Specifications, Service and Repair of Farm and Lawn Tractors

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John Deere 3025E Engine and Driveline


John Deere 3025E Engine

Checking Engine Oil Level

Check engine oil when engine is cold. If engine is warm, allow to cool for at least 5 minutes before checking oil. Check engine oil with machine parked on a level surface. Remove dipstick, located at the right side of the engine. Wipe with a clean cloth. Install dipstick. Remove dipstick. If oil level is low: Raise hood. Remove right side panel. Remove oil fill cap. Add recommended engine oil until level is within operating range on dipstick. Do not overfill. Install dipstick. If oil is above level on dipstick, drain to proper level. Install right side panel. Lower hood.

Changing Engine Oil and Filter

Run engine to warm the oil. Place drain pan under oil drain plug located on under side of engine. Remove drain plug. Wipe dirt from around oil filter. Turn filter counterclockwise to remove. Put a light coat of clean engine oil on gasket of new filter. Install replacement oil filter by turning filter clockwise until gasket contacts filter base. Tighten additional one half turn. Install drain plug. Do not overtighten. Remove oil fill cap. Add approximately 4.5 L (1.2 gal.) engine oil. Install oil fill cap. Start and run engine at idle to check for leaks. Stop engine. Fix any leaks before operating. Check engine oil level. Add oil if necessary.

Cleaning Dust Unloading Valve

Allow engine to cool. Access the engine compartment. Squeeze dust unloading valve to clean. Remove and replace if damaged.

JD 3025E - Servicing Air Filter Elements

Allow engine to cool. Raise hood. Remove hold down strap. Tilt canister up and release latches and remove air filter canister cover. Remove and discard primary element. Clean out any dirt in canister, taking care not to damage secondary filter element. Replace with a new primary filter element. Install air filter canister cover with rubber dust unloading valve pointing downward. Secure latches. Position canister back in place and install hold down strap. Check instructions molded into canister cover for proper installation. Lower hood.

Servicing Secondary Air Filter Element

Secondary element does not need routine replacement. Visually inspect it without removing from canister. Do not attempt to clean secondary element. If secondary element is replaced, install new primary and secondary element immediately to prevent dust from entering air intake system. Remove air filter canister cover. Remove and discard primary air filter element. Remove and discard secondary air filter element. Replace with a new secondary air filter element. Install new primary air filter element. Replace air filter canister cover. Position canister back in place and install strap. Lower hood.

Checking Air Filter Hose

Inspect air intake system hoses and connections each time the air filter is changed, or at a minimum yearly. Raise hood. Visually inspect hose for cracks and wear. Squeeze hose to check for deterioration. Hose should not be hard and brittle, nor soft or swollen. Tighten upper and lower clamps if necessary. Lower hood.

John Deere 3025E Cooling System

Checking Cooling System

Allow engine to cool. Raise hood. If engine is warm, coolant level should be between the FULL line and the LOW line. If engine is cold, coolant level should be at the LOW line on the recovery tank. Remove recovery tank cap if needed to add coolant. Add recommended coolant. Install recovery tank cap. Lower hood.

Draining Cooling System

Allow engine to cool. Raise hood. Slowly open radiator cap to the first stop to release all pressure. Close radiator cap tightly. Position drain pan under radiator. Remove lower radiator hose at radiator. Drain coolant from engine: Locate engine block drain plug at right side of engine, behind oil filter. Position drain pan under drain plug, remove drain plug and allow all coolant to drain. When coolant drains from the recovery tank, remove the radiator cap. Install lower radiator hose and install engine block drain plug. Flush cooling system.

JD 3025E - Flushing Cooling System

Fill cooling system with clean water and JD Cooling System Cleaner, or Cooling System Quick Flush or an equivalent. Follow directions on the container. Install and tighten radiator cap. Start and run engine until it reaches operating temperature. Stop engine. Remove lower radiator hose and engine block drain plug. Drain cooling system immediately before rust and dirt settle. Install radiator and engine block drain plug.

Filling Cooling System

Do not operate engine with plain water. Allow radiator to cool. Fill cooling system. Cooling system capacity is 3.7 L (3.9 qt). Install and tighten radiator cap. Run engine until it reaches operating temperature. Stop engine. Check recovery tank coolant level and add coolant if necessary Lower hood.

Checking Radiator Hoses and Clamps

Raise hood. Remove right and left-hand side panels. Visually inspect hoses for cracks and wear. Squeeze hoses to check for deterioration. Hoses should not be hard and brittle, nor soft or swollen. Check upper radiator hose for damage or cracking. Replace if necessary. Check hose clamps as needed. Check lower radiator hose for damage or cracking. Replace if necessary. Check hose clamps as needed. Install right and left-hand side panels. Lower hood.

