CRAFTSMAN 247.374320 Service Manual

Overview

The CRAFTSMAN 247.374320 service manual provides a comprehensive guide to the maintenance, adjustment, and repair of this outdoor power equipment model. It outlines the intended use, safety considerations, and basic operational principles to help technicians diagnose issues efficiently. The document emphasizes proper procedures for disassembly and reassembly, as well as the correct sequence of steps to avoid damage to critical components. It also covers the recommended inspection intervals and common fault conditions that may arise during routine operation or after extended use. A solid understanding of the machine’s hydraulic, electrical, and mechanical subsystems is essential for achieving reliable performance and extending the equipment’s service life.

The manual serves as a practical reference for professional technicians, home workshop enthusiasts, and service centers tasked with maintaining and repairing the CRAFTSMAN 247.374320. It includes cautions about potential hazards, appropriate safety gear, and the necessary environmental conditions for service work. By detailing typical symptoms, diagnostic approaches, and repair procedures, the manual helps ensure that repairs are performed correctly and in a timely manner. It also provides guidance on selecting compatible replacement parts and verifying that all systems operate within specification after any service action. The scope is designed to support a range of users, from those performing routine maintenance to those conducting more complex overhauls.

The document identifies the target audience as professional technicians, service technicians at authorized centers, and experienced DIYers who possess a moderate to advanced understanding of outdoor power equipment. It emphasizes adherence to manufacturer specifications and torque values, as well as the proper use of service tools and jigs. The included tools list highlights essential items for safe and effective maintenance, such as torque wrenches, pullers, feeler gauges, and specialized alignment aids. It also notes the importance of using compatible replacement parts to maintain warranty coverage and optimize performance. Overall, the manual aims to equip readers with the knowledge to diagnose issues accurately and perform repairs that restore reliability and efficiency to the machine.

Safety and compliance

Personal protective equipment (PPE) requirements for servicing the CRAFTSMAN 247.374320 are essential to protect technicians from exposure to moving parts, sharp edges, and potential electrical hazards. Operators should wear ANSI-rated safety glasses with side shields to shield the eyes from flying debris, along with cut-resistant gloves when handling blades, belts, or other sharp components. In environments where noise levels are elevated, hearing protection such as earmuffs or earplugs should be used. Steel-toe boots or other protective footwear are recommended to safeguard feet from dropped tools or heavy components. Depending on the task, a long-sleeved, flame-resistant outer layer may be appropriate when dealing with heat-generating parts or when using solvents. Hygiene practices, including removing jewelry and tying back long hair, help prevent entanglement with moving parts or hot surfaces. Ensure PPE is in good condition, properly fitted, and inspected before each service operation to maintain optimal protection. When PPE cannot be used due to task constraints, reassess the procedure or use alternative tools designed to minimize exposure to hazards.

Lockout tagout procedures and electrical safety are critical for preventing accidental energization of the mower’s electrical system during maintenance. Begin by disconnecting the spark plug wire to ensure the engine cannot start unexpectedly, and remove the battery if the unit is battery-powered to eliminate stored energy. Apply a written lockout tag that clearly identifies the technician and the maintenance activity, and verify that all energy sources are isolated before work commences. A multimeter or equivalent voltage tester should be used to confirm the absence of voltage on exposed circuits, and any capacitors with residual charge should be safely discharged according to the manufacturer’s guidelines. Maintain a clean work area with tools organized and within reach to reduce the risk of accidental contact with live components. Follow proper procedural order for all tasks, including de-energization steps, testing, and re-energization, to ensure a controlled return to service. When lockout tagout devices are applied, never bypass or defeat them, and remove tags only after the maintenance is complete and all safety checks have been performed. Document all lockout activities in the service log to ensure traceability and compliance with safety standards.

Electrical safety extends beyond lockout procedures to include correct handling of fuel systems and electrical connectors. Work should be performed in a well-ventilated area to prevent fuel vapor accumulation, with fuel sources isolated and refueling postponed until after maintenance tasks that may introduce sparks. Replace any damaged wiring or insulation with OEM components and use insulated tools when working near exposed conductors. When servicing capacitive or high-voltage elements, keep a safe distance from exposed conductors and use appropriate insulating barriers or shields. Adhere to the manufacturer’s torque specifications for fasteners to prevent overstressing electrical housings or mounts, which could create arcing or overheating conditions. Regularly inspect safety labels and interlocks to confirm they function correctly, and replace any worn or illegible decals to maintain clear safety guidance for future users. Finally, ensure that all personnel involved in maintenance have received up-to-date training on electrical hazards and lockout procedures to promote a culture of continuous safety compliance.

