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| Home / Farm Tractors / Mahindra Tractors / Mahindra 2638HST |
Mahindra 2638HST Troubleshooting
The
Mahindra 2638 HST compact utility tractor was manufactured between 2018 and
2023. The Mahindra 2638HST driveline consists of four-cycle four-cylinder direct
injection water-cooled diesel engine and 3-range hydrostatic transmission with
infinite forward and reverse gears. 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 37.5 hp (28 kW). The maximum forward speed - 14.9 mph (23.8 km/h), maximum
reverse speed - 11.9 mph (19 km/h).
The open center hydraulic system includes a gear pump with rated fluid flow of 7.6 gpm (28.8 lpm). The Mahindra 2638 HST is equipped with a hydrostatic power steering system, wet disc brakes, 7.00x16 (AG) or 10.0-16.5 (Industrial) front tyres, and 11.2x24 (AG) or 43x16-20 (Industrial) rear tyres. The wheelbase is 90 inches (2280 mm). The tractor is compatible with Mahindra 2638L front end-loader with a maximum lift height of 101.4" (2570 mm), and Mahindra 60B backhoe with maximum digging depth of 95" (2410 mm).
| Engine Troubleshooting |
| Engine difficult to start or will not start |
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter plugged - Clean or replace the filter.
Fuel injection nozzles are clogged or faulty - Install a new kit of correctly balanced nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Correct valve clearance.
Fuel injection pump is defective - Repair or install new pump.
| Diesel starts but immediately shuts off |
Dirty air filter - Change air filter element.
Fuel filter element is clogged - Replace the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Clean fuel injectors or change it.
Fuel injection pump is not operating properly - Rebuild or replace pump.
| Diesel shuts off while driving |
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Fuel filter plugging - Change the filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
| Engine stalls while idling |
Too low idle RPM - Adjust low idling as recommended.
Damaged fuel injection pump - Install a new pump or rebuild.
Clogged or defective injectors - Replace or clean fuel injectors.
Improper valve clearance - Adjust valve clearance.
| Diesel engine is losing power |
Air filter is dirty - Install new air filter element.
Clogged or defective injection nozzles - Clean or replace injection nozzles.
Uneven fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
The valve clearance is not adjusted - Check and adjust.
Incorrectly set low idle speed - Normalize low idle speed.
Fuel lines or hoses clogging - Clean fuel lines and hoses.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Leaking or damaged piston rings - Replace the piston rings as required.
| Engine overheats |
Not enough coolant - The cooling system needs to be refilled and checked for faults.
Engine oil insufficient - Check and refill engine oil.
Radiator fins are dirty or radiator cap is defective - Change cap or clean radiator.
Fan belt is broken or worn - Replace the fan belt.
Diesel engine is overloaded - Reduce the load or use a lower gear.
| Oil pressure is low |
Lack of oil - Add oil as required.
Oil filter is dirty - Change or service engine oil filter.
Oil grade or viscosity is wrong - Use proper viscosity oil.
Incorrect crankshaft bearing oil clearance - Change bearings.
Oil pump is damaged - Replace as required.
| Abnormal engine knocking or noise |
Low engine oil level - Fill up the engine oil.
Low coolant temperature - Warm up to required temperature.
Fuel injection pump timing is not adjusted - Adjust fuel injection pump as required.
Too low idle RPM - Correct the settings.
Fuel injectors are faulty or clogged - Replace or clean fuel injectors.
Misaligned or faulty connecting rod - Need to replace or align the connecting rod.
Worn or broken pistons - Have pistons replaced.
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission is making noise |
Fluid is contaminated or fluid level is insufficient - Fill to required level or change the fluid.
Bent or unadjusted speed control pedal linkage - Repair or adjust linkage.
Relief valve is stuck - Change the valve.
Excessive transmission load - The load should be reduced.
Worn or defective transmission components - After disassembling and inspection, change defective components.
| Low power |
Low oil level - Need to add transmission oil.
Stuck relief valve - Change the valve.
