1 k a K m va v v w x FACE PITCH LINE FLANK BACICILASH 005 008 CLEARANCE O yFF THE HEEL OF THE GEAR TOOTH IS THE LARGE END AND THE TOE IS THE SMALL END Fig 51 Gear Tooth Nomenclature 3 While firmly holding the pinion with a rag to form a frijCtion brake turn the ring gear back and forth with a rench fig 50 on the ring gear mounting bolts until a definite contact pattern is formed on the pinion 4 Inspect the contact pattern produced and analyze the results relative to the following data Figure 51 provides gear tooth nomenclature and Figure 52 illustrates the various contact patterns which mav be experienced DRIVE SIDE COAST SIDE HEEL TOE TOE HEEL EXAMPLE A DISIRAQLE PATTERN CORRECT SHIM CORRECT BACKLASH a EXAMPLE B TOE CONTACT INCREASE BACKLASH EXAMPLE C HEEL CONTACT DECREASE BACKLASH EXAMPLE D FACE CONTACT THICKER SHIM REQUIRED EXAMPLE E FLANK CONTACT THINNER SHIM REQUIRED Fig S2 Ring Gear Contact Pattems