Specifications, Service and Repair of Farm and Lawn Tractors

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New Holland Boomer 55 Troubleshooting

Boomer 55 Diesel Engine Troubleshooting

Engine starts hard or doesn't start: Fuel filter plugged. Clean the filter element. Air in the fuel pipes. Bleed the fuel pipes. Fuel injection nozzles are damaged. Service or change injection nozzles. Fuel injection pump is not working correctly. Rebuild or install a new injection pump.

Engine stalls after running: Fuel injection pump timing is wrong. Adjust as recommended. Fuel filter plugged. Change the filter element. Engine is not preheated. Warm up engine as required.

Diesel starts but immediately stops: Fuel filter plugging. Change filter element. Fuel injection pump is broken. Install a new fuel pump or repair. Clogged air filter. Replace air filter element.

Engine is overheated: Damaged radiator cap or dirty radiator core. Clean radiator or replace cap. Engine has a lack of coolant. Refill to the correct level and inspect system for leaks. Broken or loose fan belt. Fan belt must be replaced. Engine oil insufficient. Check oil level and add oil as required.

Engine power is reduced: Clogged or defective injection nozzles. Change fuel injection nozzles. Dirt in the fuel lines or hoses. Service fuel lines and hoses. Plugged air filter. Change air filter element. Leaking cylinder head gasket. Replace cylinder head gasket.

Abnormal engine knocking or noise: Engine not warmed up. Warm up to required temperature. Low engine oil level. Check oil level and add oil as required. Timing of fuel injection pump is incorrect. Adjust according to specifications. Pistons are broken or worn. Pistons need to be replaced. Faulty or misaligned connecting rod. Need to replace or align the connecting rod.

Engine stalls when idle: Too low idle RPM. Test and adjust. Valve clearance is out of adjustment. Adjust valve clearance. Fuel injection pump is defective. Change pump or rebuild it.

Low oil pressure: Lack of oil. Fill up the engine oil. Defective oil pump. Repair or change. Clogged oil filter. Replace or clean engine oil filter element.

Boomer 55 Transmission Troubleshooting

Transmission is excessively noisy: Gears are damaged or backlash is incorrect. Change the gears or set backlash properly. Worn or bent gear shift forks. Replace defective shift forks. Worn or stuck shaft splines. Replace defective shaft. Lack of transmission fluid. Need to add transmission fluid. Bearings are broken or worn. Replace faulty bearings. Transmission oil is contaminated. Change the oil.

Hard shifts: Gear shift linkage is corroded or worn. Change or lubricate shift linkage. Worn or improperly adjusted clutch. Adjust or change the clutch. Worn or bent shift forks. Shift forks need to be replaced. Defective parts in the gearshift mechanism. Replace defective parts.

Lack of transmission oil pressure: Transmission oil insufficient. Fill up the transmission oil. Transmission oil filter is clogged (if fitted). Service or change transmission oil filter. Relief valve is damaged. Replace valve as required.

Transmission oil leakage: Damaged gaskets or seals. Gaskets or seal replacement required. Transmission oil level is exceeded. Correct the oil volume.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission is excessively noisy: Speed control linkage is defective or unadjusted. Adjust or replace linkage. Excessive loading. Reduce loading. Fluid is contaminated or fluid level is insufficient. Fill to required level or change the fluid. Stuck relief valve. Replace relief valve. Worn or defective transmission components. After disassembling and inspection, change defective components.

Transmission oil overheats: Transmission overload. The load should be reduced. Cooling components are damaged or clogged. Inspect all cooling components and replace or repair if necessary. Transmission oil level is low. Fill the transmission housing with oil. Transmission fluid filter element clogging. Clean or change transmission fluid filter.

Power is insufficient: Insufficient transmission fluid. Checking transmission fluid level and add if necessary. Relief valve malfunction. Replace the valve. Defective or not adjusted speed control pedal linkage. Adjust or repair linkage.

Transmission oil leaking: Plugged transmission fluid return tube. Service or replace return tube. Seals or gaskets are broken. Replace worn seal or gaskets. High internal transmission housing pressure. Repair or replace damaged components.

