What Is a Push Reel Mower’s Cutting Reel (Bedknife Gap Specs)
A push reel mower’s cutting reel is the set of spinning blades that passes a fixed blade, called the bedknife, to shear grass cleanly. The right spacing is model-specific: there is no universal bedknife-gap measurement. Follow your mower’s manual, check for a clean paper cut across the reel, and make sure the reel turns freely without binding.
Imagine you find “adjust the bedknife gap” in your mower manual. You may wonder whether the blades should touch, or how many thousandths of an inch should separate them. The safe answer is not one number for every mower: the design and adjustment method vary.
I explain the cutting reel as two edges working together. Understanding those parts, and checking them in the right order, helps you spot a poor cut without guessing at a setting.
Equipment Setup and Safety Preparation
The cutting reel is the rotating cylinder of helical blades at the front of a push reel mower. The bedknife is the fixed edge beneath it. Their edges work like scissors: a reel blade passes close to the bedknife and shears grass between them. The setting depends on the mower’s design and manual.
What the reel and bedknife do
The reel’s curved blades rotate as you push the mower. Each blade passes the bedknife, which stays in place and provides the second cutting edge. A clean cut depends on the edges being straight, aligned, and set according to the manufacturer’s instructions.
The space between those edges is often called the reel-to-bedknife clearance or bedknife gap. Some designs allow very light, even contact. Others call for minimal clearance. Neither condition should be assumed for a mower whose manual has not been checked.
A gap that is too wide can let grass bend or slip between the blades, leading to missed, torn, or unevenly cut grass. Too much contact can create drag, speed up wear, or make the reel bind.
Before you inspect or adjust
Start with the mower on a stable surface. Wear sturdy footwear and eye protection, and clear the area around the mower of stones, sticks, wire, and other debris. Keep your hands, loose clothing, and tools away from the cutting edges.
Before adjusting anything, find the owner’s manual or the manufacturer’s instructions for your model. Adjustment points and methods differ. Do not turn adjustment screws by guesswork or use a generic gap measurement from another mower.
Check that the wheels, reel, bedknife, and visible fasteners are not damaged or loose. If a part looks bent, cracked, or out of place, stop and check the manual or contact the manufacturer before mowing.
Key takeaway: Identify the mower’s model and adjustment method before trying to set the clearance.
Reel-to-Bedknife Adjustment and Field Mowing
Reel adjustment means setting the rotating blades and fixed bedknife so they cut grass cleanly without excessive drag. Use the manufacturer’s procedure, then check the cut at several places across the reel. The reel should turn by hand without hard spots, scraping, or unusually heavy resistance.
How to check the cutting action
If the manual permits a paper test, secure the mower as directed and use the method it specifies to turn the reel. Keep your hands away from the cutting edges; use the wheel or other safe turning point identified in the instructions. Feed a strip of paper between the reel and bedknife at several points across the blade width.
A good result is a clean, consistent cut across the width, not a strip that tears in one area and cuts in another. A paper test is a simple check, not a replacement for the mower’s adjustment instructions. If the mower’s manual gives a different test, follow that procedure.
Check how the reel rotates as well. It should move freely and evenly by hand, without a hard spot, scraping, or excessive drag. Slight, even contact may be normal on some designs, but do not treat it as universal. If the manual is unclear, ask the manufacturer for the correct setting.
| What you notice | What it may mean | What to do |
|---|---|---|
| Paper cuts cleanly at several points; reel turns evenly | Cutting edges may be set consistently | Confirm the manual’s test and mow a small area |
| Paper tears or misses in one area | Gap or alignment may vary across the width; edges may also be worn | Stop and follow the model’s adjustment procedure |
| Reel scrapes or has a hard spot | Excessive contact, misalignment, or damage is possible | Stop; do not force the reel or widen the gap at random |
| Reel turns freely, but grass tears | Dull or damaged edges, unsuitable grass conditions, or a setting issue may be involved | Inspect the edges and consult the manual |
Set cutting height and mow
Cutting height is the height at which the mower leaves the grass. Set it within the range marked on your mower and use its stated adjustment steps; height ranges and increments vary by model. Changing height does not correct a poor reel-to-bedknife setting.
Where practical, mow dry grass. Use steady passes that overlap slightly so narrow strips are less likely to be missed. If clippings clog the mower, stop and wait until it is stationary. Keep your hands away from the reel while clearing them.
A common adjustment mistake is to respond to drag by opening the gap without checking alignment. An uneven setting can make one end contact heavily while the other end has too much clearance. If resistance appears suddenly, stop; do not force the mower through it.
Key takeaway: Test across the full blade width, and stop if the reel binds or resists unevenly.
