STIHL RZ142 Service Manual

STIHL RZ142 Service Manual

The section service manual overview provides a concise yet comprehensive snapshot of the maintenance and repair framework for the STIHL RZ142 riding mower. It establishes the purpose and scope of the manual, clarifying the types of service activities covered, including routine lubrication, routine inspections, component replacement, and troubleshooting procedures. This overview also highlights the intended audience, such as qualified technicians and experienced enthusiasts, ensuring that readers understand the level of expertise required to perform procedures safely and effectively. By outlining the core functions and capabilities of the RZ142, this section sets expectations for the depth and breadth of information that follows, creating a reliable reference point for all service tasks. The overview emphasizes that adherence to the manufacturer’s specifications is essential to maintaining performance, safety, and warranty compliance throughout the equipment’s service life.

The safety and prerequisites portion focuses on establishing a robust foundation for all work performed on the STIHL RZ142. It details essential safety gear, personal protective equipment, and environmental considerations necessary to mitigate risk during maintenance operations. The section covers prerequisite checks such as ensuring the machine is on firm, level ground, disconnecting the power source, and relieving residual pressure in hydraulic or fuel systems where applicable. It also prescribes up-to-date training requirements and the importance of consulting the service manual for model-specific safety warnings. Readers will find guidance on verifying tool calibration, securing the work area, and employing proper lifting techniques to prevent injuries and equipment damage. This portion reinforces a safety-first mindset, ensuring that technicians approach each task with deliberate, planned steps rather than ad hoc actions.

Document organization and access outlines how information is structured within the manual and how technicians should navigate it for efficient service. It clarifies the arrangement of sections, tables, and illustrations, and explains how to locate model-specific information for variations within the RZ142 line. The overview notes that digital resources and printed copies may be available, with guidance on accessing the most current revisions and service bulletins. It also describes the use of numbered procedures, cross-references, and troubleshooting flowcharts to streamline diagnostic processes. The emphasis is on clarity and consistency, ensuring technicians can quickly find safety notes, parts lists, torque values, and service intervals without ambiguity. This portion reinforces the importance of maintaining organized records of all service activities for future maintenance and warranty adherence.

The STIHL RZ142 is a reel lawn mower designed to provide precise cutting performance with reliability in lawn maintenance. This section outlines the essential operating specifications, control locations, and typical procedures to help technicians and operators understand how to safely and effectively use the machine. Proper adherence to the specifications ensures optimal cutting results, efficient fuel use, and extended equipment life. Regular verification of the stated values against the actual unit is recommended during maintenance cycles to confirm correct operation.

Product overview and specifications: The RZ142 features a robust engine arrangement, ergonomic handle structure, and precision cutting reels designed for consistent mulch-free grass clipping. The powertrain is calibrated for smooth engagement of the cutting mechanism, with a clutch system that modulates reel rotation based on throttle input. Overall weight distribution is optimized to minimize operator fatigue and maximize maneuverability on varied terrain. Fuel capacity, oil requirements, and recommended service intervals are specified to maintain peak performance and reduce the risk of breakdowns during extended use. Always refer to the serial plate for exact model specifications and ensure any replacement parts meet or exceed OEM standards.

Control locations and meanings: The control layout is intended for intuitive operation, with clearly marked levers and switches that correspond to specific functions. The throttle control adjusts engine speed, which in turn governs reel rotation and mowing speed. A safety bar and grip mechanism ensure the operator maintains proper posture and hand position during use, and disengagement of this control quickly stops the reel if needed. The blade engagement switch activates the cutting reels only when the mower is ready for operation, reducing the risk of accidental starts. A choke or fuel enrichment control is provided for cold-start conditions and should be used according to the startup procedure. Regular inspection of all control linkages and safety interlocks is essential to guarantee reliable operation and safe performance.

Typical operating procedures: Before starting, perform a thorough check of the machine, including fuel level, oil condition, and blade clearance. Inspect air filters, cooling fins, and the cutting reels for obstructions that could impair performance or cause excessive wear. When starting the engine, follow the recommended sequence, ensuring the control lever is in the correct disengaged position and that the choke is set appropriately for ambient temperature. During operation, maintain a steady speed and avoid aggressive throttle changes that could stress the drive system. If you encounter unusual vibration, excessive noise, or a loss of cutting efficiency, stop the engine and perform a safety shutdown procedure, then inspect the recoil mechanism, drive belt, and reel bearings for wear or damage. After use, clean the unit, remove grass clippings from under the deck, and perform a quick lubrication of pivot points and reel bearings as specified by OEM maintenance guidelines.

