CRAFTSMAN 917.298351 Service Manual

The purpose and scope of this manual are to provide clear, practical guidance for the maintenance, repair, and safe operation of the CRAFTSMAN 917.298351 lawn mower. This document targets professional technicians and competent hobbyists who perform routine maintenance, troubleshooting, and component replacement on this specific model. It covers essential disassembly and reassembly procedures, lubrication schedules, fuel system care, electrical checks, and safety-related adjustments to ensure reliable and safe performance. Adhering to the procedures herein helps extend the life of the equipment, optimize cutting performance, and reduce the likelihood of unexpected downtime in the field or at home.

Prioritizing safety is a fundamental component of every task described in this manual. Before beginning any maintenance or repair, verify that the engine is off, the spark plug is disconnected, and the battery is isolated if applicable. Always work on a level, stable surface with the ignition key removed or the power shutoff in place. Use the proper personal protective equipment, including safety glasses, gloves, and hearing protection where required. Ensure that fuel, oil, and cooling fluids are handled in accordance with local regulations, and never perform service under the influence of alcohol or medications that could impair judgment or coordination. Maintain a clean work area to prevent slips and to avoid contaminating components with dirt or debris.

Symbols and terminology used in this manual are standardized to communicate warnings, cautions, and procedural steps clearly. A warning symbol indicates an imminent hazard that could result in serious injury or damage if not avoided. A caution symbol highlights actions that may cause equipment damage or degraded performance if not followed precisely. Technical abbreviations and nomenclature reflect common OEM terms and measurements, such as PTO, speed ratings, and fuel mixture guidelines, to ensure accurate interpretation of torque values, lubrication points, and replacement part numbers. When referencing components, the terminology corresponds to the assembly diagrams included in the companion figures, which serve as visual aids to reinforce proper orientation and fastener selection. If a term is unfamiliar, consult the glossary found at the end of the manual for concise definitions relevant to the 917.298351 model.

Tools and Equipment Required

To perform proper maintenance and repair on the CRAFTSMAN 917.298351, assemble a comprehensive set of specialized tools, common hand tools, and precision measuring devices. Begin with a quality set of metric and SAE socket wrenches, including deep sockets for recessed fasteners, and a full assortment of hex keys to accommodate different fastener heads encountered in the mower and power equipment components. A ratchet with a comfortable grip, along with extensions and Universal Joints, will help access hard-to-reach bolts underneath the frame and deck. Maintain a digital multimeter capable of measuring voltage, current, and resistance for electrical system diagnostics, and include a diagnostic scan tool or OEM-compatible interface if available to read error codes from any controller modules. A torque wrench with a suitable range is essential to ensure fasteners are tightened to spec without over-stressing components.

Maintenance supplies should cover both routine and preventive tasks. Stock high-quality lubricants and lubricating sprays suitable for outdoor power equipment, including engine oil, brake cleaner or degreaser, penetrating oil, and a non-foaming grease for pivot points. Include fuel-system supplies such as clean, ethanol-free gasoline (where recommended), fuel stabilizer, a fuel filter, and a small funnel for clean refills. Replacement consumables like air filters, oil filters, spark plugs, drive belts, deck belts, and replacement blades should be organized and readily available. A clean work space with protective gloves, eye protection, and disposable rags or shop towels will help maintain safety and cleanliness during disassembly and reassembly.

Verification and testing equipment is used to confirm correct operation after service. Use a calibrated voltage tester or multimeter to verify electrical continuity and charging performance. A compression gauge can be employed to assess engine health, while a tachometer facilitates checking engine speed under load. For small engines and fuel systems, a vacuum gauge and manometer may be used to diagnose carburetion or vacuum leaks. A known-good battery, battery tester, and an appropriate charger should be available to confirm electrical readiness. Finally, complete a functional test bench or controlled test run to verify that protective devices, safety switches, and start/stop mechanisms operate correctly before returning the unit to service.

The Unit and Specifications Reference provides essential data required for accurate diagnosis, maintenance, and repair of the CRAFTSMAN 917.298351 equipment. This section consolidates engine and electrical system specifications, hydraulic and fuel system data, and critical torque values and clearances to ensure proper assembly and operation. Accurate specifications help technicians verify original tolerances, identify deviations, and plan their service procedures with confidence. Keeping these values up to date and cross-referenced with the machine’s serial data plate supports safe and reliable performance over the service life of the unit.

