IntroductionProduct IdentificationSafetyOperatingReplacement PartsService IntervalsService LubricationService Engine - Models GX325 and GX335Service Engine - Model GX345Engine Warranty Maintenance Statement Changing Engine Oil and Filter Servicing Air Cleaner Elements Service TransmissionService SteeringService MowerService ElectricalService MiscellaneousTroubleshootingStorageAssemblySpecificationsWarrantyJohn Deere Quality StatementService Record
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Service Engine - Model GX345Engine Warranty Maintenance StatementMaintenance, repair, or replacement of the emission control devices and systems on this engine, which are being done at the customers expense, may be performed by any non-road engine repair establishment or individual. Warranty repairs must be performed by an authorized John Deere dealer. Avoid FumesEngine OilUse oil viscosity based on the expected air temperature range during the period between oil changes. The following John Deere oils are preferred:Other oils may be used if above John Deere oils are not available, provided they meet the following specification:· API Service Classification SG or higher Checking Engine Oil LevelNOTE: Check oil twice a day if you run engine over 4 hours in a day. Make sure engine is cold when checking engine oil level. 1. Park machine safely. (See Parking Safely in the SAFETY section.) 3. Clean area around dipstick to prevent debris from falling into crankcase. 4. Remove dipstick (A). Wipe with clean cloth. 5. Install dipstick into tube, but do not tighten it. Let dipstick threads rest on top of tube. 7. Check oil level on dipstick. Oil must be between ADD and FULL marks (B). 8. If oil level is low, add oil to bring oil level no higher than FULL mark on dipstick. 9. Install and tighten dipstick. Lower hood. Changing Engine Oil and Filter2. Park machine safely. (See Parking Safely in the SAFETY section.) 4. Put drain pan under drain valve. If available, install drain hose. 5. Open drain valve (A) and drain oil into drain pan. Allow oil to drain completely. 7. Wipe dirt from around oil filter (C). 8. Place a drain pan or funnel under filter tray. 9. Remove old filter and wipe off filter tray. 10. Put a light coat of fresh, clean oil on the filter gasket. 11. Install replacement oil filter by turning oil filter to the right (clockwise) until the rubber gasket contacts filter base. Tighten filter an additional one-half turn. · With oil filter change: 1.9 L (2.0 qt) · Without oil filter change: 1.7 L (1.8 qt) 14. Install and tighten dipstick. 15. Start and run engine at idle to check for leaks. Stop engine. Fix any leaks before operating. 16. Check oil level, add oil if necessary. Cleaning Air Intake Screen
1. Park machine safely. (See Parking Safely in the SAFETY section.) 3. Clean engine screen (A) and external surfaces of engine with rag, brush, vacuum or compressed air. · When operating in extremely dirty conditions, remove air intake screen and clean radiator screen (B). Servicing Air Cleaner Elements1. Park machine safely. (See Parking Safely in the SAFETY section.)
5. Remove wing nuts (A), washers, and filter housing (B). 6. If precleaner (C) is dirty, carefully remove paper element and precleaner. Remove precleaner from element (D). 7. If paper element is excessively dirty, replace it with a new element. 8. If precleaner is damaged, replace it. If precleaner is dirty, clean it as follows: a. Wash it in a solution of warm water and liquid detergent. Do not wash paper element. c. Squeeze excess water from precleaner. d. Allow precleaner to air dry. e. Add approximately 30 ml (1 oz) of clean engine oil to precleaner. f. Squeeze precleaner to distribute oil evenly. 9. Install precleaner on paper element and install air cleaner. 10. Install air cleaner cover and wing nuts. Recommended Engine CoolantThe following John Deere coolant is preferred: · COOL-GARD PRE-DILUTED SUMMER COOLANT (TY16036). · COOL-GARD CONCENTRATED SUMMER COOLANT (TY16034) If neither of the above coolants is available, use an ethylene glycol base coolant that meets the following specification: Check container label before using to be sure it has the appropriate specifications for your machine. Use coolant with conditioner or add conditioner to coolant before using. If using concentrate, mix approximately 50 percent antifreeze with 50 percent distilled or deionized water before adding to cooling system. This mixture will provide freeze protection to -37 degrees C (-34 degrees F). Certain geographical areas may require lower temperature protection. See the label on your antifreeze container or consult your John Deere dealer to obtain the latest information and recommendations. Checking Coolant Level1. Park machine safely on a level surface. (See Parking Safely in the SAFETY section.) · If engine is hot, coolant should be up to "H" mark (A) on recovery tank. · If engine is cold, coolant should be at "L" mark (B) on recovery tank. 4. Remove cap (C) from recovery tank if coolant is low. Add ethylene glycol antifreeze (without stop-leak additive) and water in a 50:50 ratio to bring coolant up to proper level. 