In addition to the above, operators should always wear appropriate PPE, including eye protection, hearing protection, and gloves, and maintain a clear working area free of debris or persons. Proper storage conditions, including a dry environment and battery or fuel stability considerations if applicable, will further extend the life of the RZ142. Documentation of routine maintenance tasks and any part replacements should be kept on file to aid service history and future diagnostics. By following these procedures and adhering to the manufacturer’s specifications, technicians can ensure safe operation, consistent cutting performance, and a long service life for the STIHL RZ142.

The STIHL RZ142 requires careful pre-service checks and preparation to ensure safe and effective maintenance. Begin by assembling all required tools and personal protective equipment (PPE) before starting work. This includes standard hand tools, torque wrenches, a multimeter if electrical diagnostics are needed, and a clean workspace with adequate lighting. PPE such as safety glasses, cut-resistant gloves, hearing protection, and a dust mask or respirator should be worn as appropriate for the tasks performed. Verifying that all tools are in good condition and calibrated helps prevent slips or incorrect torque that could affect reassembly or performance.

Safety checks before maintenance are essential to protect both the technician and the machine. Disconnect power to the equipment and remove the battery or ensure the spark plug is disconnected to prevent unexpected starts. Drain any residual fluids in accordance with manufacturer guidelines and environmental regulations to minimize spill risk and contamination. Inspect the operator presence controls, safety switches, and fuel system for proper function and integrity, replacing any damaged components prior to service. Establish a stable work surface, secure the mower from movement, and have a fire extinguisher or spill kit readily available in case of emergencies. These steps reduce the likelihood of injury and environmental harm during maintenance activities.

Environmental and waste considerations must be addressed to comply with regulations and promote sustainable service practices. Collect and contain any used fluids, filters, and batteries in labeled, leak-proof containers for proper disposal or recycling through certified facilities. If replacing parts, verify compatibility and record parts used for future service history. Clean the exterior and accessible internal areas with approved solvents and methods that do not damage seals or coatings. Dispose of packaging, rags, and contaminated materials according to local environmental guidelines, and document waste streams for traceability during audits or inspections. Adopting these practices helps minimize environmental impact while maintaining the machine’s reliability for the operator.

The STIHL RZ142 requires careful, methodical disassembly to access internal components while preserving structural integrity. Begin by ensuring the unit is powered down and unplugged from any power source, and disconnect any attached battery packs if applicable. Use a clean, organized workspace with labeled containers for fasteners to prevent misplacement. Document each step with notes or photos to provide a reference for reassembly, as correct orientation and torque can affect alignment and performance. When handling sensitive plastic housings, apply even, gentle pressure and avoid forceful prying that could induce cracks. A magnetized screwdriver and a small parts tray help keep screws and clips in order, reducing the risk of misplacement during the process.

Removing covers and housings involves locating all screws, clips, and hidden fasteners that secure the outer shell to the chassis. Start at the least conspicuous fasteners to minimize the chance of cosmetic damage, using appropriate drivers for each screw type to prevent stripping. As you detach each cover, inspect the mating surfaces for wear, tabs, and alignment pins that might influence reassembly. Keep track of any spacers or bushings and note their original positions. When prying panels apart, use plastic tools to avoid marring finishes, and work gradually to release internal latches without overstressing the mounting points. If a fastening point resists removal, reassess for hidden screws or safety interlocks before applying additional force.

Accessing drive and chassis components requires a systematic approach to avoid damaging delicate electronics and drivetrain interfaces. Begin by identifying the drive module, control board, and cooling assemblies, then disconnect any power or data cables with minimal torque to prevent connector damage. Label each connector and photograph the orientation before removal to ease reinstallation. Remove shielding or brackets in a controlled sequence to maintain order and prevent misalignment of fans or heat exchangers. When removing the drive assembly, support it to prevent dropping and potential impact damage to the circuit boards. After components are exposed, perform a visual inspection for loose connections, pinched wires, or signs of wear, and replace any damaged parts according to the manufacturer’s torque specifications. Reassembly should follow the reverse order, ensuring that all seals, gaskets, and insulating layers are correctly seated to preserve environmental protection and electrical isolation.

