By Lucy FitzgeraldUpdated November 2026
When a hart lawn mower won’t start, the fix is often a single worn or failed part rather than a full repair. This guide compares five parts that owners commonly replace when a Hart mower refuses to crank, including a start key, a starter solenoid, an electric starter, and a recoil starter assembly. Because the right part depends on your mower’s power source and starting system, each pick below is matched to a specific need. Read the comparison first, then check the buying guide to confirm the part fits your machine before you order.
Our top picks at a glance
- 1
TOP CHOICEBest overallKohler 7000 Series Starter (SV/KT series)View on Amazon - 2
TOP CHOICEBest for electric-start mowers with a key switchFuse Key 311280001 Start KeyView on Amazon - 3
TOP CHOICEBest for riding mowers with a clicking no-start192507 Starter SolenoidView on Amazon - 4
Best for a Kohler-engine replacement starter with a Cub Cadet referenceKohler 7000 Series Starter (Cub Cadet reference)View on Amazon - 5
Best budget pick for pull-start mowers593959 Recoil StarterView on Amazon
Selection criteria: each product was chosen for how directly it addresses a common no-start cause, how clearly its listing identifies the engine or mower it fits, and how closely its design matches the component failures owners most often describe. This is a research-based selection drawn from specifications and general owner feedback patterns. It is not based on hands-on testing.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Kohler 7000 Series Starter (KT/SV series) | Kohler-powered riding mowers | 12V starter for 20–27 HP engines |
| Fuse Key 311280001 Start Key | Battery-powered mowers with a key start | Replaces a lost or worn start key |
| 192507 Starter Solenoid | Riding mowers with a click but no crank | Solenoid for multiple brands |
| Kohler 7000 Series Starter (Cub Cadet reference) | Cub Cadet-cross-referenced Kohler engines | Cross-referenced part number list |
| 593959 Recoil Starter | Pull-start Troy Bilt and Briggs & Stratton engines | Complete pull-start assembly |
Kohler 7000 Series Starter (SV/KT series)
Kohler Starter 7000 Series Mowers for KT715 KT725 KT730 KT735 KT740 KT745 Courage Twin SV710 SV715 SV720 SV730 SV735 SV740 SV810 SV820 SV830 SV840 3209801 3209803 3209804 3209808 12V 20-27 HP
Best for: Riding mowers and tractors with a Kohler 20–27 HP engine that cranks slowly or not at all.
This is a best fit for owners who have already confirmed the engine is a Kohler 7000 series and the starter is the failing component. A slow crank, a grinding noise, or silence when the key is turned often points to a worn starter motor, and this part is designed to replace it directly.
Key specs
- 12V starter motor
- Fits 20–27 HP Kohler 7000 series engines
- Listing covers multiple KT and SV model numbers
Pros
- Wide model coverage across the KT and SV series
- Direct replacement for a worn starter motor
- Part numbers in the listing make cross-checking easy
Cons
- Fitment depends on exact engine model; a mismatch wastes time
- Installation requires disconnecting the battery and some basic tools
Bottom line: Pick this if your mower is a Kohler 7000 series riding mower and the starter motor is the likely failure point.
Fuse Key 311280001 Start Key
Lawn mower fuse key, Fuse Key 311280001 Start Key for Ryobi 40V Lawn Mower P1100,RY40104,RY40108
Best for: Battery-powered mowers that use a removable key to start and have a key that is lost, worn, or no longer engages the switch.
If your mower has a key-start system and nothing happens when you turn the key, the key itself or its contacts may be the problem. Owners often find that a worn key fails to close the switch even though the battery is charged.
Key specs
- Replacement start key style part
- Listing references compatibility with several Ryobi 40V mower models
Pros
- Low-cost way to test whether the key is the issue
- Simple installation with no tools in most cases
- Clear model references in the listing
Cons
- Only useful if the key or its switch is the failure point
- Must match the exact key shape for your model
Bottom line: A sensible first purchase for key-start owners who suspect the key is the problem rather than the motor.