Cleaning Radiator Cooling Fins

Reduced air intake can cause overheating. Keep radiator cooling fins clean. Do not use pressure washers to clean radiator cooling fins. Reduce compressed air pressure to 210 kPa (2.1 bar) (30 psi) when cleaning radiator and cooling fins. Spray compressed air straight into radiator. Do not spray radiator on an angle or cooling fins can be bent. Raise hood. Using compressed air or water, remove all dirt and debris from fins at front and rear of the following: Radiator, including fan shroud. Transmission oil cooler. Fuel cooler. Lower hood.

John Deere 3025E Alternator Belt

Checking Belt Tension

Equipment: JDG529 or JDST28 Belt Tension Gage. Raise hood. Remove left side panel. Use belt tension gage or apply moderate thumb pressure to belt halfway between the pulleys. Adjust belt tension if not within specifications. Belt Tension Force - 75 LB (or 334 N). Belt Deflection Inward Pressure - 9 mm (3/8 in.).

Adjusting Belt Tension

Loosen adjusting bolt and pivot bolt. Apply outward pressure to alternator housing until tension is correct. Tighten bolts. Check belt tension. Install left side panel. Lower hood.

Replacing Belt

Replace alternator belt if excessive wear, damage, or stretching is detected. Remove left side panel. Loosen adjusting bolt and pivot bolt. Apply inward pressure to alternator housing. Remove belt from alternator pulley, fan pulley, and crankshaft pulley. Route belt over fan and remove. Install new belt over fan and onto pulleys. Apply outward pressure to alternator housing until tension is correct. Tighten bolts. Check belt tension. Adjust as necessary. Install left side panel. Lower hood.

JD 3025E - Fuel Filter Sediment Bowl and Replacing Filter

Checking Sediment Bowl

Check fuel sediment bowl. If water and deposits are detected, drain water. Place drain pan under sediment bowl. Turn drain cock to open position. Drain water until the orange indicator ring re-seats back on the bottom of bowl. Turn drain cock to closed position.

Cleaning Sediment Bowl and Replacing Fuel Filter

Move the fuel shutoff valve to closed position. Position drain pan under fuel filter sediment bowl. Turn sediment bowl counterclockwise to remove. Clean the filter screen and bowl. Install sediment bowl. Open fuel shutoff valve. Fuel system is self bleeding. Turn key to the ON position for 10-15 seconds before attempting to start, electric pump purges air from sediment bowl.

Replacing Fuel Filter

Change filter when fuel level is low. Close fuel shutoff valve. Position drain pan under fuel filter to catch fuel spillage. Turn filter counterclockwise to remove and discard. Apply fuel to surface of new filter gasket. Install new filter to filter head. Tighten to one complete turn after filter contacts head. Open fuel shutoff valve.

John Deere 3025E - Starting Engine

Apply park brake. Move the transmission range shift lever to the N position. Make sure PTO engagement switch is in disengaged/off position. Remove foot from forward and reverse travel pedals. Lower any front mounted implement to the ground using the SCV lever (if equipped). Set engine speed control lever to the 1/2-3/4 fast position. Turn ignition key switch to the run position. Check instrument panel indicator lights: Alternator/battery discharging light illuminates. Engine oil pressure light illuminates. Turn key to start position to start engine.

Release key after engine has started. If engine does not start, cycle the key back to the off position and restart the procedure. Check indicator lights: Engine oil pressure light goes out within 5 seconds. If indicator light does not go out after 10 seconds, set engine speed at full throttle. Battery charging light should go out within 10 seconds. If indicator lights stay on longer than the given time interval, stop engine and check for cause. Set engine speed control lever to the 1/2 fast position for 1 minute without load.

Cold Weather Starting

Apply park brake. Move the transmission range shift lever to the N position. Turn ignition key switch to the run position. When glow plug icon light turns off, then turn key to start position. Starter may be damaged if starter is operated for more than 20 seconds at a time: Wait two minutes before trying again if engine does not start. Release key when engine starts. Check instrument panel indicator lights: Engine oil pressure light should go out within 5 seconds. Alternator/battery discharging light should go out within 10 seconds.