The drive system of a STIHL machine is a precision ensemble designed to transfer power from the engine or motor to the drive wheels or cutting implement with minimal loss and maximum reliability. Regular inspection of belts, pulleys, bearings, and fasteners is essential to maintain optimal traction, efficiency, and safety. Begin with a visual check for cracks, glazing, fraying, or unusual wear on belts, and inspect pulleys for grooves, misalignment, or corrosion. Any signs of damage should prompt immediate replacement or service to prevent overheating, belt slippage, or sudden drive failure during operation. Maintain a clean laying surface for belts and pulleys during inspection to avoid contaminants that can cause accelerated wear or slipping conditions. Document findings at each service interval to track wear trends and establish replacement timelines based on usage patterns and operating loads.

Belt and pulley inspection and replacement require careful attention to alignment, tension, and condition. Remove any protective covers only after ensuring the engine is off and cooled, and always release residual stored energy before handling moving components. Examine belts for cracks, chunks missing, glazing, or embedded foreign material, and inspect pulley faces for unusual wear or scoring. Replace belts in matched sets if the drive system uses more than one belt to maintain balanced power delivery. When reinstalling belts, align them within the belt grooves and confirm that there is no slack at the center of the belt run. Use manufacturer-specified replacement parts and torque fasteners to the recommended values to preserve drive integrity and prevent premature failures. After installation, rotate the drive system manually to verify smooth operation and absence of rubbing or abnormal resistance before returning the machine to service. Document the belt part numbers, wear findings, and replacement dates for future maintenance planning.

Tensioning and alignment procedures are critical to achieving proper drive performance and extending component life. Start with a cold engine and follow the exact tension specification published for the model, using a calibrated tension gauge or the specific deflection method recommended by STIHL. Avoid over-tensioning, which can increase bearing load, reduce belt life, and cause premature pulley wear; under-tensioning can result in belt slipping and power loss. Use alignment tools or reference marks on pulleys to ensure the belt tracks centrally within each groove and remains square to the pulley faces. Recheck tension and alignment after a brief operation to allow the belt temperature to stabilize, as thermal expansion can alter tension readings. Periodically inspect idler and tensioner pulleys for wobble or bearing play, replacing any worn components to preserve consistent belt tension. Keep the drive area free of oil, dirt, and debris that could cause belt slip or misalignment, and perform a final functional test under load to confirm proper performance before returning the equipment to service.

Section drive motors and electronics

The drive system of the STIHL RZ142 integrates both motor performance and electronic control to deliver smooth propulsion and precise operational feedback. Begin with a baseline check of motor specifications against the manufacturer’s service data, verifying voltage, current draw, and rotational speed under normal load. When testing, ensure the unit is in a safe, stable position and that all safety interlocks are engaged to prevent accidental movement. Record any deviations from nominal values and correlate them with possible accessory wear, wiring issues, or controller faults. This section emphasizes a systematic approach: measure, compare to specification, and document findings for traceability and future maintenance actions. Consistent testing helps identify creeping drift in motor performance before it impacts drive reliability or operator control.

Electrical safety and diagnostics are foundational to maintaining drive motors and electronics. Before any diagnostic work, disconnect the primary power source and isolate the battery or energy storage components according to established lockout procedures. Use insulated tools and confirm absence of residual charge before handling connectors or control modules. Systematic diagnostics involve checking continuity across motor windings, ignition or brake circuits, and the main relay pack, while also inspecting harnesses for insulation damage or loose connections. Employ a multimeter to verify voltage references at the control module and sensor inputs, and consult the service data for acceptable resistance ranges. If irregular readings appear, pursue a structured fault isolation path, tracing symptoms back through the electrical chain to identify a root cause. Always follow safety protocols to prevent shock or short circuits during investigations.

Sensor and control module inspection requires careful evaluation of input and output signals that govern drive behavior. Begin by inspecting wheel speed sensors, position encoders, and any gyroscopic or accelerometer devices for alignment, cleanliness, and secure mounting. Check for corrosion on sensor terminals and verify that connector housings are undamaged and properly seated. The control module should receive clean, noise-free signals; inspect shielding on wiring runs and ensure proper grounding practices are in place. Through diagnostic scans, confirm that fault codes align with observed mechanical or electrical symptoms, and clear any non-critical codes after corrective actions. When testing, simulate normal operating conditions to observe how sensor feedback translates into motor response, watching for delayed or erroneous acceleration, braking, or steering adjustments. Document all sensor and module conditions, including timestamps and observed behaviors, so future technicians can reproduce the diagnostic path if needed.

