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Home / Farm Tractors / Mahindra Tractors / Mahindra 3550

Mahindra 3550 Troubleshooting

The Mahindra 3550 utility tractor was manufactured between 2015 and 2019. The Mahindra 3550 tractor is powered by four-cycle four-cylinder direct injection liquid-cooled diesel engine. A 166.7 cubic inches (2.7 L) engine has a cylinder bore of 3.5" (89 mm), piston stroke of 4.33" (110 mm), and rated power of 49 hp (36.5 kW). The Mahindra 3550 is fitted with a 2 transmission options: 12x12 full synchromesh transmission, or three-range hydrostatic transmission. The maximum forward speed - 15.3 mph (24.5 km/h), maximum reverse speed - 14.4 mph (23 km/h).

The open center hydraulic system includes a gear pump with rated fluid flow of 11.0 gal/min (41.6 l/min). The main relief pressure is 200 bar (2900 psi). The tractor is equipped with a hydrostatic power steering system, wet disc brakes, 31x13.50-15 front tyres, and 21.5L-16.1 rear tyres. The tractor is compatible with Mahindra 3550L front end-loader with a maximum lift height of 111.5" (2830 mm), and Mahindra 50B backhoe with maximum digging depth of 115" (2920 mm).

Diesel Engine Troubleshooting
Engine starts up hard or doesn't start

Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element is clogged - Replace the filter element.
Defective or clogged injection nozzle - Replace injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump is not operating properly - Replace or repair injection pump.

Engine starts and stalls suddenly

Restricted intake air - Change air filter element.
Fuel filter plugged - Replace the filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Dirty or defective injectors - Replace fuel injectors.
Fuel injection pump is not operating properly - Rebuild or change fuel pump.

Engine stops running suddenly

Coolant temperature is low - Engine is not warmed up to the required temperature.
Fuel filter element is dirty - Replace the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged or defective injection nozzles - Clean or replace injection nozzles.
Fuel injection pump timing is wrong - Adjust as recommended.

Engine stalls while idling

Incorrectly set low idle speed - Normalize low idle speed.
Fuel injection pump malfunction - Repair or install a new fuel pump.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Valve clearance is wrong - Adjust valve clearance according to specifications.

Engine power is insufficient

Clogged air filter element - Carry out maintenance on air filter.
Defective injection nozzle - Replace injection nozzles.
Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
The valve clearance is not adjusted - Adjust to proper valve clearance.
Incorrect low idle speed adjustment - Need to adjust idle speed.
Fuel lines or hoses are dirty - Clean fuel lines and hoses.
Worn cylinder head gasket - Change cylinder head gasket.
Damaged or leaking piston rings - Piston rings need to be replaced.

Engine is overheated

Insufficient coolant - Add coolant fluid and inspect the cooling system for leaks.
Engine oil insufficient - Fill up the oil to required level.
Dirty radiator core or faulty radiator cap - Change cap or clean radiator.
Fan belt slipping or worn - Change the fan belt.
Engine overload - Load reducing required.

Insufficient oil pressure

Engine oil insufficient - Fill up the engine oil.
Engine oil filter is plugged - Service or replace engine oil filter.
Oil grade or viscosity is wrong - Use correct viscosity oil.
Crankshaft bearing has incorrect oil clearance - Replace bearings.
Defective oil pump - Repair or replace.

Abnormal engine knocking or noise

Engine oil level low - Need to add engine oil.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Fuel injection pump timing is wrong - Set up as recommended.
Incorrect low idle setting - Adjust the low idle speed.
Damaged or clogged injectors - Test and replace fuel injectors if necessary.
Misaligned or faulty connecting rod - Align or change connecting rod.
Worn or scored pistons - Replace the pistons.

Transmission Troubleshooting
Transmission oil pressure is low

Transmission fluid insufficient - Need to add transmission fluid.
Transmission fluid filter is clogged (if fitted) - Replace or service transmission fluid filter.
Defective relief valve - Replace the valve.

Transmission noise

Lack of transmission fluid - Need to add transmission fluid.
Transmission oil is contaminated - Change the oil.
Defective gears or improper backlash - Replace defective gears or set backlash properly.
Worn or broken bearings - Faulty bearings should be replaced.
Worn or bent shift forks - Shift forks need to be changed.
Shaft splines are worn or stuck - Change the shaft.

Difficulty shifting gears

Worn or rusty gear shift linkage - Shift linkage need to be replaced.
Damaged or worn gear shift forks - Shift forks need to be replaced.
Worn out parts of the gearshift mechanism - Replace worn parts.
Clutch is out of adjustment or defective - Clutch needs to be adjusted or changed.

Transmission oil leaks

Transmission fluid level is high - Correct the fluid level.
Broken seals or gaskets - Install new components.

