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Husqvarna CTH 151 Troubleshooting
The
Husqvarna CTH 151 lawn tractor was manufactured between 2004 and 2010. The
Husqvarna CTH151 driveline consists of a Kohler Courage SV470 4-cycle
single-cylinder vertical shaft air-cooled gasoline engine and Hydro-Gear
321-0510 belt-driven hydrostatic transmission. A 29.1 cu.in (477 cc) engine
output is 15 hp (11.2 kw) and a maximum torque is 34.3 Nm (25 lb-ft) at 2600
rpm.
The engine has a fixed main jet carburetor, pulse fuel pump, full
pressure lubrication system, and air cleaner with a paper element. Max.
forward speed - 5.5 mph (8.8 km/h), maximum reverse speed - 2.4 mph (3.8
km/h).
The Husqvarna CTH 151 tractor is fitted with 15x6.00-6 front tires and
18x9.50-8 rear tires. The wheelbase is 46.9" (1190 mm). The tractor can
be equipped with 36" or 38" mid-mount 2-blade mower decks with a cutting
height of 1.0-3.5" (25-90 mm).
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Empty fuel tank - Add fuel |
| Wrong fuel grade - Use quality gasoline |
| Air trapped in fuel system - Bleed air |
| Spark plug wiring connection is damaged - Check the spark plug wire connection, repair or replace |
| Faulty spark plug - Install new spark plug |
| Fuel filter is clogged - Install new filter |
| Safety contact for brake pedal defective - Install new part |
| Wrong carburetor adjustment - Adjusting carburetor correctly |
| Bad compression - Check and change damaged parts |
| Throttle cable is worn or adjusted improperly - Replace cable or adjust properly |
| Cooling fins are plugged - Wash or clean as required |
| Ignition failure - Check ignition system and replace faulty parts |
| Faulty or stuck choke cable - Change or service the cable |
| Dirty air filter element - Change or service air filter |
| Fuel pump is clogged or faulty - Clean or change fuel pump |
| Faulty spark plug - Replace spark plug |
| Carburetor is clogged or defective - Replace or service carburetor |
| Ignition coil is faulty - Ignition coil must be replaced |
| Broken or loose valve springs - Valve springs need to be changed |
| Valves sticking - Service the valves |
| Low engine oil level - Fill up the engine oil |
| Engine is running overloaded - Reduce load |
| Cooling fins are clogged - Clean and wash as required |
| Too lean carburetor mixture - Set the carburetor correctly |
| Ignition timing is incorrect - Ignition timing needs to be set properly |
| Incorrect valve setting - Valves needs to be adjusted properly |
| Stale gasoline - Use correct fuel |
| Engine overload - Reduce load |
| Engine oil level is insufficient - Check and refill engine oil |
| Incorrectly set low idle speed - Adjust the low idle speed |
| Dirty or damaged fuel pump - Check fuel pump and change if required |
| Main bearings or crankshaft failure - Replace crankshaft or bearings |
| Improper valve clearance - Adjustment procedure required |
| Piston rings or cylinder bore are worn - Replace faulty parts |
| Engine power is insufficient |
| Carburetor is improperly adjusted or clogged - Clean or correctly adjust carburetor |
| Air filter is blocked - Change or service air filter |
| Dirty or damaged fuel pump - Service or replace fuel pump |
| Ignition system problems - Check ignition and replace faulty components |
| Cylinder head gasket is blown - Install new head gasket |
| Valves are burned or stuck - Change or service valves |
| Bent or worn push rod - Replace push rod |
| Cylinder block components are faulty - Change defective components |
| Throttle is not fully open - Change or adjust throttle cable |
| Improper carburetor main jet adjustment - Adjust main jet as required |
| Spark plug is faulty or loose - Tighten or replace spark plug |
| Stuck, burned, or worn valves - Replace or service valves |
| Sleeve, rings, or piston are damaged - Replace defective components as required |
| Valve clearance is not correct - Adjust valve clearance |
| Excessive engine oil consumption |
| Defective seals or gaskets - New components need to be installed |
