Walker MDD (20.9 HP) - Manual (Page 65)

61
Maintenance Instructions
CHECKING/SERVICING
Check the coolant level in the coolant recovery tank
and maintain the coolant level between the FULL
and LOW marks on the recovery tank. When the
engine is cold, the coolant level should be at or
slightly above the LOW mark on the recovery tank.
If the coolant level is low, remove the radiator cap
and fill to the overflow port level and then fill the re-
covery tank above the LOW mark. Use a pre-mixed
50/50 solution of antifreeze (ethylene glycol) and
distilled water to fill the cooling system.
IMPORTANT: The coolant solution of antifreeze
and distilled water must be thoroughly pre-mixed be-
fore putting it in the engine (adding pure antifreeze
into the radiator may cause damage to the engine by
causing overheating).
Fan Belt Tension
Check and adjust the fan belt tension to avoid en-
gine overheating and insufficient battery charg-
ing. Push on the belt in the middle of the span
between the alternator and crankshaft. If properly
tensioned, it should deflect about 0.4 in. (10 mm).
Also check the belt for cracks or deterioration.
Fan Belt Tension
Security of Air Filtration Components
NOTE: The following inspection is only an exter-
nal inspection and should be done without “dis-
turbing” the filtration components.
On a daily basis, visually inspect the external condi-
tion of the complete air cleaner system. The follow-
ing items should be inspected:
1. Check the Donaldson Radialseal™ air cleaner
canister for damage. Make sure the cover is in
place and the cover latches are secure - do not
run the engine without the air cleaner cover in
place and secure.
2. Inspect the air intake hose for cracks, nicks,
cuts, etc., and check the hose clamps for tight-
ness.
Battery
NOTE: For initial battery service during setup, re-
fer to Battery Service in
Assembly Instructions .
IMPORTANT: Make sure battery is securely mount-
ed in the frame. A loose battery may cause damage
to the case resulting in acid leakage and severe dam-
age to the machine. A hazard may be created by
damage to critical working parts and safety systems.
Electrolyte Level
The battery electrolyte level should be checked af-
ter every 25 hours of operation. To check electro-
lyte level:
1. Remove battery cell filler caps.
2. Check the electrolyte level. If the level is below
the bottom of the vent well, fill with drinking wa-
ter to the bottom of the vent wells [1/4 to 1/2 in.
(6 to 13 mm) above the plates].
3. Replace filler caps.
IMPORTANT: DO NOT overfill the battery.
Electrolyte will overflow through the vented caps
onto parts of the machine and WILL result in se-
vere corrosion.
Cleaning the Terminals
If battery terminals are corroded, remove battery
from the mower. Using a wire brush, remove corro-
sion with a solution of one part baking soda and
four parts water. Rinse with clean water. Coat the
terminals with petroleum jelly or terminal protector
spray to retard further corrosion.
0.4 in. (10 mm)
Deflection
Fan Belt