Lawn Care
Sun Joe Reel Lawn Mower: Selection, Setup, and Maintenance
The Case for Manual: Why Choose a Sun Joe Reel Mower?
Manual reel mowers have transitioned from nostalgic novelties to serious turf management tools for eco-conscious homeowners. Unlike rotary mowers that tear grass with a single high-speed horizontal blade, reel mowers utilize a scissor-action cutting mechanism. A spinning cylinder of blades (the reel) sweeps the grass against a fixed bottom blade (the bedknife), shearing it cleanly. This clean cut reduces moisture loss and minimizes the entry points for turf diseases, a principle heavily emphasized by NC State University’s Turfgrass Science program.
Sun Joe offers some of the most accessible entry points into manual mowing, specifically with their MJ501M and MJ500M models. However, a reel mower is not a drop-in replacement for a gas-powered rotary. It requires specific lawn conditions, precise mechanical calibration, and a proactive maintenance routine. This guide breaks down exactly how to select, set up, and maintain a Sun Joe reel lawn mower for optimal performance.
Model Selection: MJ501M vs. MJ500M
Choosing the right Sun Joe reel lawn mower depends on your yard's square footage, topography, and your physical stride. Both models feature a 5-blade cutting reel and a cutting height range of 1.25 to 2.5 inches, but their footprint and weight dictate their ideal use cases.
| Feature | Sun Joe MJ501M (18-Inch) | Sun Joe MJ500M (16-Inch) |
|---|---|---|
| Cutting Width | 18 inches | 16 inches |
| Weight | ~34 lbs | ~30 lbs |
| Blade Count | 5-Blade Ball Bearing Reel | 5-Blade Ball Bearing Reel |
| Ideal Lawn Size | Up to 5,000 sq. ft. | Up to 3,000 sq. ft. |
| Current Avg. Price | $115 - $135 | $95 - $115 |
| Maneuverability | Moderate (requires wider turns) | High (excellent for tight garden beds) |
Selection Verdict: If your lawn is flat, relatively open, and approaches 4,000 to 5,000 square feet, the MJ501M’s 18-inch deck will save you significant time and overlapping passes. If your yard features narrow pathways, tight corners around landscaping, or is under 3,000 square feet, the lighter, narrower MJ500M will reduce fatigue and prevent the wheels from dragging over your flowerbed edges.
Lawn Preparation and Ideal Turf Conditions
Reel mowers do not generate the suction that rotary mowers use to stand grass up before cutting. They rely on the forward momentum of the mower to push the grass into the bedknife. Because of this, lawn preparation is non-negotiable.
⚠️ Critical Warning: The Wet Grass Rule
Never use a Sun Joe reel mower on wet grass. Moisture causes grass blades to clump and lay flat, causing the reel to push the turf over rather than cut it. Furthermore, wet clippings will pack tightly into the cutting cylinder, jamming the gears and accelerating rust on the bedknife.
Ideal Grass Types for Reel Mowing
- Bermudagrass & Zoysia: These warm-season grasses thrive when cut short (1 to 1.5 inches) and possess the rigid blade structure that reel mowers shear perfectly.
- Kentucky Bluegrass & Fescue: Cool-season grasses can be reel-mowed effectively, provided you maintain the cutting height at the higher end of the Sun Joe’s range (2 to 2.5 inches) to prevent scalping.
Pre-Mow Site Clearance
Unlike rotary mowers that can mulch small twigs or bounce over pinecones, a reel mower will instantly jam if a stick enters the cutting chamber. Before every mow, walk the lawn with a flexible leaf rake or a push broom to clear debris, stones, and exposed roots. According to the University of Minnesota Extension, removing physical obstacles not only protects mower blades but also prevents the spread of fungal spores trapped in decaying wood matter.
Precision Blade Calibration: The Paper Test
The most common reason new Sun Joe reel mower owners abandon their equipment is poor factory calibration. If the gap between the spinning reel and the stationary bedknife exceeds 0.003 inches, the mower will fold the grass over instead of cutting it, leaving your lawn with frayed, white tips. You must calibrate the bedknife before your first use and after every 10 hours of mowing.