| Valve guides or stems are damaged - Valves need to be changed |
| Piston rings are stuck or broken - Replace piston rings |
| Scored cylinder liner or piston - Check liner and piston, replace as required |
| Blocked breather pipe or hose - Change or service |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission is excessively noisy |
| Speed control linkage is defective or unadjusted - Adjust or install new linkage |
| Excessive transmission load - Load needs to be reduced |
| Contaminated transmission fluid or low fluid level - Pour fresh fluid or add transmission fluid to proper level |
| Transmission parts are worm or defective - Replace or repair defective components |
| Damaged or loose shift linkage - Change or repair linkage |
| Worn or seized hydrostatic pump - Replace or repair pump |
| Unadjusted or damaged transmission shift control parts - Change or adjust correctly |
| Lack of transmission fluid - Add fluid to the transmission housing |
| Worn or faulty drive pulley - Replace pulley |
| Faulty or unadjusted shifting linkage - Adjust correctly or change linkage |
| Speed control pedal linkage is bent or not adjusted - Adjust or change linkage |
| Worn transmission seals or gaskets - Replace seals or gaskets |
| Final drive shaft leaks - Install new shaft seals |
| Cracked transmission case - Install a new transmission case |
| Mower Deck Troubleshooting |
| Mower vibration is excessive |
| Drive sheave of mower deck is dirty or worn - Service or change sheave |
| Drive belt is worn or loose - Adjust belt tension or install a new belt |
| Unbalanced or warped mower blades - Balance or change as needed |
| Loose blade mounting bolts - Bolts should be tightened |
| Discharge chute regular clogging |
| Ground speed is too fast - Operate at slower speed |
| Tall grass - Need to set low cutting height |
| Engine is running at too low speed - Adjust choke to full opening |
| Mower cuts too low - Change cutting height adjustment |
| Drive belt installation is not correct - Install drive belt as required |
| Cutting deck clogging - Inspect and clean cutting deck |
| Blades are not sharp - Sharpen the blades |
| Defective or worn blades - Blades must be changed |
| High mowing speed - Use a slower speed |
| Mower deck set to low cutting - Use correct cutting height |
| Bagger is full - Bagger must be empty |
| Blades are scalping the grass |
| Uneven or bumpy lawn - Lawn needs to be leveled |
| Cutting level is too low - Change cutting height adjustment |
| Fast mowing speed - Operate at slower speed |
| Deck level is not correct - Deck should be adjusted correctly |
| Bent or worn blades - Blades must be changed |
| Tires are not properly inflated - Inflate tires correctly |
| Incorrect tire pressure - Inflate tires correctly |
| Improperly leveled mower deck - Deck should be adjusted correctly |
| Blades are excessively dull - Sharpen the blades |
| Worn or bent blades - Replace the blades |
| Deck clogged with grass clippings - Need to clean the mower deck |
| Broken mower deck housing - Rebuild or replace mower deck |
| Mower spindle is loose or defective - Spindle needs to be repaired or replaced |
| Electrical Troubleshooting |
| Battery will not charge |
| Loose or corroded wire connections - Tighten or clean connections |
| Battery terminal connectors are faulty - Install new terminal connectors |
| Battery faulty cell - Use a new battery |
| Low battery power - Battery is drained, recharge it |
| Battery runs out quickly - Battery needs to be serviced or replaced |
| Disconnected cables or faulty battery terminals - Connect wires properly or change terminals |
| Battery is low or faulty - Charge or change the battery |
| Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required |
| Battery power is low - Battery is drained, charge it |
| Improperly gapped or dirty spark plug - Replace or clean and gap |
| Starter motor or solenoid failing - Starter/solenoid needs to be replaced |
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| Lawn and Garden Tractors Technical Specs |
