The DeWalt DW33 is a 21-inch self-propelled gas lawn mower featuring a 190cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment (1.5-4 inches), 2.1 bushel rear bag, electric start with backup recoil, variable speed self-propulsion, and durable steel deck. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.
Key components: 21-inch steel cutting deck, 190cc Briggs & Stratton engine, rear collection bag, single-lever height adjuster, electric start key, self-propulsion drive control.
| Feature | Description |
|---|---|
| Engine | 190cc Briggs & Stratton 4-cycle OHV engine |
| Cutting Width | 21 inches |
| Cutting Height | Single-lever adjustment (1.5" to 4") |
| Drive System | Variable speed self-propulsion (front-wheel drive) |
| Starting System | Electric start with backup recoil |
| Discharge Options | Mulch, Bag, Side-discharge (3-in-1) |
| Bag Capacity | 2.1 bushels (rear bag) |
| Deck Material | Powder-coated steel |
| Wheels | 8-inch rear, 7-inch front |
| Fuel Tank | 1.1 quarts (unleaded gasoline only) |
Unpack and inspect all parts. Assembly requires basic tools (included).
WARNING! Do not add fuel indoors or near ignition sources. Ensure all bolts are tight before operation.
Before first use, complete assembly and perform pre-operation checks.
CAUTION! Always start mower outdoors. Keep hands and feet clear of moving parts.
Handle Controls: Drive control lever, height adjustment lever, electric start key slot, recoil starter handle.
Starting Procedure:
Operation: Squeeze drive control lever to engage self-propulsion; release to stop. Adjust speed with throttle control. To stop engine, turn key to OFF.
Single-lever adjustment for all four wheels simultaneously.
Tip: For healthier grass, never cut more than 1/3 of grass height at one time. Adjust height seasonally.
Configure for mulching, bagging, or side-discharge.
WARNING! Always stop engine before changing discharge configuration. Ensure all parts are securely installed.
| Maintenance | Frequency |
|---|---|
| Check oil level | Before each use |
| Check air filter | Every 25 hours |
| Replace spark plug | Every 100 hours |
| Change oil | First 5 hours, then every 50 hours |
| Sharpen/replace blade | Every 25 hours or as needed |
| Clean under deck | After each use (when cool) |
| Check tire pressure | Monthly |
| Lubricate wheels | Every season |
For long-term storage (over 30 days):
CAUTION! Never store mower with fuel in tank indoors or in enclosed spaces without proper stabilization.
Always: Read manual before operation. Wear eye protection and sturdy shoes. Clear mowing area of debris. Mow in daylight only. Keep children and pets away.
Never: Operate on slopes greater than 15 degrees. Mow wet grass. Remove safety devices or guards. Put hands or feet near moving parts. Allow children to operate.
Emergency stop: Release drive control lever and turn key to OFF immediately.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | No fuel, bad spark plug, stale fuel | Check fuel level; replace spark plug; drain old fuel. |
| Poor cutting performance | Dull blade, low engine speed | Sharpen or replace blade; check throttle setting. |
| Self-propulsion not working | Drive belt loose, control cable | Check drive belt tension; inspect control cable. |
| Excessive vibration | Bent blade, loose parts | Stop engine immediately. Check blade balance and tightness. |
| Grass clumping | Wet grass, cutting too low | Mow when grass is dry; raise cutting height. |
| Electric start not working | Dead battery, loose connection | Charge battery; check wiring connections. |
Service: For repairs, contact authorized DeWalt service center. Do not attempt major repairs unless qualified.
Support: 1-800-433-9258; www.dewalt.com