FORM NO. 56043123 - SR 1900 - 7SECTION 3 — MAINTENANCEWARNING!Turn the key switch off and remove the key from the ignition switch before performing any machine maintenance.MAINTENANCE SCHEDULEMaintenance intervals given are for average operating conditions. Machines used in severe operational environments may require service more often.Maintenance Item Daily Weekly Monthly HoursCheck for any coolant, hydraulic or refrigerant leaks.Note: Refrigerant leaks can appear as dirty, oily areas around A/Ccomponents and fittings.X 8-12Check the cab filter and clean or replace as necessary.Note: The cab filter may need to be cleaned or replaced more often if themachine is operated in dusty environments.X 40Clean the heater core fins and air box (heater only). X 160Clean the evaporator and heater core fins inside the evaporator-heater unit(A/C only). X 160Clean the condenser fins (A/C only). X 40TO CLEAN AND REPLACE THE CAB FILTERRefer to Figure 3-1.Remove the four screws holding the1. Cab Filter Cover, then remove the Cab Filter Cover and Filter from the machine.Clean the2. Filter using any of the following methods:Tap the Filter gently on a flat surface (dirty side down).Clean the Filter with compressed air (100 psi max.) blown from the inside (cab side) of the Filter.Soak the Filter in warm water for 15 minutes, rinse with clean water (40 psi max. water pressure), then air-dry (don’t use compressed air). Make sure theFilter is completely dry before reinstalling.Reinstall the3. Filter and Cab Filter Cover, then reinstall and tighten the four screws.FIGURE 3-1 – Cab Filter