Height Adjustment; Engine Air Cleaner; Spark Plug; Cutting Blade - Makita PLM4621N Original Instruction Manual

8-8 DECK
The underside of the mower deck should be cleaned after
each use to prevent a buildup of grass clippings, leaves,
dirt or other matter. If this debris is allowed to accumulate,
it will invite rust and corrosion, and may prevent proper
mulching. The deck may be cleaned by tilting the mower
and scraping clean with a suitable tool (make certain the
spark plug wire is disconnected).

8-9 HEIGHT ADJUSTMENT

INSTRUCTIONS
CAUTION: Do not at any time make any
adjustment to lawn mower without first stopping the
engine and disconnecting the spark plug wire.
CAUTION: Before changing mowing height, stop
mower and disconnect spark plug cable.
Your mower is equipped with a central height adjustment
lever offering 5 height positions.
1. Stop mower and disconnect spark plug cable before
changing mower cutting height.
2. The central height adjustment lever offers you
5 different height positions.
3. To change the height of cut, squeeze adjuster lever
toward the wheel, moving up or down to selected
height. (Fig. 23) All wheels will be in the same height
of cut.
9. MAINTENANCE
INSTRUCTIONS

SPARK PLUG

Use only original replacement spark plug. For best results,
replace the spark plug every 100 hours of use. (refer to
ENGINE OWNER'S MANUAL)
BRAKE PADS
Check and/or replace the engine brake pads in service
agent regularly, only original parts can be used as
replacement.

10. LUBRICATION INSTRUCTIONS

CAUTION: DISCONNECT SPARK PLUG
BEFORE SERVICING.
1. WHEELS-Lubricate the ball bearings in each wheel at
least once a season with a light oil.
2. ENGINE-Follow engine manual for lubrication
instructions.
3. BLADE CONTROL-Lubricate the pivot points on the
blade control handle and the brake cable at least once
a season with light oil. The blade control must operate
freely in both directions.
12
11. CLEANING
CAUTION: Do not hose engine. Water can
damage engine or contaminate the fuel system.
1. Wipe deck with dry cloth.
2. Hose under deck by tilting the mower so that the spark
plug is up.

11-1 ENGINE AIR CLEANER

CAUTION: Do not allow dirt or dust to clog the air
filter foam element.
The engine air cleaner element must be serviced
(cleaned) after 25 hours normal mowing. The foam
element must be serviced regularly if the mower is used in
dry dusty conditions. (refer to ENGINE OWNER'S
MANUAL)
To CLEAN AIR FILTER
1. Remove screw.
2. Remove cover.
3. Wash filter element in soap water. DO NOT USE
GASOLINE!
4. Air dry filter element.
5. Place a few drops of SAE30 oil on the foam filter and
squeeze tightly to remove any excess oil.
6. Reinstall filter.
7. Close the filter cover.
NOTE: Replace filter if frayed, torn, damaged or
unable to be cleaned. (Fig. 24)

11-2 CUTTING BLADE

CAUTION: Be sure to disconnect and ground the
spark plug wire before working on the cutting blade to
prevent accidental engine starting. Protect hands by using
heavy gloves or a rag to grasp the cutting blades.
Tip mower as specified in separate engine manual.
Remove the hex bolt and washer which hold the blade
and blade adapter to the engine crankshaft. Remove the
blade and adapter from the crankshaft.
WARNING: Periodically inspect the blade
adapter for cracks, especially if you strike a foreign object.
Replace when necessary.
For best results your blade should be sharp. The blade
may be resharpened by removing it and either grinding or
filing the cutting edge keeping as close to the original
bevel as possible. It is extremely important that each
cutting edge receives an equal amount of grinding to
prevent an unbalanced blade. Improper blade balance will
result in excessive vibration causing eventual damage to
the engine and mower. Be sure to carefully balance blade
after sharpening. The blade can be tested for balance by
balancing it on a round shaft screwdriver. Remove metal
from the heavy side until it balances evenly. (Fig. 25)