MJ502M Manual Quad-Wheel Reel Mower Sun Joe® MJ502M Manual Quad-Wheel Reel Mower With Grass Catcher | Product Guide ☀️ Sun Joe® Product Guide20-Inch Cutting Width 9-Position Height Adjustment 2-Year WarrantySee Joe Mow — No Gas, No Cords, No Emissions.The Sun Joe® MJ502M Manual Quad-Wheel Reel Mower With Grass Catcher is a human-powered reel mower designed for small to medium lawns. It uses 5 steel blades, a 20-inch cutting width, and 9-position manual height adjustment from 1.2 inches to 2.4 inches for a quiet, clean cut without gas, electricity, oil changes, spark plugs, or pull cords.🌱 Human-Powered Reel Cut 🚫 No Gas, No Cords 🧺 8.5-Gallon CatcherMeet the MJ502M Key Components🤲Foam grip — padded handle area for comfortable pushing🧩Upper handle — top handle frame used to guide the mower🔩Upper handle knobs and bolts — secure the upper handle to the middle handle bars🧱Middle handle bars — connect the upper handle to the lower handle🔧Lower handle knobs and bolts — secure the handle assembly to the lower handle section🧺Grass catcher — 8.5-gallon rear collection bag for grass clippings📏Height adjustment levers — 9-position manual cutting height adjustment🛞Quad wheels — two 10-inch front wheels and two 6-inch rear wheels for stability🌀5 steel blades — manual reel cutting system for clean grass cutting🧰Hex wrench — included for cutting bar adjustment during the paper testTechnical SpecificationsSpecificationMJ502MProduct TypeManual quad-wheel reel mower with grass catcherBest UseSmall to medium residential lawnsPower SourceManual / human-poweredRotor5 steel bladesCutting Width20 in. / 50.8 cmCutting Heights1.2 in. – 2.4 in. / 30 mm – 61 mmHeight Control9-position manual height adjustmentGrass Catcher Capacity8.5 gal / 32 LFront Wheel Size10 in. / 25 cmRear Wheel Size6 in. / 15 cmFeaturesPush mower, lightweight, 9 height positions, rugged all-terrain wheels, 5 steel bladesFoldable HandleYesProduct Dimensions48 in. D x 26.6 in. W x 50.4 in. HNet Weight30.4 lbs / 13.8 kgWhat's in the BoxIncluded ItemMJ502MReel mower body✔Upper handle✔Middle handle bars✔ 2Lower handle✔Handle knob and bolt sets✔ 6Grass catcher✔Hex wrench✔Paper test strips✔ 20Manual✔Assembly🚫 Handle the reel mower carefully during assembly. The steel blades are sharp even though the mower has no motor. Keep hands, fingers, and feet away from the reel and cutting area.1Step 1Attach the two middle handle bars to the upper handle.›2Step 2Attach the upper and middle handle assembly to the lower handle.›3Step 3Fit the lower handle arms over the mower body posts.›4Step 4Hook and strap the grass catcher into position.Build the upper handle sectionSecure the two middle handle bars to the upper handle using the first set of knobs and bolts. Do not fully tighten the knobs until assembly is complete.Attach the lower handleAttach the upper and middle handle assembly to the lower handle using the remaining knobs and bolts. Tighten the knobs on each side for a secure fit.Attach the handle to the mower bodyLine up the holes at the lower end of each handle arm with the short posts on the side plates of the mower base. Pull both sides of the lower handle over the posts and press inward to ensure a secure fit.Attach the grass catcherHook the pre-assembled grass catcher onto the mower body by connecting the hooks to both ends of the steel shaft.Adjust the grass catcher strapSecure the locking strap on the grass catcher to the center bar on the lower handle. Adjust the strap so the grass catcher does not rub against the ground while mowing or transporting.Getting StartedInspect the lawnClear the mowing area of rocks, wire, toys, sticks, and other objects that could be thrown by the reel blades.Check mowing conditionsDo not mow wet grass. Wear proper footwear, avoid sandals or bare feet, and use eye protection while operating.Set the cutting heightMove the 9-position height adjustment levers to the desired setting. The levers are located next to the smaller rear wheels.Set both sides evenlyBoth height adjustment levers must be set to the same position before mowing.Use the highest setting for tall grassFor extremely tall grass, start with the highest cutting position for the first pass, then reset to the desired height and mow again.Push at a steady walking paceWalk behind the mower and maintain proper footing and balance. Do not run.Follow the cut path indicatorAlign the cutting path indication arrow with the previously cut path. Do not use the wheels as the grass cut line reference.⚠️ 1/3 rule: For a healthy lawn, avoid removing more than one-third of the total grass height in one mowing session and never more than 1 inch at a time.🚫 Slope safety: Mow across the face of slopes, never up and down. Do not mow wet grass, excessively steep slopes, near drop-offs, ditches, or embankments.Ensuring a Clean Cut🚫 The steel blades are extremely sharp. Do not touch the blades while making adjustments. Wrap the blades or wear gloves when handling near the reel.Place mower on a flat surfaceRemove the handles and grass catcher, then turn the mower reel upside down to expose the cutting bar.Insert a paper test stripPlace one of the supplied paper strips between the cutting bar and reel blades, then slowly turn the wheel by hand.Check the cutAll blades should slice the paper evenly along the entire length of the cutting bar while the reel turns smoothly.Adjust if cutting is intermittentEach end of the cutting bar can be adjusted separately. Adjust the side that cuts intermittently until the mower slices the paper evenly.Adjusting the Mower BladesFind the adjustment boltsThe two adjustment bolts are located at the back of the mower. They move the cutting bar closer to or farther away from the reel blades.Loosen the blades if the mower is hard to pushUse the included hex wrench and turn both adjustment screws by an equal amount counterclockwise.Tighten the blades if the mower does not cut cleanlyTurn both adjustment screws by an equal amount clockwise until the paper