Commercial Mowing Operations

A commercial mower is one of the fastest and most dangerous machines in the landscape trade. Its blades can throw a rock across a parking lot, and it can tip on a slope in a second. It is also what makes a crew productive. A good operator checks the machine before starting, keeps blades sharp, and reads the property. The finish work, the trimming, the edging, and the blowing, is what customers actually notice. A sharp edge makes an average cut look professional.

What You Will Be Able to Do

• Do a daily pre-operation check on a commercial mower
• Operate a zero-turn safely, including on slopes
• Choose, sharpen, and balance blades
• Mow in patterns that protect turf and look professional
• Trim, edge, and blow a property the right way

Choosing the Machine

Daily Pre-Operation Check

Do this with the engine off and cool.

1. Engine oil: Check the level.
2. Fuel: Top off the tank before you start, with the engine cool.
3. Air filter: Check it daily or before each use during the mowing season. Dust from mowing clogs it fast.
4. Tire pressure: Use a gauge. Uneven pressure tilts the deck and leaves an uneven cut.
5. Blades: Look for sharp edges, cracks, and tight bolts.
6. Belts: Look for cracks or fraying.
7. Deck: Level side to side. Set the front about 1/8 to 1/4 inch lower than the back, so the blades cut once and the rear of the blade does not recut.
8. Safety switches: Test them. Seat switches and blade interlocks shut down the blades or engine when you leave the seat or do something unsafe.

Warning: Before you clear a jam or touch the deck, disengage the blades, shut off the engine, take out the key, and wait until everything stops. Never bypass a safety switch.

Operating a Zero-Turn

Two lap bars control speed and steering. Push both forward to go straight. Push one farther than the other to turn. Push them in opposite directions, one forward and one back, and the mower spins on the spot. That is the zero-radius turn.

Practice in an open area at low speed. Sudden moves tear up turf, and they can throw you off balance. Lift the blades or slow down on turns. Pivot gently on the turf, or use a three-point turn, to avoid leaving marks.

Slopes

Rollovers are one of the leading causes of death with mowers.

• Follow the manufacturer's slope limit. It is usually on a label on the machine or in the manual. Many are around 15 degrees.
• Riding mowers: Mow up and down, not across, if the slope is within the limit.
• Walk-behind mowers: Mow across the slope, side to side, so that you stay out of the mower's path if you slip.
• Keep the rollover bar up and use the seat belt. A rollover bar only works when it is raised, and you need the belt to stay inside its protection. Lower it only when necessary, as directed in the manual.
• Stay away from drop-offs. Ditches, ponds, and retaining walls can cause rollovers. Use a trimmer or a walk-behind near edges.
• Do not mow wet slopes. Wet grass reduces traction, and a mower can slide out of control.

If you are not sure about a slope, do not mow it with a rider. Walk it first, and use a machine rated for slopes or a trimmer.

Thrown Objects

Walk the property before you mow. Pick up rocks, sticks, cans, and toys. Aim the discharge away from people, cars, and windows. Stop the blades if anyone comes close. Keep bystanders at least 50 feet from mowers and trimmers.

Blades

A high-lift blade pulls more power and blows more dust in dry, sandy soil.

Sharpening

Sharpen commercial blades every 8 to 10 hours of use, which often means daily in peak season. A dull blade tears grass, and the ragged tips turn brown and are more likely to get diseases. A brown haze across the lawn a day or two after mowing is the warning sign.

1. Disconnect the spark plug or follow your machine's lockout steps.
2. Remove the blade, wearing cut-resistant gloves. Block the blade so it cannot turn.
3. Grind along the factory angle, removing the same amount from each end.
4. Check the balance on a blade balancer. An unbalanced blade shakes the deck and wears out bearings.
5. Replace any blade that is cracked, bent, or worn thin. A broken blade at full speed can be deadly.
6. Reinstall the blade and tighten it to the torque in the manual.

Most crews carry a sharp spare set so they can swap blades on the truck.