Step-by-Step Bedknife Adjustment
- Secure the Mower: Tip the Sun Joe mower backward onto its handle, resting on a soft surface like a cardboard box or old towel to prevent scratching the reel.
- Loosen the Bedknife Screws: Locate the two main horizontal bolts securing the bedknife to the side plates. Loosen them just enough to allow the bedknife to pivot (about a half-turn counter-clockwise).
- Adjust the Contact Screws: On the outside of each wheel, you will find smaller adjustment screws that push the bedknife upward toward the reel. Turn these screws clockwise in micro-increments (quarter-turns).
- Perform the Paper Test: Take a standard piece of 20lb printer paper. Slide it between the reel and the bedknife while slowly rotating the reel backward by hand. The paper should be snipped cleanly with a crisp "snick" sound across the entire width of the blade.
- Eliminate Binding: If the reel feels stiff to turn or makes a metallic scraping sound, the bedknife is too tight. Back off the adjustment screws slightly until the paper cuts cleanly but the reel spins freely.
- Lock it Down: Once the paper test is successful across all five blades, tighten the main horizontal bedknife bolts to lock the calibration in place.
Essential Maintenance: Backlapping and Rust Prevention
Even with perfect calibration, the cutting edges will eventually dull from microscopic silica particles in the grass blades. Sharpening a reel mower requires a process called "backlapping," which uses an abrasive compound to hone the mating surfaces of the reel and bedknife simultaneously.
How to Backlap a Sun Joe Reel
Purchase a standard valve grinding compound (available at any auto parts store for under $8) and a backlapping brush. Apply a thin, even bead of the compound to the bedknife. Using a socket wrench or a specialized backlapping crank, spin the reel backward (opposite to its normal mowing direction). The backward friction grinds the abrasive between the reel and bedknife, honing both edges perfectly parallel. After 3 to 5 minutes of spinning, wash the cylinder thoroughly with a garden hose and a stiff nylon brush to remove all abrasive residue. Failure to remove the compound will result in severe gear wear.
Rust Mitigation Strategy
Sun Joe mower blades are made of carbon steel, which holds an edge well but is highly susceptible to oxidation. After every use and wash, dry the reel completely with a microfiber cloth. Spray the cutting cylinder and bedknife with a dry PTFE (Teflon) lubricant. Avoid standard WD-40 or wet oils; they attract grass dust and grit, creating a grinding paste that accelerates wear on the wheel bearings and gears.
Troubleshooting Common Sun Joe Reel Issues
Diagnostic Matrix
Symptom: Mower leaves uncut strips of grass in the center of the path.
Cause: Overlapping wheel tracks or walking too fast, causing the reel RPM to drop below the threshold needed to sweep the grass.
Fix: Slow your walking pace to allow the gears to multiply wheel rotation into reel rotation. Ensure you overlap your previous mow line by at least 2 inches.
Symptom: Grass tips look white, shredded, or bruised a day after mowing.
Cause: The bedknife gap is too wide, tearing the grass rather than shearing it, or the blades are dull.
Fix: Recalibrate using the paper test. If the paper test passes but grass still tears, perform a backlapping session.
Symptom: The mower requires excessive physical force to push forward.
Cause: The cutting height is set too low, causing the bedknife to scrape the soil, or the wheel bearings are seized.
Fix: Adjust the roller height to a minimum of 1.5 inches. Apply PTFE spray to the wheel axle points. If the soil is uneven, consider lawn leveling with topdressing sand before lowering the cutting height.
Expert Verdict: Is the Sweat Equity Worth It?
A Sun Joe reel lawn mower is an exceptional tool, provided you respect its mechanical limitations. It will not conquer a neglected, weed-choked half-acre, nor will it function in damp conditions. However, for homeowners with flat, well-maintained lawns under 5,000 square feet, the MJ501M and MJ500M deliver a superior, turf-healthy scissor cut that rotary mowers simply cannot replicate. By committing to 10 minutes of post-mow cleaning and bi-annual backlapping, your Sun Joe reel mower will operate silently, emission-free, and effectively for decades.