Engine and electrical system specifications include the governed maximum rpm, horsepower class, displacement, and compression range, as well as fuel requirements and ignition system details. It is important to confirm carburetor or fuel-injection settings, air-fuel ratios, and siting of any emission-related components during teardown and reassembly. Electrical parameters such as charging system output, battery voltage, alternator or magneto characteristics, and starter motor specifications ensure reliable cranking and steady electrical performance. When performing troubleshooting, these figures function as reference points to determine if an anomaly is feasible within design limits or indicative of wear or failure elsewhere in the system.

Hydraulic and fuel system data covers pump flow rates, pressure specifications, hose and fitting sizes, and reservoir capacities relevant to the unit’s hydraulic circuits. Inspectments should verify that hydraulic fluid type, viscosity, and contamination levels meet the manufacturer’s recommendations, as deviations can affect performance and component life. Fuel system data includes line diameters, injector or carburetor calibration, filter specifications, and fuel pump pressures. Maintaining correct pressures and flows is critical for optimal engine performance, smooth operation of attachments, and safety during operation under load or at high RPMs.

Torque values and clearances are provided for fasteners, bearings, and critical mating surfaces throughout the machine. Following recommended torques helps prevent over-tightening, which can distort housings or strip threads, as well as under-tightening, which may allow components to loosen during operation. Clearances, including piston, valve lash, bearing, and deck gap values, establish the tolerances necessary for efficient combustion, reduced wear, and dependable starts. Proper sequence and method for applying torque, along with any required preloads and lubricants, ensure consistent assembly that meets OEM specifications and supports safe, lasting performance of the unit.

Disassembly and Inspection Procedures

Preliminary checks and documentation: Before beginning any disassembly, gather the model number, serial number, and current symptoms reported by the user. Photograph or video the unit from multiple angles to establish a reference for later reassembly. Power down the equipment completely and disconnect any batteries or power sources in accordance with safety guidelines. Create a clean workspace with labeled containers for fasteners and a parts tray to avoid loss of small components. Document all observed clues such as unusual noises, vibrations, smoke, or fluid leaks, and note the operating environment and recent maintenance history to guide the inspection process.

Preliminary checks and documentation: Inspect the exterior and visible interfaces for signs of wear, corrosion, or damage that could indicate the root cause of a fault. Verify fluid levels, such as oil or fuel, and check for contamination or water intrusion in reservoirs and lines. Confirm the model's electrical safety compliance by ensuring cords, plugs, and switches show no signs of damage. If equipped, test basic starting and stopping functions at a low-risk stage to determine operational baselines, while maintaining lockout/tagout procedures to prevent accidental energization. Compile a concise fault hypothesis based on the combination of exterior condition, user reports, and initial operational tests to guide the subsequent disassembly steps.

Removal of major assemblies: Begin with the safest, least invasive removal steps, such as detaching covers, shields, and protective housings using the correct torque specifications to avoid damage. Remove major assemblies in a logical sequence, labeling each component and its mounting hardware to ensure accurate reassembly. When disconnecting wiring harnesses, take high-resolution photos and use color-coded markers or numbered tags to preserve correct connector orientation and circuit relationships. Support any heavy assemblies with secondary stands or clamps to prevent accidental drops and preserve diaphragms, seals, and gaskets. After removal, inspect the mating surfaces for warping, cracks, or signs of improper alignment that could indicate a more serious underlying issue requiring component-level attention.

Removal of major assemblies: Cleanliness is critical during disassembly to prevent contamination of internal passages and seals. Replace any gaskets or O-rings that show signs of wear or compression, and torque fasteners to the manufacturer’s specifications during removal and subsequent reassembly. Document the exact order of assembly and the specific fastener sizes and lengths used, as incorrect fastener placement can lead to misalignment or failure under load. Store removed assemblies in a designated area to avoid impact damage, and inspect the mounting hardware for deformation or thread damage that would necessitate replacement. If sensors or actuators are involved, test their electrical resistance and functional continuity prior to complete separation to avoid unnecessary downtime during reassembly.

