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24. SERVICE PROCEDURE
24.9.3 CLEAN HYDRAULIC
RESERVOIR RELIEF VALVE
A
WARNING
+ Pressurized
Reservoir. Always loosen the filler plug slowly in case
there is still some pressure in the system.
+ Fire hazard - do not use kerosene, diesel fuel or flammable liquids to
clean parts. A spark or a flame could cause a fire or an explosion.
Use a nonflammable
commercial solvent.
1.
2.
3.
Park the machine on level ground, lower the blade to the ground and stop
the engine as outlined above. Turn the electrical master switch to OFF. Tag
all controls to prevent inadvertent starting. With the engine stopped, operate
the equipment lever several times to relieve any pressure. Open the right
side door at the hydraulic reservoir. Remove all outside dirt from breather.
Slowly loosen the filler plug on the reservoir in order to relieve any pressure
in the reservoir, then retighten.
Remove the lock ring (1) and cover (2). Remove the element (3) and clean
in a nonflammable commercial solvent. Dry thoroughly. Check o-ring (4) for
wear or deterioration. Replace if necessary. Replace filter (3) and cover (2).
Secure with lock ring (1). Reinstall the filler cap.
24.9.4 CHANGE HYDRAULIC
SYSTEM FLUID
1.
2.
3.
4.
5.
Start the engine and operate the blade to warm the oil for easy draining.
Position the machine to permit the blade to drop below ground level. Be sure
the piston rods are completely extended so the blade is entirely supported
by both cylinders at the maximum LOWER position. Place the control lever
in the FLOAT position.
Stop the engine. Shift to neutral and apply the neutral lock lever. Apply and
lock the parking brake. Turn the electrical system master switch to OFF.
Slowly loosen reservoir filler plug to relieve reservoir pressure.
Drain the reservoir into a suitable container by removing the filler plug and
the drain plug.
Service the return filter and the suction strainer.
REMARK
Use clean oil from a clean container. Maintain all packaging and fittings so
as to prevent leakage.
6. Reinstall the drain plug. Fill the reservoir with lubricant up to the center line
of the sight gauge. Reinstall the filler cap.
4
For details of the fluid to use, see 20. USE OF FUEL, COOLANT AND
LUBRICANTS
ACCORDING
TO AMBIENT TEMPERATURE.
7. Start the engine and run it at low idle speed. Operate all the controls through
all positions four or five times so the cylinders are filled with oil and air
expelled. Check the oil level and repeat until the fluid level remains at the
specified level in the reservoir.
3-49
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