National Mower HYD70OM-8/99 Hydraulic OIL Filter, Handle BAR Removal, Jumper Cables, Lubrication

MAINTENANCE, Continued

8.11—HYDRAULIC OIL FILTER

To prevent damage to the hydraulic system, the hydraulic oil filter should be changed after the first 25 hours of operation and every 250 hours thereafter.

1.Remove the old filter and fill new filter with clean fluid.

2.Install new filter. Hand tighten only.

3.Run engine at idle speed with hydrostatic pump in neutral for five minutes.

4.Check hydraulic oil level and add if necessary.

Frequent checks must be made on the oil level in the hydraulic system. Should the pump run short of oil, immediate and permanent damage will result.

8.12—HANDLE BAR REMOVAL

For easy removal of handle bars follow this procedure.

1.Cut away rubber coating above steering hub. (Shown in diagram) Clean internal threads as necessary.

2.Insert 3/8”-24NF X 2" hex head capscrew. (Fully threaded if possible).

3.Loosen set screws attaching handle bars to the steering shaft.

4.Screw capscrew in until handle bars are removed.

5.Reinstall handle bars and replace the 2" long

capscrew with a 3/8”-24NF x 3/8” long capscrew to prevent future rusting of steering hub to shaft.

8.13—JUMPER CABLES

Before attempting to “jump” the battery, check the condition of the battery, check the water level and refer to the battery manufacturer’s instructions.

1.Stop the engine on vehicle with good battery.

2.Connect one jumper cable to positive terminal on good battery. Connect other end of the jumper cable to the positive terminal on the dead battery.

3.Connect one jumper cable to negative terminal on good battery. Connect other end of negative jumper to ground (frame) of vehicle with dead battery.

8.14—LUBRICATION

Refer to “Lubrication” Section, Pages 24 and 25 of this Maintenance Manual.

8.15—PAINTING

For protection and appearance, clean and retouch scratched or worn painted surfaces. National Mower green and white spray paint cans, in 12-3/4 ounces, are available at your National Mower Equipment Distributor.

8.16—BELT REPLACEMENT

NOTE

To make belt changes easier a belt tool kit is available through National Mowers parts department. (Refer to section 4.3).

Belts should be inspected regularly, worn or damaged belts may cause poor mowing results or disrupt operation. If a belt change is necessary follow these steps.

1.Remove the mounting bolts securing the pivot bracket on the two front cutting units.

This bracket is spring loaded. Slowly rotate the pivot bracket.

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