Component inspection criteria: With major assemblies removed, establish a systematic inspection plan for each secondary component. Check drive belts, gears, and pulleys for glazing, cracking, or excessive wear, replacing them if any signs of fatigue are present. Examine seals, bearings, and lubrication passages for leakage, scoring, or drying, ensuring proper lubrication channels are free of debris. Evaluate electrical connectors for corrosion or loose crimps, and verify insulation resistance where applicable to prevent intermittent faults. Inspect cooling fins, filters, and heat exchangers for blockage or reduced airflow, and clean or replace as required to restore optimal thermal performance. Finally, document all findings with clear notes and, when applicable, specify corrective actions and suggested maintenance intervals to guide future service calls.

Removal and replacement procedures for the CRAFTSMAN 917.298351 require careful preparation and adherence to safety practices. Begin by disconnecting the battery and ensuring the PTO switch is in the off position to prevent accidental engagement. Clear the work area of debris and wear appropriate personal protective equipment, including gloves and eye protection. Before removing any components, consult the service manual for torque specifications and fastener sizes to avoid over-tightening or stripped threads. Use labeled containers to organize hardware as you detach parts, which helps prevent reassembly errors and ensures correct alignment during reinstallation. Document the disassembly process with photos if possible to create a reference for future maintenance needs.

Belt and pulley replacement involves inspecting the condition of all belts for cracks, fraying, glazing, or missing teeth, and checking accessory pulleys for wear or misalignment. To access the belt path, remove any shielding or covers that obstruct visibility, taking care not to bend or twist sensitive wiring. When removing the old belt, note the exact routing pattern and refer to the diagram to ensure proper reassembly. Install the new belt with the correct tension, using a tensioning tool if specified, and verify that the belt seats properly in all grooves. After reassembly, rotate the pulleys manually to confirm smooth operation without binding, and then reinstall any guards or shields that were removed during the process. Recheck belt tension after a short test run once the engine reaches operating temperature to ensure long-term reliability.

Mower deck service and replacement requires careful alignment to maintain even cut and safe operation. Begin by removing the mower deck from the tractor, supporting it with the appropriate stand or supports to prevent bending or damage. Inspect blade spindle assemblies, bearings, and the anti-scalp wheels for wear and replace components as needed, ensuring all fasteners are torqued to the manufacturer’s specifications. When removing the deck, inspect the deck rivets or welds for cracks and verify that the deck mounting brackets are not bent. During installation, align the deck with the mower frame and ensure the belt drive and pulleys are correctly aligned to prevent belt wear. After reinstalling the deck, perform a ground test to verify smooth engagement of the blades and even height adjustment across all cutting units. Regularly check blade balance and replace dull or damaged blades to maintain optimal performance and safety.

Electrical harness and sensor replacement demands careful routing and secure connections to prevent interference and shorts. Disconnect the battery before handling any electrical components, and label connectors to simplify correct reconnection. When removing the harness, document the path and attach point locations to ensure accurate reassembly, paying close attention to securing clips and fasteners that prevent movement during operation. Inspect sensors for corrosion, loose wiring, or damaged seals, replacing any failed parts with OEM equivalents to preserve system tolerances and diagnostic reliability. Upon reinstalling the harness, verify that all electrical connectors click firmly and that there is no pinched wiring along moving components or near hot surfaces. Perform a system self-check by turning on the power and using diagnostic prompts if available, ensuring that all monitored circuits report normal status and that sensors respond correctly to test inputs.

Lubrication and Routine Maintenance

Regular lubrication is essential to extend the life of your outdoor power equipment and to ensure smooth operation under demanding conditions. Begin by inspecting the unit for any signs of oil leaks, loose fasteners, or worn components before performing any lubrication tasks. Use manufacturer-approved lubricants and follow the recommended viscosity and type to prevent varnish buildup or inadequate lubrication. When applying lubricants, focus on pivot points, linkages, and moving joints where friction can degrade performance over time. Ensure the machine is cool and on a stable surface to avoid accidents and to allow proper penetration of oils into housings and bearings.

Maintaining a consistent lubrication routine helps minimize wear and resale value loss, reduces the risk of sudden failures, and keeps performance at peak levels during peak usage periods. Keep a clean work area and wipe away dirt and debris from components prior to lubrication to prevent contaminants from entering critical systems. After applying lubricant, operate the controls briefly to distribute the lubricant evenly, then recheck for any signs of seepage or unusual noise. Document the date and type of lubricant used for future maintenance reference and warranty compliance.