Product overview

The CRAFTSMAN 247.374320 is a compact, multi-functional outdoor power tool designed to deliver reliable performance for lawn and garden maintenance. It integrates essential components that work together to provide efficient cutting, trimming, and edging capabilities in a single, versatile machine. The unit is built with user-friendly controls and accessible service interfaces to facilitate routine maintenance and field repairs. Its design emphasizes durability, ease of use, and compatibility with common cutting accessories, making it suitable for both casual homeowners and more demanding seasonal users. Overall, the 247.374320 aims to balance power, maneuverability, and longevity in a compact package that fits typical residential yard layouts.

Model 247 374320 specifications

The 247 374320 model adheres to precise electrical and mechanical specifications to ensure predictable performance. Engine specifications, including displacement, horsepower, and idle characteristics, determine the available cutting power and responsiveness under load. The cutting width and height adjustment ranges define the tool’s versatility for different grass lengths and terrain conditions. Weight, balance, and center of gravity influence operator fatigue and control during extended use. Fuel compatibility, lubrication intervals, and maintenance torque values are critical for sustaining reliability and preventing premature wear. Electrical requirements, safety interlocks, and starting procedures are outlined to help technicians troubleshoot issues without compromising operator safety. These specifications provide the baseline for assessing performance, compatibility with replacement parts, and scheduling preventive maintenance tasks.

In addition to the core specifications, operational metrics such as maximum engine RPM, blade or trimmer head speeds, and transmission or drive engagement details determine the effective productivity of the machine. The 247 374320 is designed to meet typical environmental and safety standards for consumer outdoor power equipment, including emissions considerations and noise level targets. Storage conditions, including temperature and humidity ranges, are specified to preserve components during off-season downtime. The model's warranty scope and service intervals align with manufacturer guidelines to support authorized repairs and legitimate maintenance procedures. Understanding these specifications helps technicians accurately diagnose performance deviations and recommend appropriate corrective actions.

Key components and their functions

The key components of the CRAFTSMAN 247.374320 include the power source, cutting assembly, and control system, each performing a vital role in overall operation. The power unit delivers the necessary torque and speed to the cutting mechanism, with built-in safety features such as kill switches and ignition interlocks to prevent accidental starting. The cutting assembly can vary between mowing blades, trimmer lines, or edging attachments, but all share common wear points like blade clamps, spindles, and gear housings that require regular inspection. The control system encompasses throttle, choke, and safety interlocks that regulate engine speed and engagement, enabling smooth transitions between idle, cutting, and shutdown modes. Maintenance of these components involves checking for wear, lubrication of moving parts, and timely replacement of consumables to maintain peak performance. Understanding how each part contributes to function helps identify faults quickly and implement effective repairs.

Another critical group of components includes the cooling system (if applicable), air intake, and exhaust paths, which manage engine temperature and emissions while maintaining efficiency. The drive and transmission mechanisms, where present, translate engine power to the cutting undercarriage, with belts, pulleys, and tensioners that require periodic alignment and tension checks. The safety assembly, including guards, shields, and operator presence sensors, protects users from moving parts and reduces the risk of injury during operation. Fasteners, brackets, and mounting points must be inspected for loosening and corrosion, as compromised hardware can cause vibration, misalignment, or failure during use. Regular maintenance routines focusing on lubrication, torque checks, and part replacements keep the machine performing reliably across demanding yard tasks.

Finally, the electrical and sensing subsystems monitor and control starting, fuel management, and safety interlocks, ensuring responsive and predictable behavior. Wiring harness integrity, connector security, and insulation condition are verified during diagnostics to prevent intermittent faults. Sensor data, when present, may be used to optimize performance or provide fault codes for quick troubleshooting. By detailing the function and upkeep of these key components, technicians can develop a structured maintenance plan that minimizes downtime and extends the service life of the CRAFTSMAN 247.374320. Regular inspection, cleaning, and replacement of worn parts are essential practices for preserving performance and safety in a tool designed for yard equipment daily use.

The CRAFTSMAN 247.374320 requires a structured maintenance routine to ensure reliable performance and longevity. Regular attention to lubrication, filtration, and fastener integrity will help prevent unexpected downtime and costly repairs. Start by performing a thorough visual inspection before each use, looking for cracked hoses, loose bolts, or signs of wear on belts and pulleys. Establish a routine that includes checking fluid levels, lubricating moving parts, and cleaning debris from air intakes and cooling surfaces. A disciplined maintenance approach minimizes the risk of degraded performance and extends the equipment’s service life.

