Mowing With a Reel Mower: Setup, Technique, and Maintenance Guide

The Mechanics of the Scissor Cut

Unlike rotary mowers that rely on high-speed horizontal impact to tear grass blades, mowing with a reel mower utilizes a precise scissor-action. As the helical cylinder blades spin, they trap the grass against a stationary bottom plate known as the bedknife. This clean shearing action seals the grass blade tip instantly, retaining moisture and drastically reducing the entry points for turf diseases like brown patch and dollar spot. According to turfgrass research from the University of Georgia Extension, this scissor cut promotes denser lateral growth, making reel mowers the undisputed standard for golf greens, sports fields, and premium residential lawns.

However, this mechanical advantage comes with strict operational requirements. A reel mower will not mulch tall, overgrown weeds, and it will scalp uneven terrain if not properly calibrated. Success requires mastering three distinct phases: equipment selection, precise bedknife calibration, and disciplined pushing technique.

Selecting the Right Reel Mower for Your Turf

Not all manual reel mowers are engineered for the same grass species. The number of blades on the cylinder (ranging from 4 to 8) dictates the "clip rate"—the distance the mower travels forward between each blade strike. A higher clip rate (more blades) is mandatory for lower cutting heights to prevent a "washboard" or ribbed appearance on the lawn.

Calibrating Cutting Height and Bedknife Clearance

The most critical step in mowing with a reel mower is setting the bedknife-to-reel clearance. If the blades touch the bedknife with a metallic clicking sound, you will rapidly dull both the cylinder and the bottom plate, rendering the mower useless within a few hours. If the gap is too wide, the grass will fold over and tear rather than cut.

The Paper Test Procedure

To achieve the exact factory tolerance, perform the paper test using a standard sheet of newspaper (approximately 0.003 inches thick).

1. Disengage the Drive: Lift the mower onto a workbench or flip it carefully so the wheels can spin freely without engaging the drive gears.
2. Locate Adjustment Bolts: Find the two adjustment nuts on either side of the reel bearing. These control the lateral position of the cylinder relative to the bedknife.
3. Adjust to Contact: Turn the nuts counter-clockwise until the reel blades lightly touch the bedknife. You will hear a faint, uniform ticking sound as the reel spins.
4. Back Off Slightly: Turn the nuts clockwise by exactly one-quarter turn on both sides. This creates a microscopic gap (roughly 0.001 to 0.002 inches).
5. Execute the Paper Test: Spin the reel backward (counter-clockwise) by hand. Slide a 1-inch wide strip of newspaper between the bedknife and the spinning blades at the left, center, and right sides of the cylinder.
6. Verify the Cut: The reel should cleanly shear the paper with a crisp snipping sound across the entire width. If the paper crumples or pulls, the gap is too wide on that side. If the paper won't feed, the gap is too tight.

Proper Pushing Technique and Overlap Patterns

Rotary mowers can be pushed erratically because the high-speed blade creates a vacuum that pulls grass in from all directions. Reel mowers require deliberate, linear momentum. According to the University of Minnesota Extension, consistent mowing patterns prevent soil compaction and grain formation (where grass leans in one direction).

• Maintain Momentum: A manual reel mower requires a brisk, steady walking pace of about 3 to 4 mph. Walking too slowly allows the cylinder to bog down in dense turf; walking too fast causes the wheels to slip, resulting in an uneven clip.
• The 20% Overlap Rule: Always overlap your previous mowing pass by 20% to 30% (roughly 4 to 5 inches on a 20-inch mower). This ensures no uncut strips are left behind due to wheel rut deflection.
• Alternate Directions Weekly: Mow north-to-south one week, and east-to-west the next. This stands the grass blades up straight and prevents the formation of a permanent "grain" that causes the ball to roll unpredictably on highly manicured lawns.

Blade Maintenance: Backlapping vs. Professional Grinding

Even with perfect adjustment, the cutting edges of a reel mower will eventually round over from friction and microscopic silica deposits in the grass. When the paper test fails despite correct clearance, the blades require sharpening. You have two options: professional grinding or DIY backlapping.

Understanding Backlapping

Backlapping is a friction-sharpening process that uses an abrasive compound to hone the mating surfaces of the reel blades and the bedknife simultaneously. It is highly effective for routine maintenance but cannot fix severely nicked, bent, or heavily dulled blades (which require professional spin-grinding, typically costing $50 to $85 at a specialized turf equipment dealer).

Step-by-Step Backlapping Procedure

For routine home maintenance, perform backlapping every 25 to 30 hours of mowing time.

1. Secure the Mower: Elevate the mower so the drive wheels are off the ground. Block the wheels to prevent accidental spinning.
2. Apply Lapping Compound: Using a stiff-bristled brush, apply a generous coat of 80-grit silicon carbide lapping compound (such as Cloverleaf or Danco) to the entire length of the bedknife. Do not use automotive valve grinding compound, as the grit size is inconsistent and can pit the steel.
3. Spin in Reverse: Attach the backlapping crank handle (included with most premium mowers) or use a low-speed drill (under 300 RPM) attached to the reel shaft. Spin the reel backward (opposite its normal mowing direction) for 3 to 5 minutes. Spinning backward prevents the compound from being thrown off and ensures the abrasive cuts into the correct bevel angles.
4. Inspect and Clean: Wipe the blades clean with a rag and mineral spirits. Perform the paper test. If the paper still crumples, repeat the process.
5. Finishing Pass: For a razor-sharp edge, wipe out the 80-grit compound and apply a 120-grit or 150-grit finishing compound. Spin backward for another 2 minutes, then clean thoroughly and apply a light coat of 3-in-One oil to prevent flash rusting.

Frequently Asked Questions

Why is my reel mower leaving uncut strips of grass in the middle of the pass?

This is known as "ribboning" and is almost always caused by a dull cylinder or a bedknife that is pitched at the wrong angle. If the front edge of the bedknife is tilted too far down, the grass is pushed away before the reel can catch it. Check your owner's manual for the specific bedknife pitch adjustment (usually a 10 to 15-degree downward slope from horizontal).

Can I mow wet grass with a reel mower?

While reel mowers handle damp morning dew better than rotary mowers (which tend to clump and clog the deck), mowing heavily saturated grass is not recommended. Wet grass blades are highly pliable and will bend away from the scissor-action rather than being sheared, resulting in a ragged, torn appearance that invites fungal pathogens.

How often should I adjust the cutting height?

Follow the "one-third rule." Never remove more than one-third of the total leaf blade in a single mowing. If your target height is 1.5 inches, you must mow when the grass reaches 2.25 inches. During peak spring growth, this may require mowing every 3 to 4 days, while summer dormancy may stretch intervals to 10 days.