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HY70OM-8/99
20
MAINTENANCE, Continued
8.11HYDRAULIC 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.
8.12HANDLE 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.
8.13JUMPER CABLES
Before attempting to jump the battery, check
the condition of the battery, check the water level and
refer to the battery manufacturers 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.
8.14LUBRICATION
Refer to Lubrication Section, Pages 24 and
25 of this Maintenance Manual.
8.15PAINTING
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.
8.16BELT REPLACEMENT
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.
NOTE