Fluid types and change intervals: The STIHL RZ142 operates with coolant and hydraulic fluids that are selected for compatibility with the engine and hydraulic pump materials. Use the manufacturer-recommended coolant mixture for ambient operating temperatures, ensuring the solution inhibits corrosion, manages freeze protection, and maintains proper boiling points. For hydraulic circuits, select a hydraulic fluid with the correct viscosity grade as specified in the service manual, and verify that the fluid meets the applicable ISO or SAE standards. Regularly inspect fluid levels and replace fluids according to the prescribed service intervals, which are based on operating hours and environmental conditions. Keep detailed maintenance records, including batch numbers and service dates, to track fluid life and quality over time. Ensure all fluids are clean and free of contaminants prior to top-offs or replacements to prevent premature wear of seals and hydraulic components.

Cooling system inspection and service: The cooling system in the RZ142 is essential for maintaining optimal engine temperature and preventing overheating during operation. Check for secure mounting of radiators, hoses, and clamps, and inspect fans for proper operation and any obstructions that could impede airflow. Look for signs of coolant leakage, crusty residue, or damaged caps that could compromise pressure and cooling efficiency. Verify coolant concentration and replenishment levels, and perform a complete flush and refill according to the service schedule when indicated by hours of operation or temperature indicators. When servicing, use the exact coolant type recommended by STIHL and mix to the specified ratio, ensuring the system is purged of air pockets to maintain consistent cooling performance. After service, run the engine to normal operating temperature and monitor temperature gauges to confirm stable readings and no residual leaks.

Leak detection and repair: Leaks in hydraulic and cooling systems can lead to reduced performance and potential component damage. Start with a thorough visual inspection of all hoses, fittings, seals, and reservoir caps for signs of dampness, staining, or crusty buildup around joints. Use a leak-detecting solution on threaded connections and gaskets to localize seepage, and listen for audible air or fluid sounds that indicate a leak in the hydraulic circuit. If leaks are found, replace damaged hoses or seals with OEM-approved parts and torque connections to the manufacturer’s specifications to prevent recurrence. For cooling leaks, inspect radiator cores, clamps, and radiator cap integrity, replacing any defective components and ensuring the cooling system maintains proper pressure. After any repair, perform a pressure test and monitor for an extended period to verify leak-free operation under typical operating loads. Document the findings, parts used, and test results to support ongoing maintenance planning and reliability.

Filtration maintenance

The filtration system on the STIHL RZ142 is critical to maintaining engine longevity and consistent performance. Regular inspection should begin with visual checks of the air intake housing for cracks, obstructions, or loose fasteners, followed by inspecting the air filter medium for excessive dirt, oil saturation, or damage. When a filter shows signs of contamination beyond simple cleaning, replace it with the correct OEM part to preserve airflow and filtration efficiency. After filter replacement or cleaning, verify a proper seal by reassembling the housing and ensuring there are no gaps around the air box lid, which could allow unfiltered air to bypass the filter. Schedule filtration maintenance with the engine’s operating hours and environmental conditions in mind, increasing frequency in dusty or sandy environments to prevent premature wear.

Additionally, monitor the pre-cleaner if equipped, ensuring it remains free of debris and functions as designed to extend the life of the primary filter. Some models employ a foam pre-filter that can be rinsed and lightly oiled; allow it to dry completely before reinstalling to prevent hydrocarbon odors or degraded filtration. Keep the intake paths clear of vegetation and debris during storage and routine use, as blockages can cause abnormal air pressure differentials and reduced engine performance. For engines with a secondary filtration stage, inspect each element for tears or deformations, replacing any compromised components promptly to maintain optimal sealing and filtration performance.

