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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Battery Charging - MS, MC, MD, MT, MTL, MTEFI
IMPORTANT: On MTEFI and MTLEFI models, al-
ways disconnect the negative (-) battery terminal
before charging. Failure to do so can result in dam-
age to the ECU.
1. Charge the battery at 15 amps for 10 minutes. DO
NOT exceed 20 amps maximum recommended
charging rate. Charge until specific gravity is at
least 1.250. Total charging time should not exceed
one (1) hour.
2. After charging the battery, adjust the electrolyte
level to the bottom of the vent wells [1/4 to 1/2 in. (6
to 13 mm) above the plates].
IMPORTANT: DO NOT overfill the battery. Elec-
trolyte will overflow through the vented caps onto
parts of the machine and WILL result in severe cor-
rosion.
3. Install battery.
Battery Charging - Model MW, MB
Limit initial charging current to 1000mA. Charge until
battery voltage (under charge) reaches 14.40 to 14.70
volts at 68°F (20°C). Hold at 14.40 to 14.70 volts until
current drops to approximately 50mA. Battery is fully
charged under these conditions, and charger should be
disconnected.
NOTE: Due to the self-discharge characteristics of
this type of battery, it is imperative that it be charged af-
ter 6-9 months of storage, otherwise permanent loss of
capacity might occur as a result of sulfation.
Battery Installation - All Models
IMPORTANT: Make sure battery is securely mounted
in the frame. A loose battery may cause damage to the
case resulting in acid leakage and severe damage to
the machine. A hazard may be created by damage to
critical working parts and safety systems.
Install the battery in the mower as shown in Battery In-
stallation photo. Connect the positive (+) first and then
the negative (-) cables to the proper battery terminal
(red cable and boot connects to the Positive (+) ter-
minal). Slide the rubber boot up and over the battery
post, making sure it covers the post completely to pre-
vent an electrical short.
DANGER
BATTERIES PRODUCE EXPLOSIVE GASES
• Charge the battery in a well-ventilated
area, so that gases produced while charg-
ing can dissipate.
• Keep sparks, flames, and smoking mate-
rials away from the battery at all times.
• Make sure the battery cap vents are open
after the battery is filled with acid (check
manifold vent on each cap).
• Make sure the battery charger is unplug-
ged before connecting or disconnecting
cables to the battery.
DANGER
BATTERIES PRODUCE EXPLOSIVE GASES
• Charge the battery in a well-ventilated
area, so that gases produced while charg-
ing can dissipate.
• Keep sparks, flames, and smoking mate-
rials away from the battery at all times.
• Make sure the battery charger is unplug-
ged before connecting or disconnecting
cables to the battery.
WARNING
Make sure the battery cap vents are open.
Improper venting of the battery COULD
cause a battery explosion.
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