Gravely 915146 ZT 34 (SN 035000 +) 915148 ZT 42 (SN 035000 +) 915150 ZT 50 (SN 035000 +) 915168 ZT 34 CARB (SN 035000 +) 915170 ZT 42 CARB (SN 035000 +) 915178 ZT 42 Kohler (SN 035000 +) 915180 ZT 50 Kohler (SN 035000 +) 04758300 4/14 Trimmer User Manual