Lubrication points and intervals

Liberating and maintaining appropriate lubrication on the STIHL RZ142 minimizes friction and wear, extending pivot points and moving assemblies’ service life. Identify all lubrication points, including chain adjustments, drive shafts, linkages, bearings, and linkage pivots, then establish a lubrication schedule aligned with operation cycles and ambient conditions. Use the recommended lubricant type, viscosity, and quantity specified in the manual to achieve reliable protection without attracting dust or causing residue buildup. When performing lubrication, clean surrounding surfaces to prevent dirt from entering joints, and apply an even, light coating to hinges and bushings rather than heavy saturation, which can attract grime. Periodic disassembly may be required to access certain sealed bearings; in those cases, replace seals if any wear is detected to maintain contaminant exclusion and lubrication retention.

Record the lubrication interval after each service, noting operating conditions such as temperature, load, and duration of use, as these factors influence lubricant degradation. If a lubrication point shows signs of stiffness, unusual resistance, or squeaking, discontinue use and inspect for misalignment, worn components, or insufficient lubrication. For automated or semi-automated systems, verify that lubrication lines are free of kinks or blockages and that no air pockets exist in the injector or reservoir. Finally, verify that lubricant reservoirs are sealed correctly to prevent contamination ingress and maintain consistent lubricant delivery across all points.

Seal and gasket inspection

Seals and gaskets play a vital role in maintaining compression, fluid containment, and contaminant exclusion within the STIHL RZ142. Begin inspections by checking the crankcase and valve covers for any signs of oil seepage around gaskets, mating surfaces, or fastener areas, which may indicate a deteriorated seal. Use a clean, dry cloth to wipe away residue and perform a visual inspection for cracks, hardening, or loss of elasticity; replace any seal or gasket that shows signs of degradation. When removing components for service, replace any seals that are disturbed or compressed to ensure a proper seal upon reassembly. It is essential to reuse or replace gaskets with the correct thickness and material recommended by the manufacturer to prevent leaks and ensure proper torque retention.

During reassembly, apply a compatible gasket sealant only where specified by STIHL’s service guidelines, avoiding excess sealant that could contaminate moving parts or enter the combustion area. After installation, perform a leak test by running the machine at idle and under load to confirm there are no draughts or seepage around the gasket lines. If oil or fuel odors are detected near seal joints during operation, recheck gasket seating and torque values, and recondition as needed. Maintain a proactive approach to seal health by incorporating inspection into every major service interval, thereby reducing the risk of unexpected failures and preserving overall engine integrity.

Section diagnostic procedures and troubleshooting

Interpreting error codes is the first step in diagnosing issues with the STIHL RZ142. Each error code provides a concise fingerprint of the fault condition, enabling technicians to quickly identify suspect subsystems without unnecessary disassembly. Start by recording the exact code displayed or logged by the control system, noting any patterns such as intermittent illumination or persistent faults. Cross-reference the code against the manufacturer’s fault code table, paying close attention to accompanying indicators like engine RPM limits, sensor warnings, or ignition status. If codes are ambiguous or appear during startup, verify that sensor connectors are seated properly and that the battery or power supply meets minimum voltage requirements. Document any environmental conditions present at the time of the fault, such as temperature, humidity, or recent maintenance actions, as these factors can influence code interpretation. A systematic approach to code verification reduces diagnostic time and minimizes unnecessary component replacement.

Symptom based troubleshooting flowcharts provide a practical roadmap for resolving everyday issues. Begin with the most observable symptom, such as difficulty starting, loss of power, excessive vibration, or abnormal noise, and trace the problem through high-level systems to specific components. Each step should guide you through verification tests, expected results, and safe corrective actions. Maintain a test log that records measurements, tool settings, and observed anomalies, which helps identify recurring patterns and ensures consistency across service events. Flowcharts are especially valuable for field technicians, offering repeatable processes that align with warranty and service program requirements. When a symptom does not align with a known flowchart, escalate to a more comprehensive diagnostic method, ensuring that safety procedures are always followed. Use flowchart insights to prioritize parts replacement only after confirming root cause through reproducible checks.

Common faults and corrective actions cover the bulk of routine service scenarios for the STIHL RZ142. Typical issues include fuel system disturbances, ignition faults, air intake blockages, cooling system inefficiencies, and electrical connector problems. For fuel-related faults, inspect the fuel quality, hoses, clamps, and the fuel filter, replacing components as necessary and ensuring there are no leaks or air ingress. Ignition faults often stem from coil or spark plug wear, dirty contacts, or wiring degradation; conduct a spark test, inspect the coil resistance within manufacturer specifications, and clean or replace affected parts. Air intake problems may arise from clogged filters or obstructed ducts, so perform a thorough cleaning and replacement schedule, and verify that the air paths are unobstructed. Cooling system faults require checking for coolant level consistency, radiator cleanliness, and thermostat operation, followed by a pressure test to confirm system integrity. Electrical faults should be approached with care, verifying harness integrity, connector cleanliness, and secure grounding, then scanning for any error codes that correlate with the observed symptom. In all corrective actions, ensure that parts replacements comply with OEM specifications and that post-repair testing demonstrates normal operation across all modes and load conditions.

