5-21
MAINTENANCE
INSPECTING THE HYDRAULIC OIL TANK
LEVEL AND REPLENISHING
Oil may spurt out if caps or filters are
removed or pipes are disconnected
before releasing the pressure in the
hydraulic system.
• Gradually loosen the vent plug to relieve
tank pressure.
Inspection
The oil level changes with the oil
temperature. Inspect the oil by maintaining
the machine at posture shown in the figure at
the next.
• Machine posture for inspecting the
hydraulic oil level
DAILY INSPECTION (EVERY 10 HOURS)
1. Start the engine and run it at low speed.
2. Fully extend the crawler width.
3. Fully retract the cylinders (arm and
bucket), and lower the bucket to the
ground.
4. Lower the dozer blade, and then stop the
engine.
5. Inspect the oil level using the sight gauge
(1).
· When the oil temperature is about 20°C
(68°F):
The level should be between the upper
limit (H) and the lower limit (L).
If it is below the lower limit (L), replenish.
· When the oil temperature is about 50 to
80°C (122 to 176°F):
The level should be slightly below the
upper limit (H).
Replenishing
IMPORTANT: Do not fill up to the level
higher than the upper limit (H). It will
damage the hydraulic circuits or result in
oil spurting. If accidentally done, stop the
engine and wait the hydraulic oil to cool,
and then let the excessive oil to drain
from the drain plug.
1. Open the side cover.
2. Slowly loosen the plug (2) to relieve the
internal pressure, and then remove the
plug.
3. Add the hydraulic oil up to the middle of
the sight gauge (1).
4. Tighten the plug (2).
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