G643(E) Service Manual Chapter 2. Recommended Maintenance 30 CHCK POINT INTERVAL HOURS Daily Every 250 Hours or 1 month Every 500 Hours or 3 month Every 1000 Hours or 6 month Every 1500 Hours or 9 month Every 2500 Hours or 15 month Every 3000 Hours or 18 month Pressure Regulator/Converter Test regulator pressures. X Inspect pressure regulator vapor hose for deposit build-up. Clean or replace as necessary. X Inspect regulator assembly for fuel/coolant leaks X Fuel Trim Valve(G420FE only) Inspect valve housing for wear, cracks or deterioration. X Ensure valve seals in the closed position when the engine is off.
X Replace FTV When indicated by MIL Carburetor(Mixer) Check air filter indicator X Check for air leaks in the filter system. X Inspect air/fuel valve mixer assembly for Cracks, loose hoses, and fittings. Repair or Replace as necessary. x Check for vacuum leaks in the intake system including manifold adapter and mixer to throttle adapter x Repair or replace throttle assembly When indicated by MIL Inspect air filter. X Replace air filler element X Check TMAP sensor for tightness and leaks. X Exhaust & Emission Inspect engine for exhaust leaks X Replace PCV valve and breather element. X Replace HEGO sensors When indicated by MIL