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Maintaining your lawn mower, Warning – Troy-Bilt 420 User Manual

Page 11

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Figure 5-3: Removing the rear flap.

5

Maintaining

Your Lawn

Mower

WARNING

When removing

the cutting blade

for sharpening or

replacement, protect

your hands with a

pair of heavy gloves

or use a heavy rag to

hold the blade.

An unbalanced blade

will cause excessive

vibration when rotat-

ing at high speeds. It

may cause damage

to mower, and could

break causing per-

sonal injury.

Blade Care

WARNING: When removing the cutting blade
for sharpening or replacement, protect your

hands with a pair of heavy gloves or use a heavy rag
to hold the blade.

Periodically inspect the blade adapter for cracks,
especially if you strike a foreign object. Replace when
necessary. Follow the steps below for blade service.
1. Disconnect spark plug wire from spark plug. Turn

mower on its side making sure that the air filter and
the carburetor are up.

2. Remove the bolt and the bell washer which hold the

blade and the blade adapter to the engine crankshaft.
See Figure 5-2.

3. Remove blade and adapter from the crankshaft.
4. The blade can be sharpened with a file or on a grind-

ing wheel. Do not attempt to sharpen the blade while
it is still on the mower. When sharpening the blade,
follow the original angle of grind and grind each cut-
ting edge equally to keep the blade balanced. Balance
the blade on a round shaft screwdriver. Remove metal
from the heavy side until it balances evenly.

WARNING: An unbalanced blade will cause
excessive vibration when rotating at high

speeds. It may cause damage to mower, and could
break causing personal injury.

5. Lubricate the engine crankshaft and slide the blade

adapter onto the engine crankshaft.

6. Place the blade on the adapter such that the side

of the blade marked “Bottom” (or with part number)
faces the ground when the mower is in the operating
position. Make sure that the blade is aligned and
seated on the blade adapter flanges.

7. Place bell washer on the blade. Align notches on the

blade bell support with small holes in blade.

8. Replace hex bolt and tighten hex bolt to torque: 450

in. lbs. min., 600 in. lbs. max.

To ensure safe operation of your mower, periodically
check the blade bolt for correct torque.

Replacing Rear Flap

1. To remove rear flap, lift rear door, and press flap in on

either side to remove from hole. See Figure 5-3.

2. Remove flap from opposite hole and replace with new

flap in the opposite order and manner of removal.

Off-Season Storage

The following steps should be taken to prepare your
lawn mower for storage.
• Clean and lubricate mower thoroughly as described

in the lubrication instructions.

• We do not recommend the use of a pressure washer

or garden hose to clean your unit.

• Refer to engine manual for correct engine

storage instructions.

• Coat mower’s cutting blade with chassis grease to

prevent rusting.

• Store mower in a dry, clean area. Do not store next

to corrosive materials, such as fertilizer.

When storing any type of power equipment in a poorly
ventilated or metal storage shed, care should be taken
to rust-proof the equipment. Using a light oil or silicone,
coat the equipment, especially cables and all moving
parts of your lawn mower before storage.

Figure 5-2: Remove blade and hardware.

Hex Bolt

Blade

Blade
Adapter

Bell
Washer