Regular maintenance should align with the operating conditions and duty cycle of the unit. For typical residential use, a monthly check of critical systems is advisable, while heavy usage or high-load environments may require biweekly inspections. Pay particular attention to the fuel system, spark plug condition, and air filter integrity, as these are common failure points that can affect starting and efficiency. Record all observations and actions in a maintenance log to track wear patterns and anticipate components that may require replacement. Consistent documentation also facilitates troubleshooting and ensures that service intervals are not overlooked during busy seasons.

Lubrication is essential for smooth operation and reduced wear. Use manufacturer-approved lubricants for pivot points, linkages, and drive shafts, applying the recommended quantities and intervals found in the service data. Avoid contaminating oil with dirt or moisture, which can accelerate component wear. Regularly inspect the condition of lubricants and replace or refresh as necessary to maintain optimal film strength and cooling performance. Proper lubrication also helps preserve seals and gaskets, reducing the likelihood of leaks and associated performance issues.

Fluid and fuel systems demand particular attention to quality and cleanliness. Use fresh fuel and appropriate stabilizers if the machine will store for extended periods. Replace fuel filters on the schedule specified by the manual and inspect fuel lines for cracks or stiffness. Air entering the engine is vital for efficient combustion, so the air filter should be cleaned or replaced at the recommended intervals. A clean intake path reduces engine load and improves performance, especially under heavy cutting or mowing conditions. Ensure that fender and cooling shrouds remain unobstructed to promote adequate airflow and engine cooling during operation.

Electrical and ignition systems should be checked for proper function to prevent misfires and unreliable starts. Inspect the spark plug(s) for wear, proper gap, and cleanliness, replacing as needed. Examine wiring harnesses for signs of abrasion, heat damage, or loose connections, and secure any loose fittings. Battery health, charging system performance, and safety interlocks must be verified periodically to maintain safe operation. When diagnosing symptoms, start with the simplest potential causes, such as air leaks, then progress to more complex electrical faults, ensuring all safety procedures are observed during testing.

Common service intervals and symptoms provide a practical framework for proactive maintenance. If you notice decreased cutting efficiency, excess vibration, or unusual noises, perform a focused inspection of blades, spindle assemblies, and drive belts, as these are frequent sources of performance drops. Clutch and belt wear can manifest as slipping or delayed engagement, while overheating may indicate restricted airflow or degraded cooling components. Worn or damaged blades should be replaced promptly to prevent further equipment strain and to maintain cut quality. By correlating symptoms with service intervals, you can tailor your maintenance schedule to the machine’s actual usage pattern and extend its operational life.

Disassembly and inspection

Safe removal of external covers begins with ensuring the power source is disconnected and the equipment is on a firm, level surface. Remove any detachable accessories or attachments that could interfere with cover removal, and place fasteners in a labeled container to prevent loss. Use the appropriate hand tools and avoid excessive force; if a cover is stubborn, confirm that all mounting screws, clips, or bolts have been fully released before attempting to separate the parts. Keep track of gasket material and seals, inspecting them for damage as you remove each cover. Document the order of removal to ease reassembly and minimize the risk of misalignment during later steps.

When performing inspection of transmission and drive belts, start by visually examining the belt surfaces for cracks, fraying, glazing, or missing teeth. Check belt tension by following the manufacturer’s specified procedure, ensuring the belt maintains proper tension without excessive slack. Rotate pulleys manually to detect any binding, unusual noises, or misalignment that could indicate bearing wear or a warped component. Inspect the pulley rims for wear, burrs, or grooves that could affect belt seating and tracking. If any belt or pulley shows significant wear, replace components using OEM parts to preserve drive reliability and safety during operation.

During disassembly, take care to document the positioning of shifting mechanisms, linkages, and fasteners to facilitate accurate reassembly. Use tear-away or labeled bags for small parts and take photos at key milestones to aid reference. When removing transmission components, support them to prevent unintended movement and to protect internal gears and bearings from contamination. After exposure, clean surrounding areas with a lint-free rag and approved solvent, avoiding contact with seals or exposed bearings. Before reassembly, inspect internal gear trains, bearings, and seals for wear or damage, replacing any compromised parts to maintain performance and longevity of the transmission system.

Inspect the integrity of protective shields and housings as you progress, ensuring mounting points are undamaged and able to withstand operational stresses. If you notice cracks, deformation, or loose mounts, address these issues before continuing, as compromised covers can alter cooling and debris management. Confirm that all internal components have remained free from debris and foreign material during disassembly; use compressed air or a clean brush to clear passages, taking care not to disturb delicate components. Reassemble in the reverse order of disassembly, torquing fasteners to the manufacturer’s specifications and verifying that belts, pulleys, and guards are properly aligned for safe startup and reliable performance.

