Open the right side cover.
Evacuate the A/C System. (See Reclamation And Charging With Recovery / Charging Unit on Page 70-40-3.)
Remove the right upperstructure cover. (See Removal And Installation on Page 40-80-1.)
Locate the pressure switch (Item 1) [Figure 70-70-4].
Disconnect the wire harness (Item 2) [Figure 70-70-4] from the pressure switch wire harness.
Remove the pressure switch from the excavator.