Lubrication schedule: Establish a clear maintenance rhythm aligned with operating hours, climate, and workload. For most smaller units, lubricating once per season or after every 25 hours of operation is a practical starting point, adjusting for heavy use or dustier environments. Record each service in a maintenance log, noting the lubricant type, amount applied, and sections serviced. Align the schedule with filter changes and fuel system checks to avoid overlapping maintenance tasks that could lead to unnecessary downtime. Periodically inspect seals and gaskets for signs of drying or cracking, replacing them promptly to preserve lubricant containment and system efficiency.

Oil and filter changes: Drain the old oil into a suitable containment container, then replace the drain plug with a clean washer if required and refill with the recommended oil grade to the correct level. Change any fuel filters according to the service interval, using manufacturer-supplied parts to maintain proper fuel flow and combustion efficiency. After refilling or replacing components, run the engine briefly to circulating new oil and verify that there are no leaks around gaskets or seals. Dispose of used oil and filters in accordance with local environmental regulations and recycling programs; never mix used engine oil with other fluids as this can create hazardous waste and damage the disposal stream.

Air filter and fuel system maintenance: Regular inspection of the air intake path is crucial to prevent dirty air from reducing engine performance. Remove the air filter and clean or replace it according to the operating environment and manufacturer guidelines; a dirty filter can restrict airflow, cause overheating, and increase fuel consumption. Carefully inspect the air duct for cracks or loose connections and reseal as needed to maintain a sealed intake system. In the fuel system, inspect hoses and clamps for signs of wear, leaks, or hardening, replacing any compromised components. Use fresh fuel and stabilizers if the unit will be stored for an extended period, and consider adding a fuel system cleaner during periodic maintenance to prevent varnish formation in carburetors or fuel injectors. After servicing, ensure all connections are secure, test run the equipment, and confirm that the engine maintains proper idle and acceleration without hesitation or stalling.

Troubleshooting and Diagnostics

When diagnosing a malfunction in the CRAFTSMAN 917.298351, begin with a clear description of the symptom and establish a baseline for normal operation. Visually inspect the unit for obvious signs of wear, damage, or loose connections, paying close attention to electrical harnesses, control switches, and safety interlocks. Document any abnormal readings or irregular noises, and confirm that the fuel system, air intake, and exhaust paths are free of obstructions. Establish a safe testing environment by disconnecting power sources as needed and using appropriate personal protective equipment. A methodical approach reduces guesswork and helps trace the issue to its root cause, whether it stems from a mechanical binding, an electrical fault, or a control fault.

Electrical diagnostics require attention to voltage integrity, continuity, and proper grounding. Verify that the battery or power supply maintains the specified voltage under load and inspect all fuses and circuit breakers for signs of wear or tripping. Use a multimeter to check wiring continuity between the harness connectors, ignition switch, and relay modules, and test for short circuits to ground or to adjacent circuits. If a sensor or switch is suspected, measure its resistance or output signal while the system is in a safe, powered-down state, and compare against the manufacturer’s reference values. Document any readings that deviate from spec and proceed with targeted component testing, keeping in mind that intermittent faults may require repeated measurements and vibration testing during operation.

Performance troubleshooting focuses on engine speed, cutting efficiency, and load response. Examine the carburetor or fuel injection system for proper fuel delivery, idle speed, and mixture settings, ensuring that air filters are clean and not restricting airflow. Check the ignition timing if applicable and verify spark quality, ensuring consistent ignition under load. Inspect the cooling system and ventilation to prevent overheating, especially during extended operation or high-load tasks. If performance issues surface only under load, verify the alignment and tension of belts, pulleys, and drive shafts, as well as clutch operation and gear engagement. A thorough performance assessment helps isolate issues that affect power delivery and operational control, enabling precise adjustments and safe operation restoration.

The reassembly process begins with a clear plan to ensure accurate placement of all components. Start by verifying that all fasteners are accounted for and correctly sized according to the manufacturer’s specifications. When reinstalling main assemblies, align per the original mating surfaces and torque fasteners in the recommended sequence to prevent misalignment or binding. As components are brought together, use a clean, lint-free cloth to remove any debris or residual lubricants that could compromise performance. Document any deviations from the standard assembly in a maintenance log to support future service needs and traceability. Applying a light coat of lubricant to moving interfaces is essential, but care must be taken to avoid over-lubrication that could attract dirt or cause slippage of belts and gears.