test shows clean cuts across the cutting bar.Do not overtightenBoth screws should be tight during final adjustment, but overtightening can damage the cutting bar.Mowing Tips1Mow regularlyMow at least once a week during the growing season for best results.2Use incremental cutting for tall grassIf grass is extremely tall, mow first at the maximum height setting. Then reset to the desired height and mow a second or third time.3Do not overload the lawn with clippingsDo not cover the grass surface with a heavy layer of clippings. Use the grass catcher or consider composting clippings.4Cut tall weeds oftenManual reel mowers can have difficulty cutting tall weeds such as dandelions and may bend them instead of cutting them. Cut often to prevent this.Maintenance & Care🚫 Keep hands and feet away from the cutting area. The reel blades rotate when the wheels turn and are sharp enough to cause serious injury.1Keep the mowing area clearTo avoid damage to the mower or blades, keep the lawn free from debris before mowing.2Lubricate regularlyFor best results, regularly apply lubricant to the cutting surfaces, cutting reel axle shaft, and wheels.3Keep the cutting bar adjustedUse the paper test to check for clean cutting and adjust the cutting bar only as needed.4Sharpen when neededUse lapping compound on the front edge of the reel blades and adjust the cutting bar so the blades have light but firm contact across the full width.5Clean before storageClean the exterior thoroughly with a soft brush and cloth. Do not use water, solvents, or polishes.6Clean the blade area safelyTurn the mower on its side and use a wood or plastic cleaning tool to remove compacted grass from the blade area. Do not place hands inside or near the cutting area.7Store dryStore the mower in a dry place and do not place other objects on top of it during storage.Troubleshooting GuideOnly perform the checks below. Keep hands, fingers, and feet away from the reel and cutting area.🟡 Mower Is Hard or Heavy to PushPossible CauseBlades are adjusted too tight against the cutting barGrass is too tall or cutting height is set too lowDebris is caught in the blade areaSolutionsUse the hex wrench to turn both adjustment screws equally counterclockwiseRaise the cutting height for the first passRemove debris with a wood or plastic cleaning tool; never use hands🟡 Cut Is Rough or UnevenPossible CauseBlades are misalignedOne side is tighter than the otherSolutionsRun the paper strip testInsert a strip between the cutting bar and reel bladesSlowly turn the wheel by handAdjust the side that cuts intermittently🟡 Grass Bends Instead of CuttingPossible CausesBlades are dull or too looseGrass is too tallTall weeds, such as dandelions, are bending under the reelSolutionsTighten both adjustment screws equally clockwiseIf dull, sharpen with 100–240 grit lapping compoundFor grass over 4 inches, remove excess turf mass before mowing normallyMow more frequently to prevent tall weed growth🟡 Mower Will Not Cut at AllPossible CauseBlades are too looseNo contact between reel and cutting barSolutionsTighten both adjustment screws clockwise by equal amountsRepeat the paper strip testContinue adjusting until paper cuts cleanly across the full bar width🟡 Streaks of Uncut GrassPossible CauseHeight levers are set to different positions on each sideSolutionCheck both height adjustment leversConfirm both levers are set to the same position before mowing🟡 Grass Catcher Drags on the GroundPossible CauseLocking strap is too looseSolutionRe-adjust the locking strapSet the grass catcher so it rides level and clears the ground during mowing and transport🟡 Handles Wobble or Feel LoosePossible CauseHandle knobs were not fully tightened after assemblySolutionCheck and fully tighten all 6 handle knobsConfirm the lower handle is securely fitted over the mower body posts🟡 Grinding or Scraping Noise During UsePossible CausesDebris is in the blade areaBlades are overtightenedSolutionsStop immediatelyTilt mower on its sideRemove debris with a wood or plastic tool; never use handsIf noise remains, back off both adjustment screws slightly🟡 Hard to Push After SharpeningPossible CauseLapping compound residue was not cleaned from the bladesSolutionClean all compound and debris from the cutting bar blade, reel blades, pinions, and pawls before useVideo GuideFrequently Asked QuestionsWhat comes with the MJ502M?The MJ502M includes the reel mower body, upper handle, two middle handle bars, lower handle, six handle knob and bolt sets, grass catcher, hex wrench, 20 paper test strips, and manual.Does the MJ502M need gas, oil, electricity, or batteries?No. The MJ502M is a manual, human-powered reel mower. There is no gas, no cord, no battery, no oil changes, and no spark plug.How wide is the cutting path?The MJ502M has a 20-inch cutting width. The manual notes that the actual cut line should be based on the cutting path indication arrow, not the mower wheels.What cutting heights are available?The MJ502M has 9-position manual height adjustment from 1.2 inches to 2.4 inches. Both height adjustment levers must be set to the same position before mowing.Can I mow wet grass?No. It's not advisable to mow wet grass because it can be slippery and may increase the risk of slipping or falling.How do I check if the mower is cutting properly?Use the included paper test strips. Insert a paper strip between the cutting bar and reel blades, then turn the wheel by hand. The blades should slice the paper evenly along the full length of the cutting bar.What replacement parts are listed for this model?The current Shop Joe product page lists the MJ501M-BAG replacement grass catcher bag for MJ501M/MJ502M lawn mowers and the MJ501M-HP hardware pack for MJ501M/MJ502M/MJ504M manual lawn mowers.How should I store the mower?Clean the mower with a soft brush and cloth, remove compacted grass from the blade area using a wood or plastic tool, and store the mower in a dry place. Do not place other objects on top of it during storage.