Boomer 55 Hydraulics Troubleshooting

Hydraulic system is overheated: Improper hydraulic oil type. The proper type of hydraulic oil must be used. Hydraulic fluid is contaminated. Fill up with new hydraulic fluid. Air in hydraulic pipes. Bleed hydraulic pipes. Defective main relief valve. Relief valve replacement required.

Hydraulic oil pressure is insufficient: Hydraulic oil is insufficient. Need to add oil. Clogged hydraulic oil filter. Clean or change hydraulic filter. Hydraulic piping is leaking. Check the hydraulic system and fix leaks. Hydraulic control valve is not set properly. Adjust properly. Hydraulic pump not working. Replace or repair hydraulic oil pump. Hydraulic cylinder not working. Install a new hydraulic cylinder or repair it.

Hitch can't lift or lifts too slowly: Damaged hydraulic pump. Repair or replace hydraulic oil pump. Main relief valve is faulty. Relief valve need to be replaced. Defective hydraulic control valve. Install a new hydraulic valve or repair it. Broken hydraulic cylinder. Repair or change hydraulic cylinder. Low hydraulic fluid level. Fill the system to proper hydraulic fluid level. Hydraulic fluid filter element is clogged. Replace filter element or clean if required. Excessive hitch loading. The load should be reduced.

Hitch fails to drop or drops slowly: Hydraulic cylinder is defective. Install a new hydraulic cylinder or repair it. Incorrect setting hydraulic control valve. Use the correct adjustment. Lift arm shaft is damaged. Change the shaft. The three-point hitch is not adjusted. The three-point hitch must be adjusted.

Hitch lower or lift is jerky: Hydraulic oil contamination. Change the oil. Faulty hydraulic pump. Repair or replace hydraulic fluid pump. Air in hydraulic lines. Bleed hydraulic lines. Faulty hydraulic control valve. Replace or repair the valve. Hydraulic cylinder is broken. Install a new hydraulic cylinder or repair it.

Boomer 55 Steering System Troubleshooting

Excessive steering wheel free play: Steering column coupling or shaft has maximum wear. Replace defective part. Faulty steering pump. Repair or replace steering pump. Loose or worn steering linkage parts. Inspect and replace as required. Power steering control valve has damage or wear. Replace or repair control valve as required.

Steering wheel is difficult to turn: Air in steering system. Bleed the system of air. Steering filter is plugged. Clean steering filter element. Steering fluid level is insufficient. Add oil to steering system. Faulty or worn power steering control valve. Change or repair steering control valve if required. Defective hydraulic steering pump. Install a new steering pump. Stuck or faulty steering pump control valve. Replace or clean flow control valve. Improperly assembled or defective steering column. Reassemble or change the steering column. Tyre pressure is uneven. Adjust the tyre pressure. Not adjusted toe-in. Check toe-in and correct. Steering cylinder leaks. Change worn piston seals or damaged piston rod.

Front wheels wander to right or left: Power steering control valve has malfunction or wear. Replace or repair control valve as required. Faulty steering cylinder. Replace or repair steering cylinder. Improper toe-in. Adjust toe-in wheels. Steering linkage assembly is worn or loose. Replace or repair steering linkage. Incorrectly adjusted or worn front wheel bearings. Adjust correctly or change bearings. Front tyres are worn unevenly. Install new tyres.

Boomer 55 Electrical Troubleshooting

Battery does not charge: Electrical wire connections are corroded or loose. Service or tighten connections. Faulty battery terminal clamps. Terminal clamps should be changed. Faulty cell in battery. Use a new battery. Belt is damaged or loose. Adjust belt tension or install a new belt.

Starter motor cranks slow: Low battery power. Recharge the battery. Battery won’t hold charge. Battery needs to be serviced or replaced. Bad terminals or disconnected battery cables. Check cable connections and change or clean terminals.

Starter motor is not working: Battery is low or faulty. Change or recharge battery. Battery cables are disconnected or improperly connected. Inspect cables and connect properly. Low battery output voltage. Charge the battery. Defective starter motor. Starter needs to be changed.

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