Inspection, Sharpening, and Alignment
Inspection checks whether the reel blades and bedknife are straight, secure, and aligned. Sharpening restores a cutting edge when it is dull or damaged, but the correct method depends on the mower. Backlapping is one possible sharpening method; it is not a universal fix or a substitute for proper alignment.
Check the edges and alignment
Look for visible bends, chips, rust, or loose parts on the reel and bedknife. The cutting edges should be straight and aligned with each other. A paper test that succeeds in one spot but fails elsewhere may point to uneven adjustment, worn edges, or damage; the test alone cannot identify which one.
Adjustment must keep the reel and bedknife properly aligned across their width. If one end touches heavily, the reel may bind or wear quickly. Stop using the mower and follow the manual’s realignment steps. Do not force the reel, or try to solve uneven contact by arbitrarily widening the gap.
Sharpen only by the model’s procedure
A dull reel-and-bedknife pair may crush or tear grass instead of shearing it. Sharpening and backlapping procedures vary, so follow the mower maker’s instructions. If you cannot confirm the correct procedure, have a qualified service provider inspect the cutting unit.
A blade that is damaged, badly worn, or out of alignment may need more than sharpening. Avoid using the mower until the cause is clear. A correct adjustment cannot restore a bent or damaged cutting edge.
Key takeaway: Treat uneven contact as an alignment problem to investigate, not a reason to guess at a wider gap.
Cleaning and Seasonal Storage
Cleaning removes grass and debris that can hide damage or interfere with inspection. After mowing, make sure the mower is stationary and keep your hands clear of the reel. Brush away loose material, check for new damage or loose parts, and use lubricant only where the manufacturer specifies.
After each mowing
Use a brush to clear grass and debris from accessible areas. Do not reach into the reel. If material is caught near the blades, stop the mower and follow the manual’s safe clearing instructions.
Once it is clean, look over the reel, bedknife, wheels, and fasteners. If you notice damage or a part has loosened, address it before the next mowing session. Apply lubrication only to points named in the manual; excess or misplaced lubricant can attract debris or affect parts.
Before storing the mower
Store the mower dry, following the maker’s guidance for your model. Before using it again, inspect the cutting edges and fasteners, then repeat the paper and free-rotation checks if the manual recommends them. Do not assume the adjustment remains correct after damage, service, or a long period in storage.
Key takeaway: Keep the cutting unit clean and dry, and use only the lubrication points listed for your mower.
Conclusion
The cutting reel and bedknife form a scissor-like cutting pair. Their correct clearance is specific to the mower, so there is no reliable universal gap number to apply. Use the manual, check the paper cut across the reel, and stop if the reel binds or has uneven contact.
Frequently Asked Questions
These answers cover common questions about reel blades, bedknife clearance, and basic checks. Use them as a starting point, not as a replacement for the instructions supplied with your mower. When a model’s procedure differs from a general check, the manufacturer’s procedure takes priority.
Should the reel blades touch the bedknife?
Some mower designs allow very light, even contact, while others require minimal clearance. Check your manual rather than assuming the blades should touch or remain apart. The reel should still turn freely without hard spots or excessive drag.
What is the correct bedknife gap in thousandths of an inch?
There is no universal measurement for push reel mowers. The correct clearance depends on the mower’s design and adjustment procedure. Use the maker’s stated setting, and do not copy a number from a different model.
How do I know if the reel is set correctly?
Use the manufacturer’s check. If it calls for a paper test, the paper should cut cleanly and consistently at several points across the reel. The reel should also turn by hand without binding, hard spots, or excessive drag.
What does a paper test tell me?
A paper test checks whether the reel and bedknife cut consistently across the blade width. A torn or uncut section can signal uneven adjustment, worn edges, or damage. It does not, on its own, tell you which cause is responsible.
Why does my push reel mower tear grass?
A wide or uneven clearance, dull or damaged edges, or another setup issue may contribute to tearing. Check the mower’s adjustment instructions and inspect the cutting edges. Do not assume sharpening alone will fix the problem.
What should I do if the reel binds?
Stop using the mower. Do not force it or widen the gap at random. Uneven contact, misalignment, or damage may be involved. Follow the model’s realignment procedure or ask a qualified service provider to inspect it.
Can I adjust any push reel mower the same way?
No. Adjustment mechanisms and settings vary by model. Use the manual for your specific mower, and avoid turning screws unless the instructions identify them and explain the adjustment.
How often should I sharpen a reel mower?
There is no single schedule that fits every mower or use pattern. Inspect the edges and follow the manufacturer’s guidance. If the mower tears grass or the edges look damaged, check its adjustment and condition before deciding whether sharpening is needed.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
