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John Deere D170 Troubleshooting

The John Deere D170 lawn tractor was manufactured between 2011 and 2017. The components of John Deere D170 driveline system: Briggs and Stratton 44P777 4-cycle vertical-shaft V-twin cylinder air-cooled gasoline engine and Kanzaki Tuff Torq HD K46 belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 44.2 cubic inches (724 cc) engine has a cylinder bore of 3.12" (79 mm), piston stroke of 2.89" (73 mm), rated power of 26 hp (19.4 kW), and 56.4 Nm (41.8 lb-ft) of peak torque at 2400 rev/min.

Max travel speed (forward/reverse): 5.5 mph (8.8 km/h) and 3.2 mph (5.1 km/h). The John Deere D170 is equipped with a manual steering system, mechanical shoe brakes, 16x6.50-6 front tires, and 22x9.50-12 rear tires. The wheelbase is 49" (1240 mm). The tractor is compatible with the following attachments: a 54" mid-mount 3-blade mower deck with cutting height of 1.0-4.0" (25-102 mm), 13 cut positions, and mechanical lift with assist spring, 46" front blade with lift height of 6.5" (160 mm), and 44" front-mount two-stage snowblower with clearing height of 18" (450 mm).

Engine Troubleshooting
Engine will not start or starts up hard
Fuel tank is empty - Add gasoline
Improper fuel grade - Change gasoline
Air trapped in fuel system - Bleed air
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair
Defective spark plug - Spark plug need to be replaced
Clogged fuel filter - Change fuel filter
Brake pedal not pushed down - Push the brake pedal down
Carburetor is not adjusted - Check carburetor float adjustment
Weak cylinder compression - Inspect cylinder block and change worn parts
Choke cable is unadjusted or damaged - Replace cable or adjust correctly
Engine runs unevenly
Cooling fins are plugged - Need to wash or clean
Ignition system problems - Test ignition and replace failed parts
Defective or stuck throttle cable - Replace or service the cable
Clogged air filter - Change or service air filter
Dirty or damaged fuel pump - Service or change fuel pump
Engine starts and stops suddenly
Spark plug is faulty - Change spark plug as required
Defective or dirty carburetor - Clean or replace carburetor
Faulty ignition coil - Install a new ignition coil
Loose or worn valve springs - Change valve springs
Valves are stuck - Clean the valves
Engine is overheated
Lack of engine oil - Check and refill engine oil
Engine is under excessive load - Load reducing required
Cooling fins are plugged - Wash or clean as required
Too lean carburetor mixture - Make the correct settings
Ignition timing is improper - Set the ignition timing properly
Wrong valve setting - Adjust valves as required
Engine knocking or noise
Low octane fuel - Use proper gasoline
Engine is under excessive load - Reduce engine load
Lack of engine oil - Checking oil level and add if necessary
Wrong adjustment of low idle speed - Correct idle settings
Fuel pump is clogged or faulty - Service or change fuel pump
Worn crankshaft or main bearings - Repair or replace defective parts
Excessive valve clearance - Check and adjust
Worn piston rings or cylinder bore - Replace faulty components
Engine lacks power
Dirty or incorrectly adjusted carburetor - Adjust the carburetor correctly or clean it
Clogged air filter - Clean or replace air filter
Fuel pump is clogged or faulty - Clean or change fuel pump
Ignition system is defective - Check ignition and replace faulty components
Blown cylinder head gasket - Cylinder-head gasket replacement required
Stuck or burned valves - Change or service valves
Worn or bent push rod - Replace push rod
Faulty cylinder block parts - Change defective components
High fuel consumption
Throttle does not open well - Inspect throttle cable and adjust it
Carburetor main jet is improperly adjusted - Adjust it correctly
Spark plug is loose or faulty - Re-tighten or change the spark plug
Worn, stuck, or burned valves - Replace or service valves
Rings, sleeve, or piston are damaged - Replace faulty parts
Excessive valve clearance - Adjust valve clearance
High engine oil consumption
Worn gaskets or seals - Install new components
Valve guides or stems are damaged - Valves must be replaced
Seized or wear piston rings - Have piston rings replaced
Piston or cylinder liner is scored - Check liner and piston, install new components as required
Breather hose or pipe is plugged - Replace or service

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission makes noise
Bent or unadjusted speed control pedal linkage - Change or adjust linkage
Excessive loading - Reduce transmission load
Transmission fluid is dirty or fluid level is too low - Pour fresh fluid or add transmission fluid to proper level
Damaged or worn components of transmission - After disassembly and inspection, replace defective components
Shifting is hard
Shift linkage is corroded or worn - Lubricate or replace linkage
Hydrostatic pump is blocked or defective - Repair or change pump
Transmission shift control parts are damaged or misadjusted - Change or adjust correctly
Power is too low
Lack of transmission oil supply - Fill the transmission housing with oil
Drive sheave is worn or faulty - Change sheave
Not adjusted or damaged shifter linkage - Change or adjust linkage
Speed control linkage is defective or unadjusted - Adjust or install new linkage
Transmission leaking
Broken transmission gaskets or seals - Seals and gaskets need to be replaced
Final drive shaft is leaking - Change shaft seals
Transmission housing is cracked - Replace damage housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates excessively
Mower deck drive pulley is worn or dirty - Service or replace pulley
Loose or damaged drive belt - Belt needs to be adjusted or replaced
Cutting blades are bent or unbalanced - Balance or change blades
Blade bolts are not tightened well - Tighten it fast
Discharge chute keeps clogging
Fast ground speed - Select a lower speed
Tall grass - Adjust mower to lower cutting height
Reduced engine rpm - Adjust throttle to full opening
Cutting height is too low - Change cutting height adjustment
Drive belt installed improperly - Install drive belt as required
Streaking of uncut grass
Clogged mower deck - Clean out the mower deck
Blades are excessively dull - Blades need to be sharpened
Worn or damaged blades - Blades must be changed
Mowing speed is too high - Use a slower speed
Mower cuts too low - Adjust mower to higher cutting height
Filled grass bag - Clean grass bag
Blades are scalping the grass
Lawn is bumpy or not smooth - Lawn leveling required
Cutting level is too low - Adjust mower to higher cutting height
High mowing speed - Use a slower speed
Improperly leveled mower deck - Adjust the level of mower deck correctly
Blades are bent or worn - Install new blades
Tires are not correctly inflated - Inflate tires as required
Mower cutting is uneven
Tires are not properly inflated - Inflate tires as required
Deck is not leveled correctly - Level the deck properly
Blades are too dull - Blades need to be sharpened
Blades are defective or worn - Install new blades
Deck is plugged with grass - Clean out the mower deck
Deck housing is broken - Replace or repair the deck
Mower spindle is loose or defective - Repair or replace the spindle

Electrical Troubleshooting
Battery does not charge
Loose or corroded wire connections - Clean or tighten wiring connections
Faulty battery terminal connectors - Change terminal connectors
Battery bad cell - Replace the battery
Starter turns slowly
Low battery output voltage - Recharge the battery
Battery runs out quickly - Service charging system or replace battery
Disconnected battery cables or bad terminals - Check wiring and clean or replace terminals
Starter will not crank
Battery is drained or worn - Battery needs to be recharged or replaced
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed
Battery power is low - Charge the battery
Incorrectly gapped or worn spark plug - Replace or clean and gap
Faulty solenoid or starter motor - Repair starter or replace solenoid




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