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Ok to repace the input seal you need to follow the enclosed instructions, In most ases its best to remove the unit.

1. Thoroughly clean input shaft valve housing, yoke locknut, plug and pinion bearing plug.
2. Install steering gear in suitable holding fixture. NOTE : Do not remove external pressure lines unless they are leaking or damaged. If lines are removed, new Teflon(R ) seals must be installed.
3. 1. Using locknut wrench tool No. T78P-3504-H, or equivalent, loosen yoke plug locknut, then yoke plug.
   2. Remove pinion bearing plug.
   3. Install pinion shaft torque adapter tool No. T74P-3504-R, or equivalent, on input shaft and remove pinion bearing locknut while holding input shaft. NOTE : Do not allow rack to reach full travel when loosening or tightening locknut.
   4. Using suitable tool, pry input shaft dust seal from housing, being careful not to damage valve housing surfaces.
   5. Remove snap ring, located beneath dust seal, from housing.
   6. Install puller tool No. T78P-3504-B, or equivalent, on input shaft and tighten nut on tool to remove input shaft and valve assembly, together with input shaft seal and bearing, from housing.
   7. To remove lower pinion shaft seal, insert seal remover tool No. T78P-3504-E2, or equivalent, and spacer collar tool No. T86P-3504-J, or equivalent, until it bottoms, then hold large nut and tighten small nut on tool until expander fully tightens.
   8. Install slide hammer tool No. T50T-100-A, or equivalent, in rear of seal remover tool No. T78P-3504-EZ, or equivalent, then pull lower pinion shaft seal from housing.
   9. Inspect pinion bearing, removing only if replacement is necessary.
   10. Remove O-ring seals only if replacement is necessary.
4.