Meyers HJ100S Pressure Switch Adjustment: Factory Set, Replace If Faulty

Adjusting Cut-In/Cut-Out on Meyers Pump Pressure Switch

Meyers HJ100S pump with pressure switch, gauge, tank. Two adjustment screws: "raise cut-on/cut-off" and "cut-off only." Cut-off screw backed out, inactive. Pump cycles 10 sec on to 45 PSI, off at 24 PSI.

Switch Specs: 30/50 PSI Factory

This switch is preset to cut in at 30 PSI, cut out at 50 PSI. Your 24/45 cycle is off-spec.

If Adjustment Screw Does Nothing → Replace Switch

Contact John Deere dealer (Meyers distributor) or local pump supplier. Switch is likely worn.

Don't force adjustments—replace the $20 part.