And is fit for John Deere 5103, 5203, 5303, 5403, 5045, 5055, 5065, 5075 tractors. Tractor: Fit for John Deere 5103, 5203, 5303, 5403, 5045, 5055, 5065, 5075 Tractors. Critical Timing Function: Specifically designed to rotate the engine flywheel and lock the crankshaft at Top Dead Center (TDC), allowing for accurate high-pressure fuel pump timing checks.