Mowing a Property

Timing

During hot weather, mow in the late afternoon or early evening when you can. Cutting during peak heat stresses the turf. Avoid mowing wet grass. It clumps, cuts poorly, and leaves ruts. In practice, routes run all day, so raise the deck during stressful weather.

Patterns

Change your pattern each visit. Repeating the same route wears ruts, compacts soil, and makes grass lean in one direction.

• Perimeter first: Make two passes around the edge, then fill in the middle. That gives you room to turn.
• Straight lines: Alternate direction on each visit.
• Diagonals: Good for a sharp look on visible properties.

Overlap each pass by a couple of inches so that no strips get missed.

Stripes

Stripes are made by bending grass in opposite directions. Blades bent away from you look lighter, and blades bent toward you look darker. A striping kit makes this stronger. It shows best on taller cool-season grass.

Clippings

Blow clippings back onto the turf or into beds. Do not send them into the street or storm drains. Clippings carry nutrients and sometimes pesticides into waterways.

Trimming

String trimmers reach where the mower cannot, around fences, posts, walls, and trees. Trimmer line can throw debris, so full protection is required: safety glasses or a face shield, hearing protection, long pants, closed-toe boots, and gloves.

• Keep the head level with the ground. Tilting it scalps the turf.
• Trim away from people, cars, and windows.
• Keep the line away from tree trunks. Repeated string contact strips bark and damages the living layer below it. This often kills young trees. A ring of mulch around the tree removes the need to trim there.

Edging

A clean edge along sidewalks and curbs is the single biggest visual difference between professional and amateur work. It defines where turf ends and hard surfaces begin.

Use a stick edger or a trimmer turned on its side. Cut straight down about 1 to 2 inches deep. Many crews edge before mowing, so the mower or blower takes care of the debris. Wear eye protection, because a stick edger can throw stones.

Blowing

Blowing is the last step. Clear sidewalks, entrances, drives, and parking areas. Clippings on concrete can stain, and they are a slip hazard.

Backpack blowers are the commercial standard because they move much more air. Blow toward turf or beds. Do not blow debris at people or cars, and keep the noise in mind. Many towns limit blower hours or have rules on gas blowers. Hearing protection is required.

Fuel and Transport

• Let the engine cool before refueling.
• Keep gasoline in approved cans. Fill cans on the ground, not in a truck bed.
• Stay away from sparks and cigarettes when fueling.
• Secure machines on the trailer with straps or chains. Check the hitch, safety chains, and lights.
• Load mowers carefully. Keep the ramps at the angle the manual allows. Many operators back up ramps, as the manual directs.

Quality Check Before You Leave

1. Walk the property the way a customer would.
2. Look for missed spots, uneven lines, and scalped areas.
3. Check that all hard surfaces are blown clean.
4. Close and latch all gates as you found them.
5. Pick up tools, trash, and anything else you brought.
6. Note any damage or problems, such as a broken sprinkler or a dead plant, to report.

On a crew, the mower operator and the trimmer should finish at about the same time, with blowing as the final step.

Common Mistakes

Check Your Understanding

1. One side of your cut is lower than the other, and you can see a step in each pass. What do you check first?

Tire pressure, then deck level. Uneven pressure tilts the deck.

2. How do you turn a zero-turn in place?

Push the lap bars in opposite directions, one forward and one back. Do this gently on turf, or you may tear it.

3. A slope on a property looks close to the limit of your rider, and it rained this morning. What do you do?

Do not mow it with the rider. Wet grass reduces traction. Come back when it is dry, or use a walk-behind or trimmer, and check the manufacturer's slope limit.

4. Your blades have about 9 hours on them, and you see brown tips on yesterday's lawn. What is going on?

The blades are dull and are tearing the grass. Swap them for a sharp set.

Key Takeaways

• Check oil, filter, tires, blades, and safety switches before every shift.
• Set the deck level, with the nose about 1/8 to 1/4 inch low.
• Follow the slope limit, keep the rollover bar up, and use the seat belt.
• Sharpen blades every 8 to 10 hours of use.
• Change your pattern each visit.
• Edge cleanly, keep string off trees, and blow debris onto turf or beds.