Speed control pedal linkage is bent or not adjusted - Adjust or replace linkage.
| Transmission oil overheated |
Transmission oil level is low - Check and refill the transmission oil.
Clogged transmission oil filter element - Service or change transmission oil filter.
Cooling components are defective or plugged - Inspect all cooling components and service or replace if necessary.
Excessive loading - Reduce the load is required.
| External fluid leaks |
Broken seals or gaskets - Change defective gaskets or seal.
Transmission case internal pressure is too high - Replace worn components.
Oil drain pipe is plugged - Check pipe and service if necessary.
| Hydraulics Troubleshooting |
| Insufficient hydraulic oil pressure |
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Dirty hydraulic oil filter element - Clean or change hydraulic filter.
Faulty hydraulic pump - Repair or replace hydraulic fluid pump.
Incorrect adjusted hydraulic control valve - Adjust correctly.
Hydraulic cylinder is broken - Repair or change hydraulic cylinder.
Leaks in hydraulic pipes - Identify leaks in the system and repair it.
| Hydraulic system overheating |
Defective main relief valve - Relief valve must be changed.
Improper type of hydraulic oil - Use the proper type of oil.
Dirty hydraulic oil - The oil must be changed.
Air in the hydraulic system - Air bleeding.
| Hitch won't raise or raises slowly |
Heavy load on the hitch - The load should be reduced.
Insufficient hydraulic fluid - Add fluid as required.
Hydraulic fluid filter element is clogged - Service or replace the hydraulic filter.
Hydraulic pump not working - Replace or repair hydraulic fluid pump.
Damaged main relief valve - Relief valve replacement required.
Faulty hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic cylinder is broken - Install a new hydraulic cylinder or repair it.
Suction line is disconnected or broken - Replace or connect correctly.
| 3-point hitch does not lower or lowers very slowly |
Hydraulic spool valve is not set properly - Set the spool valve properly.
Hydraulic cylinder not working - Repair or install a new hydraulic cylinder.
Hitch is out of adjustment - The hitch must be adjusted.
Lift arm shaft is worn - Replace the shaft.
| Hitch lift or drop is jerky |
There is air in the hydraulic system - Bleed hydraulic system.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Hydraulic pump is faulty - Repair or replace hydraulic fluid pump.
Faulty hydraulic control valve - Replace or repair the valve.
Hydraulic cylinder is faulty - Install a new hydraulic cylinder or repair it.
| Steering System Troubleshooting |
| Difficult steering |
Worn or incorrectly fitted steering column - Replace the steering column or refit it correctly.
Air in the hydraulic steering system - Need to bleed air.
Improper toe-in - Check toe-in and correct.
Uneven tire pressure - Inflate the tires properly.
Steering pump failure - Repair or change steering pump.
Stuck or worn pump flow control valve - Replace or clean flow control valve.
Steering oil level is low - Fill up steering oil to required level.
| Excessive play in steering |
Steering column shaft or coupling has maximum wear - Change faulty component.
Steering pump failure - Check the steering pump and replace if necessary.
Worn or loose steering linkage joints - Inspect and replace as required.
| Front wheels wander to right or left |
Front tyres wear unevenly - Change the tyres.
Incorrect toe-in - Check and adjust toe-in.
Loose or worn steering linkage components - Inspect and replace as required.
Front wheel bearings are damaged or incorrectly adjusted - Adjust properly or replace bearings.
| Electrical Troubleshooting |
| Battery is not charging |
Corroded or loose cable connections - Service or tighten connections.
Faulty battery terminal clamps - Install new terminal clamps.
Battery failing - Change the battery.
Belt is defective or loose - Adjust belt tension or change the belt.
| Starter turns slowly |
Low battery voltage - Battery needs to be recharged.
Battery is draining quickly - Battery needs to be serviced or replaced.
Wires are disconnected or battery terminals are corroded - Check cables and clean or change terminals.
| Starter is not working |
Battery is drained or worn - Recharge or change battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery capacity - Battery is drained, recharge it.
Damaged starter motor - Starter should be changed.
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| Farm Tractors Technical Specifications |