Document Title: CRAFTSMAN 247.374320 Service Manual

Repair procedures

Electrical system troubleshooting A thorough electrical system inspection begins with a careful visual check of all wiring harnesses, connectors, and terminals for signs of wear, corrosion, or damage. Begin by disconnecting the battery and inspecting the battery terminals for clean, tight connections, removing any corrosion with a non-metallic brush and a baking soda solution if necessary. Use a digital multimeter to verify the presence of proper voltage at the battery, solenoids, and the starter circuit, ensuring there are no unexpected voltage drops under load. When diagnosing switches and relays, test continuity and resistance values against the manufacturer’s specifications, while noting any intermittent faults that may only appear under vibration or temperature changes. Document all findings, including measured values and observed symptoms, to guide part replacement and reassembly, and recheck the system after any repairs to confirm that normal operation has been restored. Electrical noise or improper grounding can lead to misleading readings; ensure that the engine-to-frame ground strap is intact and that protective measures, such as fuses and circuit breakers, are properly sized and seated. After repair, perform a controlled test under a range of operating conditions to validate that cranking, starting, charging, and electrical accessories function reliably without intermittent faults. Fuel system inspection and carburetor care Begin the fuel system inspection with a visual examination of the fuel lines for cracks, kinks, or leaks, and replace any damaged hoses using the correct size and type specified by the service data. Check the fuel filter or inline filters for clogging or restriction, replacing them if any debris is observed or if fuel flow is restricted when tested with a graduated container. Inspect the fuel tank, cap venting, and fuel pickup for obstructions, ensuring that venting is unobstructed to prevent vapor lock and poor fuel delivery. When inspecting the carburetor, remove and disassemble only as far as necessary to observe the condition of the jets, needle, seat, and gaskets; clean all passages with clean, non-resinized carburetor cleaner and compressed air, taking care not to damage delicate passages or orifices. Reassemble using the manufacturer’s torque specifications and verify that the float height and needle seating are set correctly; adjust the idle and mixture screws only within the ranges recommended by the service data. After reassembly, prime the fuel system in a controlled manner and perform a bench test to confirm no leaks and proper fuel flow before reinstalling the unit onto the engine. Finally, perform a functional run to observe smooth idle, reliable acceleration, and consistent fuel economy, noting any symptoms such as hesitation, surging, or stalling that would indicate remaining calibration or sealing issues.

Note: All procedures should be performed with the appropriate safety equipment and in accordance with the manufacturer’s guidelines. Always consult the latest service data for torque values, part numbers, and specific testing procedures related to the Craftsman 247.374320 model to ensure accuracy and safety during repair operations. When in doubt, replace worn components rather than attempting borderline repairs, and maintain a clean, organized work area to prevent foreign debris from entering fuel or electrical systems.

Alignment and calibration

The alignment and calibration of the mower’s deck and engine timing are critical to achieving optimal cutting performance, even blade wear, and efficient engine operation. Begin with a thorough inspection of the mower deck mounting points, ensuring that all mounting hardware is secure and free of play. Any looseness can translate into uneven cutting heights and increased vibration, which, over time, can degrade spindle bearings and belt life. Before performing adjustments, surface clean the deck and surrounding components to provide clear reference points and accurate measurements. Use the manufacturer’s reference marks as a baseline, and verify that the chassis and deck are level with the ground to establish a true starting condition for subsequent steps.

The process of deck leveling involves checking and adjusting the front and rear spindle heights to achieve a uniform cutting plane across the entire width of the deck. Start by parking the mower on a flat, solid surface and engaging the parking brake. Lower the deck to its lowest position and measure the distance from the ground to each blade tip or to the underside of the deck at multiple points along the edges. Compare these measurements to the recommended reference values in the service manual, then adjust the deck lift linkages or suspension blocks as required. After making adjustments, recheck all measurements to confirm the deck sits square and parallel to the ground. Finally, test the mower by performing a light-cut pass over a smooth section of turf to observe cut uniformity and listen for any unusual vibrations or rubbing sounds that would indicate misalignment.