Torque checks are critical to maintaining safe and reliable operation. After reassembly, verify that each fastener is tightened to the specific value listed in the service documentation, using a calibrated torque wrench. Pay close attention to fasteners arranged in a cross-pattern or sequence to distribute clamping force evenly and prevent warping or uneven seating. Recheck torques after a brief operating cycle, as thermal expansion can alter clamping force. If any fasteners exhibit signs of stripping or damage, replace them with OEM parts before continuing. Maintain a record of torque values checked and any adjustments made to support future maintenance cycles.

Functional testing procedures begin with a thorough pre-run inspection, confirming that safety devices, guards, and interlocks are correctly installed and operate as designed. Start the engine or power source in a controlled environment, listening for abnormal sounds such as grinding or rattling, which may indicate misalignment or failed components. Observe operating temperatures, fluid pressures, and electrical readings to ensure they remain within specification throughout the test cycle. Perform a series of load and idle tests to confirm proper belt tension, smooth gear engagement, and consistent emission levels if applicable. If performance anomalies are detected, isolate the fault using a methodical approach, such as parasitic load checks or component-by-component testing, before disassembly or part replacement. Record all test results, including any corrective actions taken, to support ongoing reliability analysis.

Final inspection criteria focus on confirming that the unit meets all functional and safety standards before returning it to service. Visually inspect for uniform gaps, aligned housings, and proper seal seating around covers and joints. Verify that control responses are repeatable, with smooth starts, stops, and predictable responses to throttle or input commands. Ensure that inspections of air intakes, cooling fins, and exhaust paths show no obstructions or signs of overheating. Check that lubricants, fuel, and hydraulic fluids are at proper levels and free of contamination, replacing any clogged or compromised lines as needed. Confirm that labeling, decals, and safety notices are legible and correctly applied. Finally, document the completion of the reassembly and quality assurance process, including a summary of observed conditions, test results, and any recommended preventive maintenance actions for the next service interval.

Safety and maintenance documentation is an essential component of responsible equipment ownership. Proper record keeping ensures that all service, maintenance, and part replacements are traceable, which supports safe operation and efficient troubleshooting. A well-maintained log should include dates of service, parts used, the technician or service provider, and a brief description of performed procedures. Keeping copies of receipts, warranty cards, and any recalls or technician notes helps create a comprehensive history that can be reviewed quickly when addressing performance concerns or scheduling preventive maintenance. Regularly updating these records after each service visit minimizes the risk of missing critical information that could affect safety or equipment reliability.

Record keeping and service logs should be organized in a secure and accessible location, whether in a physical binder or a digital database. For outdoor power equipment, it is prudent to track oil changes, air filter replacements, spark plug changes, blade or cutting accessory maintenance, and battery or charging system inspections. Documenting operating hours, usage conditions, and environmental factors can also provide insight into wear patterns and potential issues. In addition, maintain a checklist that is completed during each service event to ensure no important step is overlooked. This proactive approach reduces downtime and extends the life of the equipment by promoting consistent maintenance practices.

Warranty considerations and recalls require careful attention to ensure that eligible repairs and replacements are processed correctly. Verify that maintenance actions align with manufacturer recommendations and that any required service entries are recorded to support warranty claims. Be aware of recall notices published by the manufacturer or regulatory bodies, and take prompt action to implement recommended remedies. Maintain copies of warranty documentation, including coverage periods, terms, and exclusions, so that disputes are minimized if a claim arises. A structured approach to warranty management helps protect the owner’s investment and ensures compliance with safety standards throughout the equipment’s life cycle.

End of service life guidance for power equipment involves planning for safe decommissioning, disposal, or recycling. When a unit approaches the end of its useful life, document the intended disposition, such as retirement, resale, or donation, and follow any applicable environmental regulations. Record removal of hazardous materials, drained fluids, and proper disposal of components in accordance with local laws. Include instructions for storage of residual parts, manuals, and any salvageable items that could be reused or repurposed. A clear end of life plan reduces the risk of leaks, environmental impact, and improper disposal while facilitating responsible asset management for the owner or fleet operator.