192507 Starter Solenoid
192507 Starter Solenoid for Husqvarna Poulan 532192507 582042802 582042801 Craftsman LT2000 YS4500 YT3000 Trombetta 862-1241-211-12 Ariens 21546294 Riding Lawn Mower Tractor
Best for: Riding mowers that make a single click when the key is turned but do not crank the engine.
A single click usually means the solenoid is engaging but power is not reaching the starter, or the solenoid contacts are worn. This part covers several brands, which makes it useful for owners who want a common replacement.
Key specs
- Starter solenoid for riding mower and tractor applications
- Listing includes multiple cross-reference numbers
Pros
- Cross-reference list covers several brands
- Targets a common no-crank failure
- Easy to compare against the old solenoid
Cons
- Not the answer if there is no click at all
- Requires testing the battery and wiring first to confirm the diagnosis
Bottom line: Best for owners who hear a click and want to replace the most likely culprit before buying a starter motor.
Kohler 7000 Series Starter (Cub Cadet reference)
Kohler 7000 Series Starter for KT715 KT725 KT730 KT735 KT740 KT745 Courage Twin SV710 SV715 SV720 SV730 SV735 SV740 SV810 820 830 840 20HP-27HP 3209801 3209803 3209804 3209808 Cub Cadet 1999-1140051
Best for: Owners who need a Kohler 7000 series starter and want a part that cross-references a Cub Cadet number.
This listing is useful when your mower’s original part number is a Cub Cadet reference rather than a Kohler number. Matching the cross-reference is the key step before you buy.
Key specs
- Kohler 7000 series starter for 20–27 HP engines
- Includes a Cub Cadet cross-reference number
Pros
- Useful cross-reference for Cub Cadet owners
- Covers a range of KT and SV models
- Direct replacement for a failed starter motor
Cons
- Fitment must be checked carefully against your engine model
- Some owners may find the listing crowded with model numbers
Bottom line: A good choice for Cub Cadet-equipped Kohler engines where the cross-reference number is the deciding factor.
593959 Recoil Starter
593959 591139 Recoil Starter for Troy Bilt TB110 TB200 140CC 150CC Lawn Mower Brigs Straton 450E 550EX 08P502 093J02 09P602 09P702 Engines 593959 Pull Start Assembly
Best for: Pull-start mowers with Briggs & Stratton or compatible engines where the rope will not retract or the handle no longer engages.
If your mower uses a pull cord instead of an electric starter, the recoil assembly is a common failure point. A broken rope, a spring that will not rewind, or a pawl that does not engage can all prevent starting.
Key specs
- Complete pull-start assembly
- Listing references Briggs & Stratton engine models and several cross-reference numbers
Pros
- Complete assembly, so no separate parts hunting
- Budget-friendly way to fix a pull-start failure
- Clear engine references in the listing
Cons
- Only relevant for pull-start mowers
- Installation requires removing the old assembly and some care with the spring
Bottom line: A practical pick for pull-start owners who want a complete recoil replacement without a major rebuild.
Buying Guide
Identify your starting system first
Before you buy any part, confirm how your Hart mower starts. Electric-start riding mowers use a battery, starter motor, and solenoid. Battery-powered walk-behind models often use a key or switch. Pull-start models rely on a recoil assembly. Buying the wrong category wastes money and time.
Good picks for this: Kohler 7000 Series Starter (SV/KT series), 593959 Recoil Starter
Check the engine model and part numbers
Locate the engine model number on the blower housing or the engine shroud, and find the mower’s model and serial plate. Compare these to the cross-reference numbers in each listing. Mismatched engines are a common source of returns.
Good picks for this: Kohler 7000 Series Starter (Cub Cadet reference), Kohler 7000 Series Starter (SV/KT series)
Diagnose the symptom before buying
A single click points toward the solenoid or battery connections. No sound at all can mean a dead battery, a bad key switch, or a broken wire. A slow crank often indicates a weak battery or a worn starter motor. Test the battery voltage with a multimeter and check the terminals for corrosion before replacing any part.
Good picks for this: 192507 Starter Solenoid, Fuse Key 311280001 Start Key
Match the voltage and power rating
Starter motors are rated by voltage and by the engine size they serve. The Kohler 7000 series listings reference a 12V system and a 20–27 HP range. Using a starter outside its intended range can lead to poor engagement or premature failure.