Engine timing and tension adjustments are essential for reliable starting, smooth idle, and proper power delivery. Begin by disconnecting the spark plug wire and removing any protective covers to access the timing components, such as the camshaft, timing belt, or chain, depending on the model configuration. Inspect the timing marks on the crankshaft pulley or flywheel and align them to the designated reference points as specified in the service data. If timing is off, carefully loosen the tensioner or adjust the camshaft drive gear as directed, then rotate the crankshaft through a full cycle to verify that all timing marks realign correctly within the specified tolerances. After achieving correct timing, reassemble any covers and recheck tension on the drive belt or chain to ensure it maintains the correct tension range under typical operating loads.

With timing verified, perform a functional test of the engine under light load conditions to ensure it starts reliably and runs smoothly across a range of speeds. Pay attention to idle stability, throttle response, and any signs of belt slip or misalignment that could indicate residual tension issues. If the mower exhibits any hesitation, misfire, or abrupt throttle transitions, recheck the ignition timing and tension in small, incremental steps, following the service data precisely. Document all measurements and adjustments for future maintenance so that the deck alignment and engine timing remain within factory specifications during routine service intervals. A systematic approach to alignment and calibration helps extend component life and sustains predictable mowing performance season after season.

Part number referencing and compatibility: When maintaining or repairing equipment, it is essential to verify that replacement parts and consumables match the exact specifications of the unit. For the CRAFTSMAN 247.374320, begin by locating the model and serial numbers on the chassis plate, then consult the official parts list to identify the corresponding part numbers for every component you intend to replace. Keep a running record of the part numbers and current revision levels, as these details can change between production runs or with seasonal updates. Before ordering, cross-check the listed compatibility notes to ensure the parts will fit your specific configuration, including any optional accessories or attachments installed at the factory or by a prior owner. When uncertain, contact an authorized service center or the manufacturer’s parts department with your machine’s identifiers to confirm compatibility. This practice helps prevent incorrect parts from being installed, which can lead to downtime, accelerated wear, or potential safety hazards during operation.

Recommended lubricants and filters: Selecting the correct lubricants and filtration components is crucial for long-term reliability and optimal performance of the power equipment. Use only lubricants that meet the manufacturer’s viscosity and additive specification for the CRAFTSMAN 247.374320, and avoid substituting generic products that may not provide the same protection or may degrade seals and gaskets. For engine-based sections of the unit, ensure the oil grade, capacity, and change intervals align with the service manual recommendations, and replace the oil filter at the manufacturer’s specified service intervals to maintain clean oil flow. In fuel-integrated systems, use the recommended fuel stabilizers and filters to prevent varnish formation and injector clogging, particularly if the unit will be stored for extended periods. For air and vacuum systems, select filters with the correct micron rating and ensure a tight seal to prevent unfiltered air from bypassing the filtration media. Regularly inspecting, cleaning, or replacing consumables according to the prescribed intervals will help sustain performance and reduce the risk of unexpected failures during critical operations. Always document the date, part number, and service outcome after performing any replacement or lubrication work to support future maintenance planning and warranty compliance.

Testing and quality checks

Operational performance tests begin after all mechanical work is complete and the fuel system is reconnected. Start by performing a visual inspection to verify that there are no loose fasteners, damaged lines, or debris in the drive system. Check belt alignment, tension, and any pulleys for wear, ensuring that all components rotate freely without obstruction. With the spark plug, air filter, and fuel system components reinstalled, start the engine in a well-ventilated area and listen for abnormal sounds such as knocking, grinding, or consistent misfiring. Observe exhaust color and smoothness of operation at idle and under light load before advancing to higher RPM tests. Document all observed anomalies so they can be traced back to specific subsystems during troubleshooting.

When conducting load and performance tests, verify the unit develops rated power without excessive vibration or overheating. Place the equipment under normal operating conditions, including appropriate blade engagement and load scenarios that reflect typical user applications. Monitor temperature readings at the engine and muffler areas, noting any rapid increases that could indicate cooling system issues. Assess throttle response, cutting performance, and transmission behavior if applicable, ensuring there is no lag or hesitation. During these tests, use calibrated gauges for fuel pressure and compression if available, and compare readings to the manufacturer’s specifications. Record results and adjust only within prescribed tolerances to avoid compromising safety or reliability.

Post service safety verification involves confirming that all safety interlocks, guards, and shields function correctly. Manually test operator presence controls, kill switches, and blade brake mechanisms to ensure immediate and reliable shutdown. Inspect wiring harnesses for chafing, proper routing, and secure connections, replacing any damaged insulation or connectors. Verify that safety decals remain legible and that starting procedures comply with the recommended sequence. Finally, perform a functional check of the emergency shutoff or kill switch in both run and stall conditions, and re-test all safety features after any adjustment. Comprehensive documentation of safety verifications should accompany the service report to assist future maintenance and user safety.