Section maintenance schedule and records

Maintaining the STIHL RZ142 through a structured maintenance schedule is essential for preserving performance, safety, and longevity. A well-planned preventive routine helps identify wear before it leads to failures, minimizes downtime, and ensures consistent cutting quality and propulsion efficiency. Establishing clear intervals for inspection, lubrication, and part replacement allows technicians and owners to track condition over time and coordinate service with usage patterns. The following discussions outline how to implement a practical calendar, document everything, and determine replacement timing for critical components.

Preventive maintenance calendar starts with a baseline service after initial break-in and then proceeds with regular checks at defined intervals. The calendar should consider operating hours, frequency of use, environmental conditions, and loading requirements. Typical practice includes daily quick checks, weekly detailed inspections, monthly component tests, and semi-annual or annual comprehensive services. Keep a consistent schedule by using a dedicated maintenance log and aligning it with the machine’s usage data from hours meters or operator records. Regular calendar adherence reduces risk of unexpected downtime and supports warranty compliance where applicable.

Service logs and record keeping are central to tracing the RZ142’s history and planning future interventions. Each entry should capture date, hour meter reading, technician name, observed conditions, actions taken, and parts replaced. Maintain a log of lubrication points, filter cleanliness, belt tension, and drive system wear, as these items commonly influence performance. Use standardized forms or digital records to facilitate searching and trend analysis, enabling you to detect gradual degradations such as diminishing blade edge quality or rising drive temperatures. Accurate records also support parts forecasting and inventory control, ensuring that necessary components are available when needed.

Parts replacement intervals are determined by material wear, service experience, and manufacturer recommendations. Critical components for the STIHL RZ142 include drive belts, bearings, blades, cooling fins, air filters, and lubrication points. Replacement timing should be based on observable wear indicators, such as blade dullness, excessive vibration, unusual noises, or degradation in cutting performance. Establish conservative replacement thresholds to avoid performance losses or safety risks, and adjust intervals based on operating conditions like dust, debris, or heavy loads. Regular inspection of fasteners and mounting hardware is essential, because loose connections can accelerate wear and lead to misalignment or vibration. By documenting interval decisions and re-evaluating them with every service, you ensure the machine remains reliable and safe for operator use.

The final phase of servicing the STIHL RZ142 involves a thorough set of functional test procedures designed to verify that all systems operate correctly after maintenance. Begin by confirming that the engine starts reliably under various loads and temperatures, noting any unusual sounds or vibrations. Check the starting circuitry, electrical connections, and ignition timing with calibrated diagnostic tools to ensure they meet manufacturer specifications. Operate all control levers, safety devices, and interlocks to confirm smooth engagement and proper disengagement. Document any deviations and perform corrective adjustments as needed before proceeding with performance verification.

Performance verification focuses on validating that the machine delivers the expected cutting efficiency, propulsion stability, and drive system reliability. Conduct a series of test cuts on representative material characters while monitoring engine rpm, belt tension, and deck lift consistency. Assess traction performance on varied terrain to ensure consistent drive response and braking control. Verify that hydraulic or belt-driven components respond to operator inputs without lag, ensuring predictable and safe operation. Record data such as fuel consumption, blade or cutter condition, and temperature readings to establish a baseline for ongoing maintenance needs.

Final safety and compliance checks synthesize the results of prior testing into a comprehensive safety validation. Inspect all guards, shields, and safety features for secure mounting and unobstructed operation. Confirm that warning labels are legible and that all required safety devices function as intended, including blade brake systems or equivalent protections. Ensure that emissions and noise levels comply with applicable standards and that any required compliance documentation is up to date. Complete a sign-off that reflects completion of tests, with notes on any corrective actions taken and recommendations for future inspections or service intervals. Maintain complete records for traceability and future diagnostics.