Maintenance And Storage; Blade Maintenance; How To Clean - Murray MP450D20 Manual Del Operador

9. Maintenance and storge
To maintain the lawnmower's ability to operate safe and
effectively, it is very important to follow the instructions below
for maintenance and storage.
!
WARNING! Before performing any maintenance or
cleaning, stop engine and wait until mower blade come to
a stop totally. Remove the spark plug boot from the spark plug.
9.1 Normal Maintenance Notes
1. Keep all nuts, bolts and screws tight to be sure that the
equipment is in safe working condition.
2. Check the grass catcher frequently for wear or
deterioration.
3. Replace worn or damaged parts for safety.
4. Improper maintenance, use of non-qualified or fake
replacement components, or the removal or modification of
safety components can damage the lawnmower and injure
the operators seriously.
5. Only use blades and other spare parts recommended by
Briggs & Stratton. The use of non-genuine parts can damage
the machine and injure the operators. Keep the lawnmower in
good working condition.
9.2 Tilting the Lawnmower
For any cleaning or maintenance that involves the underside
of the deck, follow this procedure to tilt the mower to access
this area of the lawnmower:
1. Empty the fuel tank; ideally let the engine run until all the
fuel is used up:
• Never leave the lawnmower unattended while running.
• Only run in a well-ventilated area.
• If the fuel tank has to be drained, this should be done
outdoors.
2. Tilt the lawnmower sideways:
• Always tilt with the muffler side towards the floor.
• Do not tilt by more than 90 degrees.
9.3 Cleaning
The lawnmower should be cleaned thoroughly after every use.
Always clean the lawnmower immediately after use;
• Do not allow grass debris and other debris to become
dry and hard on any of the mower surfaces.
• Dried grass debris and dirt may impair the mowing
operation.
• Dried debris can be more difficult to remove without
damage to the lawnmower.

9.3.1 How to Clean

For side discharge and collecting models
Clean all grass debris from any discharge chutes (side and /
or rear discharge chute).
For all models
Follow the procedure above in section 9.2 Tilting the
Lawnmower.
Thoroughly clean the underside of the deck.
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9.4 Engine cleaning & Maintenance
!
NOTE! Refer to the Operators Manual of the engine for
all engine maintenance.
!
NOTE! Check and/or replace the engine brake pads in
service agent regularly, only original parts can be used
as replacement.

9.5 Blade Maintenance

!
WARNING! Before performing any maintenance or
cleaning, stop engine and wait until mower blade come to
a stop totally. Remove the spark plug boot from the spark plug.
• To inspect the blade assembly, follow the procedure
above in section 9.2 Tilting the Lawnmower.
• Frequently check the blade (B in Fig.37) for wear or
damage including cracking, bending, deformation etc.
Ensure that the blade cutting edge is sharp (a blunt blade
will roughly tear grass, turning the tips of grass brown).
• Frequently check the bolt (D in Fig.37) that holds the
blade in position; Ensure that the bolt is tightly fastened.
• If the blade hits an object, stop the engine immediately,
disconnect spark plug boot from spark plug. Check the
whole blade assembly which includes the bolt (D in
Fig.37), washer(C in Fig.37), blade (B in Fig.37) and blade
adapter (A in Fig.37).
• If any parts of the blade assembly are found to be
damaged, they should be replaced immediately. Do not
operate the lawnmower with any damaged parts.
• As a minimum, the blade assembly should be replaced
every two years.
• When replacing any component of the blade assembly,
all other components of the blade assembly should be
replaced at the same time.
!
NOTE! The blade assembly must only be removed and
serviced by a Briggs & Stratton authorized service
agent.
!
NOTE! Use only Briggs & Stratton genuine replacement
or recommended parts. Any other parts may not be
suitable and could endanger safety.
• When installing the blade assembly, the torque on the
blade bolt should be between 45Nm and 55Nm.
Fig. 37
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