HYDRAULIC OIL FILTER

To prevent damage to the hydraulic system, the hydraulic oil filter (1, Figure 21), located under right fender, should be changed after the first 25 hours of operation and every 250 hours thereafter.

Figure 21

1.Remove the old filter.

2.Install new filter, filling filter with oil before re-installing. Apply oil to the o-ring of the filter prior to installation. Hand-tighten only.

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

4.Check hydraulic oil level, and add oil if necessary. Frequently check oil level in the hydraulic tank. Should the pump run short of oil, immediate and permanent damage will result.

BEDKNIFE REPLACEMENT

When the bedknife becomes damaged or too worn to keep sharp, it must be replaced. Follow the procedure below.

1.The backbar (1, Figure 22), bedknife (2, Figure 22), and fasteners have been assembled at the factory under tension. To ease replacement and prevent misalignment of components, you may wish to clamp the leading edge of the backbar two or three places before removing the old fasteners.

2.Remove shoulder nuts (3, Figure 22) and flathead screws (4, Figure 22). If shoulder nuts are badly rusted or corroded, they may have to be cut off and the screws driven out.

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 lbf/ft (47.4 to 54.2 N•m).

Clamp this edge

Figure 22

LUBRICATION

Figure 23 shows the top view of the 8400 with guards removed. Lubricate your tractor at the recommended locations and intervals using proper lubricants so that maximum service and long life of the machine may be obtained.

CAUTION: Before doing any work on your machine, stop the engine, remove the ignition key, and set parking brake.

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National Mower 99500500-8400 manual Hydraulic OIL Filter, Bedknife Replacement, Lubrication
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99500500-8400 specifications

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