Screw, rocker arm adjusting. Tractors: 2000, 3000, 4000, 5000, 2600, 3600, 3900, 4100, 4600, 5600, 5700, 6600, 6700, 2310, 2610, 2810, 2910, 3610, 3910, 4110, 4610, 5110, 5610, 5910, 6610, 6710, 3230, 3430, 3930, 4130, 4630 (to 5-1994), 4830, 5030, 5640, 6640, 7740, 5610S, 6610S, 7010S, 7610S, 7810S, 7840, 8240, 8340, 8260, 8360, 8560; Hiway Tractors: 233, 333, 334, 335; LCG Tractors: 231, 530A; Loader Tractor: 535; Tractor Loader Backhoe: 420; Utility Tractors: 515, 532.