5. Install and tighten recovery tank cap. 6. Clean debris from air intake screens and radiator. 7. Check condition of hoses. Check for leaks or loose connections. Servicing Cooling SystemDraining Cooling System1. Park machine safely on a level surface. (See Parking Safely in the SAFETY section.) 4. Loosen and remove radiator cap (A) slowly to release all pressure, then tighten cap. 5. Locate hose (B) between water pump and cylinder head on left side of engine. Loosen upper hose clamp with pliers. 6. Position a bucket below the hose. 7. Remove hose from fitting on cylinder head. Drain all coolant into bucket. NOTE: If pressure has been released from radiator and cap is tight, only a small amount of coolant should escape from cylinder head. 8. Install hose and clamp to cylinder head fitting after coolant has drained completely. Flushing Cooling System2. Fill cooling system with clean water and John Deere Cooling System Cleaner, or John Deere Cooling System Quick Flush or an equivalent. Follow directions on the can. 3. Install and tighten radiator cap. 4. Start and run engine until it reaches operating temperature. 6. Drain cooling system immediately before rust and dirt settle. Filling Cooling System3. Fill cooling system. Coolant capacity is 3.1 L (3.3 qt). 4. Install and tighten radiator cap. 5. Run engine until it reaches operating temperature. 7. Check coolant level while engine is hot and after cooling to ensure proper level in recovery tank. If necessary, fill recovery tank to proper level. 8. Tighten hose clamps if necessary. Checking Coolant HosesNOTE: Visually inspect hoses for cracks and wear. Squeeze hoses to check for deterioration. Hoses should not be hard and brittle, nor soft or swollen. Drain cooling system and replace hoses as needed. Replacement of the coolant overflow line does not require draining the system. 1. Park machine safely. (See Parking Safely in the SAFETY section.) 4. Remove air intake screen (A). 5. Loosen hardware securing front shield (B). Swing shield downward. 6. Remove air cleaner cover and filter element. 7. Check radiator hose (C). Replace as needed. Check tightness of clamps (D). 8. Check radiator hose (E) and overflow hose (F) at right side of engine. Replace as needed. Check tightness of clamps (G). 9. Check coolant hose (H) between water pump and cylinder head on left side of engine. Replace as needed. Check tightness of clamps (I). 11. Swing front shield into place and tighten hardware. 12. Install air intake screen. 13. Flush cooling system if necessary. Checking Spark Plugs
1. Park machine safely. (See Parking Safely in the SAFETY section.) 3. Disconnect spark plug wire (A) on each side of engine. 5. Clean each spark plug carefully with a wire brush. · Pitted or damaged electrodes. NOTE: In Canada, replace spark plug with resistor plug only. 7. Replace spark plugs as necessary. 8. Check plug gap (B) with a wire feeler gauge. To change gap, bend outer electrode (C). · Gap must be 0.75 mm (0.030 in.). 9. Install and tighten spark plug. Tighten spark plug to 15 N·m (11 lb-ft). Adjusting CarburetorNOTE: Carburetor is calibrated by the engine manufacturer and is not adjustable. If engine is operated at altitudes above 1829 m (6,000 ft), some carburetors may require a special high altitude main jet. See your John Deere dealer. If engine is hard to start or runs rough, check the troubleshooting section of this manual. Possible engine surging will occur at high throttle with transmission in "N" neutral and mower engagement lever disengaged. This is a normal condition due to the emission control system. After performing the checks in the troubleshooting section and your engine is still not performing correctly, contact your John Deere dealer. Replacing Fuel FilterNOTE: Change filter when fuel is low to prevent excessive fuel spillage. 1. Park machine safely. (See Parking Safely in the SAFETY section.) 4. Place a drain pan under fuel filter (A). 5. Note direction of arrow on fuel filter so new filter can be installed in the same direction. 6. Use a pliers to slide hose clamps (B) away from fuel filter. 7. Disconnect hoses from filter.
8. Make sure arrow on new filter is pointing in the direction of fuel flow. Connect hoses to filter. |
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