Ferris 5900300 Operator's Manual - Caution

Not for 

Reproduction

31

Regular Maintenance

Servicing the Mower Blades

Removing the Mower Blade

 1.  To remove the mower blade, wedge a wooden 

block between the mower blade and the mower 

deck housing to keep the blade from turning and 

remove the mower blade mounting bolt with a 

15/16” wrench (Figure 22).

Inspecting the Mower Blade

 1.  Remove the mower blade from the unit.

 2.  Inspect the mower blade (Figures 23 & 24).  

Discard the mower blade if it has any of the below 

conditions:

    A.) Has more than .5” (12,7 mm) of the mower 

blade metal removed from previous sharpening or 

wear (D, Figure 23).

    B.) The air lifts are excessively eroded (B & C, 

Figure 24) and the notch (C) is .25” (6,35 mm) 

deep or greater.

    C.) Mower blade is bent or broken.

 3.  If the cutting edges are not sharp or have nicks, 

sharpen the blades.  See SHARPENING THE 

MOWER BLADES.

CAUTION

Avoid injury.  Mower blades are sharp.

 • Always wear gloves when handling mower 

blades or working near blades.

DANGER

Avoid injury.  A worn or damaged blade can 

break, and a piece of the mower blade could be 

thrown into the operator’s or bystander’s area, 

resulting in serious personal injury or death.

 • Inspect the mower blade every 25 hours or at 

least once a year.

 • If the mower blade hits a solid object, stop 

the engine immediately and inspect the mower 

blade.

 • Never weld or straighten bent mower blades.

Figure 22.  Loosening the Mower Blade for Removal

Figure 23.  Inspecting the Mower Blade Tips

A.  Mower Blade Cutting Edge

B.  Square Corner

C.  Air Lift

D.  Wear Measurement - DISCARD Mower Blade If  

greater than .5” (12,7 mm)

B

D

C

A

C

A

A

B

C

Figure 24.  Inspecting the Mower Blade Air Lifts

A.  New Mower Blade

B.  Mower Blade at Wear Limit (A notch begins to form)

C.  Mower Blade in Dangerous Condition (Notch measures .25” (6,35 mm) or greater DO NOT USE. Replace  

with new mower blade.)