Automotive / Jump Starters
User Manual for Cobra Fortis 14L Lawn Mower
Comprehensive user guide for the Cobra Fortis 14L series lawn mower. Includes assembly, operation, maintenance, and troubleshooting instructions for the Fortis 14L, 17B, 20B, and 25B models.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The Cobra Fortis series is a petrol-powered cylinder lawn mower designed for home gardening and fine turf sports field environments. Before operating, ensure you are familiar with the controls and safety procedures. Warning: Never use the mower to trim hedges, shrubs, or as a power cultivator. Always wear substantial footwear and long trousers during operation. Keep bystanders and animals at a safe distance.
Parts Description
The mower features a throttle lever, upper and lower handles, drive and cylinder clutch levers, a grass box collector, front roller, cutting cylinder, and height of cut control. Refer to the parts diagram for specific locations of these components.
Assembly
Handlebar Assembly: Align the upper handle with the lower handle. Fit the quick-release lever with one washer on the outside and one on the inside of the handlebar. Secure with the nut and tighten using a 13mm spanner. Repeat for the other side.
Preparing for Use
Filling with Engine Oil: The mower is shipped with the oil drained. Ensure the mower is on level ground and fill the crankcase with SAE 30 Engine Oil to the top of the dipstick/filler cap, keeping the level between the upper and lower limits.
Filling with Petrol: Use unleaded fuel. Refuel outdoors only, with the engine stopped and cool. Do not smoke while refueling.
Grass Collector: Hook the base of the collector over the support studs on the mower body. The collector rests on the lower supports.
Operation
Starting Procedure: The starting process varies slightly between Loncin and Briggs & Stratton engines. Generally, move the fuel valve to 'ON', set the throttle to 1/3 towards 'FAST', move the choke to 'CLOSE' (for cold engines), and pull the starter grip until the engine starts. Gradually move the choke to 'OPEN' as the engine warms.
Mowing Controls: Engage the cutting cylinder by moving the cylinder control lever towards the handle. Engage the power drive by moving the drive control lever towards the handle.
Stopping: In an emergency, release both control levers. For a planned stop, move the throttle to 'SLOW', release the drive and cylinder levers, turn the engine switch to 'OFF', and turn the fuel valve to 'OFF'.
Maintenance and Adjustments
Height of Cut: Turn the height control knob clockwise to raise the cutting height and anti-clockwise to lower it.
Cylinder to Bottom Blade Gap: Loosen the bolts on both sides of the mower and the nuts on the adjustment screw. Turn the adjustment screw until the cylinder blade just makes contact with the bottom blade while still rotating freely. Re-tighten all nuts and bolts. Test with paper to ensure a clean cut.
Belt Adjustment: For the cylinder drive belt, remove the side cover, loosen the lock nut, and adjust cable tension until there is 5-6mm of movement in the belt. For the drive control, adjust the long bolt until the belt has 1-2mm of movement.
Lubrication: Regularly apply oil to the height of cut adjuster knob shaft and the inner shaft of the front roller.
Changing the Cartridge: The Fortis system supports 7 different cartridges. To change, remove the side cover, remove the cartridge securing bolts, remove the belt from the pulley, and lift out the cartridge. Reverse the process to fit a new one.
Troubleshooting
If the grass is not cut cleanly, check and adjust the cylinder-to-bottom-blade gap. If the engine has starting problems, it may be flooded; wait 10-15 minutes and reconnect the spark plug. If the power drive does not work, adjust the drive cable tension.
Technical Data
The series includes models Fortis 14L, 17B, 20B, and 25B with varying engine displacements (127cm³ to 196cm³) and blade widths (14in to 25in). All models feature a rated speed of 3600/min.
Manufacturer information
Cobra Electronics
Practical help
Common problems
Grass is not cleanly cut or is ripped
The cylinder to bottom blade gap is incorrect. Check and adjust the gap; sharpen the cylinder if necessary.
Engine starting problems
Engine may be flooded. Wait 10-15 minutes, ensure the spark plug lead is connected, and check if the spark plug is dirty.
Engine stops during operation
Check for no petrol, increase throttle speed if too low, or remove any obstruction from the cutting cylinder.
Power drive does not work
The drive cable is incorrectly adjusted or damaged. Adjust the drive cable tension.
Before use
- Check the oil level and add SAE 30 oil if required.
- Inspect all fixings (screws, nuts, bolts) and tighten if necessary.
- Clear the mowing area of debris like stones, toys, sticks, and wires.
- Ensure the grass catcher and deflector are properly fitted.
- Wear substantial footwear and long trousers.
- Check that the blade and drive systems disengage when levers are released.
Specs in practice
- Engine Displacement
- The size of the engine, ranging from 127cm³ to 196cm³, determining power output.
- Fuel Tank Capacity
- The amount of fuel the tank can hold, ranging from 1.9L to 3.6L.
Images and diagrams
- Parts Description: Identifies the throttle, handles, clutches, and rollers.
- Assembly: Shows the handlebar connection points.
- Oil Filling: Illustrates the dipstick and oil level limits.
- Belt Adjustment: Shows the tensioning points for the drive and cylinder belts.
- Cartridge Change: Shows the securing plate and locating shaft for the cartridge system.
Model compatibility
- The Fortis lawncare system supports 7 different cartridges.
- The 10-bladed cartridge is recommended for the finest lawns or professional sports greens.
- The 'L' mark on the height scale indicates 'Low' for specific cartridges.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.