
CAUTION:
I ) Figures or the end of gear indicate the number of teeth
2) Figures in [
] indicate those before Serial No. 51 000.