© Mar. 2023
66 AB16EJ Plus Maintenance Manual
HYDRAULIC SYSTEM
7.3 HYDRAULIC OIL
Check Oil Level
Maintaining the hydraulic oil at the right level is essential
for the normal operation of the machine. If the hydraulic
oil level is too high, the oil will overflow from the oil tank
during the operation of the machine; if the hydraulic oil
level is too low, the oil pump will have entrained air dur-
ing the operation of the machine and hydraulic compo-
nents will be damaged.
1. Make sure the boom is in stowed position.
2. Open the left turntable cover and visually inspect
the side of the hydraulic tank. The hydraulic oil level
should be within the scale line range of level indica-
tor in the tank.
3. If necessary, fill with correct hydraulic oil according
to the Oil Requirements , and do not overfill the
tank.
4. Check the hydraulic tank body and joints for
leakage.
Check the Cleanliness of Hydraulic Oil
Check the hydraulic oil, and if any of the following condi-
tions are found, replace the hydraulic oil:
• The hydraulic oil is milky white and cloudy.
• The hydraulic oil is black.
• Take some hydraulic oil and check it in the sun to
find there are luminous metal spots, or rub the hy-
draulic oil with two fingers to find there are metal par-
ticles obviously.
• The hydraulic oil stinks.
Replace Hydraulic Oil
It is recommended to replace the hydraulic oil every
year or after 1000 hours of operation. The replacement
interval should be shorter in harsh working
environments.
NOTICE
Every time the hydraulic oil is replaced, the hydraulic
tank suction filter must also be replaced.
1. Turn off the machine and make sure the hydraulic
oil has cooled to room temperature.
2. Open the left turntable cover and locate the hydraul-
ic tank.
3. Close the hydraulic shut-off valve located on the
side of the tank.
4. Place an appropriate oil-collecting container under
the drain plug at the bottom of the tank.
5. Remove the drain plug at the bottom of the tank to
drain all the oil into the container.
6. Install the drain plug.
7. Disconnect and plug the hydraulic tank suction pipe
and return pipe.
8. Remove the cover from the tank after removing the
upper cover fastening bolts of the hydraulic tank.
9. After cleaning the inside of the tank with a neutral
solvent, open the drain plug to drain the solvent.
10. After the hydraulic tank is dry, install the cover and
connect the suction pipe and return pipe to the hy-
draulic oil tank.
11. Fill with correct hydraulic oil according to the Oil Re-
quirements , and never overfill the tank.
7.4 HYDRAULIC TANK
Fig 9 Schematic diagram of hydraulic tank
structure
Table 7-9 Hydraulic tank structure
No.
Description
1
Tank body
2 Air filter
3 Level indicator
4 Suction Filter
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