Good picks for this: Kohler 7000 Series Starter (SV/KT series), Kohler 7000 Series Starter (Cub Cadet reference)
Consider the use case
A mower that starts every time on a small lawn has different needs than one used daily on a larger property. If you run your mower hard, a complete starter or recoil assembly may last longer than a repaired component. Occasional users may only need a low-cost key or solenoid.
Good picks for this: 593959 Recoil Starter, Fuse Key 311280001 Start Key
Look at build quality and durability
Starters and solenoids are exposed to heat, vibration, and moisture. Owners often report that parts with sealed connections and solid mounting hardware hold up better in outdoor conditions. Check whether the listing describes the materials or the replacement scope clearly.
Good picks for this: Kohler 7000 Series Starter (SV/KT series), 192507 Starter Solenoid
Plan for installation and maintenance
Most replacements require disconnecting the battery, removing the old part, and reconnecting the wiring in the correct order. Keep the battery terminals clean and tight, and inspect the cables at each service interval. If you are not comfortable working with electrical connections, consider a small-engine shop.
Good picks for this: Kohler 7000 Series Starter (Cub Cadet reference), 593959 Recoil Starter
FAQ
Why does my Hart lawn mower click but not start?
A click usually means the solenoid is receiving the signal but the starter is not getting enough current. Check the battery charge, clean the terminals, and test the solenoid connections. If those are sound, the solenoid or starter motor is the likely failure point.
How do I know if the key or the starter is the problem?
If the key turns but nothing happens, check the battery first. If the battery is charged and the key still fails to engage the switch, the key or its switch may be worn. A slow or grinding crank points more toward the starter motor.
Can I replace a starter myself?
Many owners replace starters at home with basic hand tools. Disconnect the battery first, label the wires, and follow the manufacturer’s torque specifications. If you are unsure about the electrical connections, a small-engine repair shop can handle the job.
What causes a recoil starter to stop working?
Common causes include a broken rope, a weak or broken return spring, and a pawl that does not engage the flywheel. Inspect the rope and spring first. Replacing the complete recoil assembly is often simpler than repairing individual parts.
Does a weak battery cause a no-start condition?
Yes. A low battery can cause a slow crank, a click, or no response at all. Charge the battery fully and test its voltage before replacing starter components, since many no-start problems trace back to the battery.
How do I find the right part number for my mower?
Start with the engine model number and the mower’s model and serial plate. Compare these to the cross-reference numbers in each listing. If the numbers do not match, do not assume the part fits.
Conclusion
A hart lawn mower won’t start for many reasons, but the most common fixes involve the starter system, the solenoid, the key, or the recoil assembly. For Kohler-powered riding mowers with a failed starter motor, the Kohler 7000 Series Starter is the most direct option. Owners who hear a single click should check the solenoid, while key-start owners with a worn key should consider the Fuse Key 311280001. Pull-start owners will find the 593959 Recoil Starter the most practical complete replacement. Confirm the engine model and part numbers before you buy, and test the battery and wiring first to avoid replacing the wrong component.
Sources
- Consumer safety guidance on operating and maintaining outdoor power equipment, including battery and electrical safety (cpsc.gov)
- Information on battery care, charging, and storage that can help diagnose low-voltage starting problems (energy.gov)
- Workplace safety guidance on working with electrical equipment and lockout procedures during repairs (osha.gov)
Related reading
- Hart Brushless Lawn Mower Won't Start: Causes and Step-by-Step Fixes
- Hart 40V Lawn Mower Won't Start: 8 Fixes to Try First
- Yardman Lawn Mower Won't Start: 8 Causes and Fixes (2026)
- Yard Machines Lawn Mower Won't Start: 7 Causes and Fixes
- Why Won't My Toro Lawn Mower Start? 8 Causes and Fixes
- Troy Bilt Lawn Mower Won't Start TB110: 8 Causes and Fixes
About Lucy Fitzgerald
Lucy researches and writes buying guides and how-to articles on lawn mowers. Picks are based on product specifications, brand reputation and patterns in owner feedback, and are updated as new models come out.
