Input Force assume 500N (Adult weight 60kg)

Input Torque:

Handwheel r=850mm

T = F * r
  = 500N * 0.85m
  = 425Nm

Output Force:

Rack Spur r=24mm

F = T / r
  = 425Nm / 0.024m
  = 17708N 
   (~ 1800kg)

Output Pressure (Cylinder r=12.5mm)

P = F / A
  = 17708 / 0.00049m2
  = 36138775 N/m2 (Pa)
  = 36.1MPa
   (~ 5000psi)