If indicator light remains on after 10 seconds, set engine speed to full throttle. If indicator light continues to stay on, stop the engine and check for cause. It is normal for the engine to be louder and for blue-white exhaust smoke to be present during engine warmup. The amount of exhaust smoke depends on air temperature. Warm the engine: In warm weather, set engine speed control lever to the 1/2 fast position for 1 minute without load. In cold weather, set engine speed control knob to the 1/2 fast position for 5 minutes without load.

JD 3025E - Idling Engine

Adjust engine speed control lever to set engine at low idle. Apply park brake.

Starting a Stalled Engine

Disengage PTO. Remove foot from forward and reverse travel pedals. Move transmission range shift lever to neutral (N). Start engine. Continue with normal operation, or set engine at low idle for 2 minutes before stopping engine.

John Deere 3025E Transmission

Checking Transmission Oil Level

Dirt and contamination can enter transmission when checking oil level. Clean area around dipstick before removing. Pull to remove dipstick, located at left side of transaxle. Wipe with a clean cloth. Install dipstick. Remove dipstick. Check oil level on dipstick. Correct oil level is between levels on dipstick. Do not overfill transmission. Oil expands during operation and could overflow. If oil level is low: Remove filler cap. Add recommended oil through fill opening until oil level is correct. If oil is exceeds top mark on the dipstick, drain to proper level. Install dipstick. Install and tighten filler cap.

Changing Transmission Oil and Hydraulic Suction Oil Filter

Drive tractor a few minutes to warm and mix transmission oil. Park machine safely. Position drain pan under transmission drain plug at rear cover, suction filter assembly, and spin-on pressure filter at left side of transmission. Remove plug and allow oil to drain. Remove suction filter and allow oil to drain. Remove HST filter and allow oil to drain. Install transmission drain plug. Replace both filters. Remove oil fill cap. Add recommended oil into filler opening. Start engine. Check for oil leaks around filter bases and drain plugs. Stop engine. Check transmission oil level. Add oil if necessary.

John Deere 3025E Front Axle

Checking Front Axle Oil Level

Allow oil one hour to settle before checking level to ensure accurate dipstick reading. Repeat oil level check after several hours of operation. Allow machine to cool down for at least 1 hour. Dirt and debris in oil damages the transaxle. Clean area around opening before removing dipstick. Loosen and remove dipstick located on right side of front axle. Wipe dipstick clean with a rag. Install and tighten dipstick. Remove dipstick. Correct oil level is between high and low levels on dipstick. If oil level is low: Add recommended oil through dipstick fill opening until oil level is correct. Install and tighten dipstick. Check front axle oil level again after the first several hours of operation.

Changing Front Axle Oil

Operate machine to warm front axle oil. Position drain pan under differential drain plug. Remove differential drain plug and allow oil to drain. Position drain pan under each front axle drain plug. Remove both drain plugs and allow oil to drain. Install and tighten both drain plugs after all oil has drained. Remove dipstick located on right side of front axle. Add recommended oil through dipstick fill opening until oil level is correct. Install and tighten dipstick. Drive tractor 1 minute at low speed, in both forward and reverse to help fill wheel ends. Check front axle oil level.

Adjusting Front Axle Thrust Bolt Torque

Adjust bolt torque at required service interval to prevent excessive forward or rearward movement of front axle. Raise front axle off ground to take machine weight off the front axle. Loosen nut. Tighten thrust bolt. Thrust Bolt Torque - 14 Nm (10 lb-ft.). Do not overtighten. Oscillate axle from stop ti stop. Check torque. Tighten back nut. Lower front axle back to ground.

John Deere 3025E - MFWD Checking

Checking and Adjusting Toe-In

Stop machine on a firm, level surface. Disengage MFWD if equipped. Turn steering wheel so front wheels are pointing straight ahead.

Checking Toe-In

If front axle is equipped with bar tires, use either an outside or inside bar of each tire for marking the center line. Mark the center line of each tire at hub height and to the front of the axle using chalk. Measure and record distance between center lines of each tire. Drive machine forward or rearward slightly until chalk mark moves 180° to rear of axle. Measure and record distance again between the chalk marks. Determine the difference between front and rear measurements. Difference between measured distance not to exceed 3 mm (1/8 in.). Adjust toe-in if necessary.

Adjusting Toe-In

Loosen nuts on both ball joints. Rotate tie rod clockwise or counterclockwise to adjust the amount of toe-in. Adjust tie rod until toe-in measurement is within correct specification. Rotating threaded rod in 1/2 turn increments equals 1.5 mm (1/16 in.). Tighten nuts to 120 Nm (88 lb.-ft.). Check toe-in setting. Repeat procedure if further adjustment is required.

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