Hydrostatic Transmission Troubleshooting
HST transmission noises

Fluid is contaminated or fluid level is insufficient - Fill to required level or change the fluid.
Speed control linkage is worn or unadjusted - Adjust or install new linkage.
Defective relief valve - Change the valve.
Excessive loading - The load should be reduced.
Defective or worn transmission parts - After disassembly and inspection, replace defective components.

Loss of power

Lack of transmission fluid - Checking transmission fluid level and add if necessary.
Relief valve is stuck - Replace relief valve.
Speed control linkage is worn or unadjusted - Adjust or change linkage.

Transmission fluid overheated

Transmission fluid insufficient - Fill the transmission housing to proper fluid level.
Dirty transmission fluid filter element - Service or replace the transmission fluid filter.
Cooling components are clogged or damaged - Inspect all cooling components and replace or clean if necessary.
Transmission overloaded - The load should be reduced.

Transmission oil leaks

Damaged gaskets or seals - Seals and gaskets replacement required.
Transmission case internal pressure is too high - Change defective parts.
Oil drain pipe is plugged - Check pipe and service if necessary.

Hydraulics Troubleshooting
Hydraulic oil pressure is low

Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Hydraulic oil filter is clogged - Clean the hydraulic filter element or replace if necessary.
Hydraulic pump is defective - Replace or repair hydraulic fluid pump.
Hydraulic control valve block is out of adjustment - Control valve needs to be adjusted.
Broken hydraulic cylinder - Repair or replace hydraulic cylinder.
Leaks in hydraulic lines - Check the system and repair leaks.

Hydraulic system is too hot

Damaged main relief valve - Relief valve replacement required.
Wrong hydraulic fluid type - Pour the proper type of fluid.
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil.
There is air in the hydraulic system - Bleed hydraulic system.

3-point hitch can't lift or lifts too slowly

Excessive hitch loading - The load should be reduced.
Hydraulic oil level low - Checking hydraulic oil level and add if necessary.
Dirty hydraulic fluid filter - Hydraulic filter maintenance required.
Hydraulic pump malfunction - Replace or repair hydraulic fluid pump.
Main relief valve is damaged - Relief valve need to be replaced.
Damaged hydraulic control valve - Install a new valve or repair it.
Hydraulic cylinder not working - Change or repair hydraulic cylinder.
Suction line is disconnected or broken - Replace or connect correctly.

Hitch won't drop or drops slowly

Incorrect setting hydraulic control valve block - Set correctly.
Hydraulic cylinder failure - Replace or repair hydraulic cylinder.
The three-point hitch is not adjusted - Adjustment is required.
Damaged hitch cross shaft - Install a new shaft.

Hitch drop or lift is jerky

Air in hydraulic system - Bleed air from hydraulic system.
Hydraulic fluid contamination - Change hydraulic fluid.
Defective hydraulic pump - Replace or repair hydraulic fluid pump.
Hydraulic control valve block is damaged - Change or repair hydraulic valve.
Hydraulic cylinder is broken - Repair or replace hydraulic cylinder.

Steering Troubleshooting
Steering is stiff

Damaged or incorrectly assembled steering column - Replace steering column or assemble correctly.
Air in steering hydraulic system - Air-bleed steering system.
Incorrect toe-in - Adjust toe-in properly.
Tire pressure uneven - Inflate the tires correctly.
Steering pump stopped working - Check the hydraulic steering pump and change if necessary.
Steering pump control valve is stuck or faulty - Service or change control valve.
Lack of steering fluid - Need to add steering oil.

Steering wheel has too much free-play

Worn steering column coupling or shaft - Change faulty component.
Faulty steering pump - Check the hydraulic steering pump and change if necessary.
Steering linkage parts are loose or worn - Repair or replace steering linkage.

Tractor pulls to left or right

Uneven wear on front tyres - Replace the tyres.
Improper toe-in - Check toe-in and correct.
Steering linkage parts are loose or worn - Repair or change steering linkage.
Improperly adjusted or defective front wheel bearings - Adjust correctly or replace bearings.

Electrical Troubleshooting
Battery cannot be charged

Wiring connections are loose or corroded - Clean or tighten connections.
Faulty battery terminal clamps - Change terminal clamps.
Faulty cell in battery - Install a new battery.
Belt is loose or defective - Adjust belt tension or change the belt.

Starter motor turns slow

Low battery power - Recharge the battery.
Battery runs out quickly - Battery needs to be serviced or replaced.
Disconnected wiring or bad battery terminals - Check cable connections and change or clean terminals.

Starter does not work

Battery is drained or worn - Need to charge or replace the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery output - Low battery charging, charge as required.
Starter motor failing - Repair or install a new starter.

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