8Manual No. 016-0171-391 57Replacement PartsInjection Pump Vacuum SwitchTo replace the vacuum switch (P/N 063-0171-035):1. Disable and shutdown any automatic product control features of the Sidekick Pro injection system and turnoff the vehicle when replacing the vacuum switch assembly.2. Disconnect the vacuum switch connector from the motor control cabling. Be careful to keep dust, debris, orliquid chemicals which may seep from the injection pump head from contaminating the cable connections.3. Loosen the vacuum switch while securing the connected fitting to prevent damage to the pump head.4. Apply RectorSeal ® or equivalent thread sealant to the new vacuum switch and thread into the pump head.5. If necessary, slide the protective covering on the vacuum switch back slightly to expose the hex surface fortightening the vacuum switch body.6. Tighten the vacuum switch body two or three quarter turns to secure the vacuum switch.Note: Do not over tighten the pressure transducer. Overtightening the pressure transducer maydamage the pump head.7. Be sure to replace the protective cover over the flow switch before operating the pump.WARNINGAlways use caution when performingmaintenance or servicing an injection pump orsystem which has been previously pressurized.Wear appropriate protective equipment toprevent contact with hazardous chemicals andrinse the chemical system as instructed by thechemical manufacturer prior to performingmaintenance.WARNINGHazardous chemicals may be under pressureeven if the pump has not been in servicerecently. Before replacing any components onthe injection pump, thoroughly rinse theinjection pump with clean water to removeexcess chemical residue.