8.4—CHARGING A BATTERY

1.Remove the battery from the tractor before charging.

2.Be sure charger is “Off”.

3.Connect charger leads to battery. Connect the positive (+) connector from the charger to the positive battery terminal. Connect the negative (–) connector of the charger to the negative battery terminal.

To avoid possible injury, stand away from battery when charger is turned on. A damaged battery or a battery with an internal short could explode.

4.Charge the battery using one of the methods shown below. Follow the manufacturer’s instructions on the charger.

5.If when charging the battery, violent gassing or spewing of electrolyte occurs, or the battery case feels hot (125 F- 52 C), reduce or temporarily halt charging to avoid damaging the battery.

6.Always turn charger to “Off” before removing a the battery.

MAINTENANCE:

Slow Charge

Fast Charge

10 hours @ 5 amps

2-1/2 hours @ 20 amps

5 hours @ 10 amps

1-1/2 hours @ 30 amps

 

1 hour @ 45 amps

8.5—BED KNIFE REPLACEMENT

When the bed knife becomes damaged or too worn to keep sharp, it must be replaced. Design improvements have made bed knife replacement easier with bolt-on construction. Follow the procedure below.

1.The backbar (1), bed knife (2) and fasteners have been assembled at the factory under tension. To ease replacement and prevent misalignment of components, the leading edge of the backbar must be tack welded two or three places before the old fasteners are removed.

2.Remove shoulder nuts (3) and flat head screws (4). If shoulder nuts are badly rusted or corroded, they may have to be cut off and screws driven out to be removed.

3.Clean the bottom surface of the backbar for maximum metal contact with the new bed bar.

4.Fasten the new bed knife to the bottom of the backbar in the position shown (bent edge up). Shoulder of shoulder nuts must be seated firmly in the backbar and screws must be flush with the bottom of the bed knife.

5.Torque shoulder nuts 35 to 40 ft/lbs.

8.6—FUEL FILTER

Before servicing the fuel filter, thoroughly clean outside of filter housing and fuel hoses, dirt must not be allowed to enter into fuel or fuel system. Refer to the engine manual for specific instructions.

8.7—ENGINE

Refer to Engine Manual for manufacturer’s maintenance recommendations. Change oil and oil filter after the first 25 hours of operation and every 150 hours thereafter.

NOTE

Engine replacement parts should be ordered through your local Briggs & Stratton dealer.

8.8—ELECTRICAL SYSTEM

Make certain all terminals and connections are kept clean and properly secured.

1.Check switches regularly to be sure they are kept clean and operating correctly. See 7.2, 7.3 and 7.4 in the “Adjustments” section.

2.Keep wire harness and all individual wires away from moving parts to prevent abrasive wear or potential short circuits.

3.Exercise extreme care when working with the electrical system.

Tack weld this edge

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HY70OM-8/99

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National Mower HYD70OM-8/99 Charging a Battery, BED Knife Replacement, Fuel Filter, Electrical System, Maintenance