Check Automatic Grease System; Method For Cleaning Line Filter And Removing Dirt; Periodic Checks - Komatsu PC490LC Installation And Instruction Manual

MAINTENANCE
If a breaker or other attachment is installed, perform the air bleeding procedure until the air is completely bled
from the attachment circuit.
1.
Turn the fuel control dial to Low idle (MIN) position.
2.
Repeat operating the attachment approximately 10 times to bleed air.
3.
Check that there is no leakage of oil and wipe off any oil that is spilled.
4.
After completing the air bleeding operation, check the oil level, and if the oil level is low, add oil.

METHOD FOR CLEANING LINE FILTER AND REMOVING DIRT

(if equipped)
If any abnormality is found in hydraulic components such as pumps, remove the dirt from the line filter as fol-
lows.
Before removing the line filter, release the internal pressure in the hydraulic circuit referring to "METHOD FOR
CHECKING AND RELEASING NITROGEN GAS CHARGE PRESSURE IN ACCUMULATOR (FOR CONTROL
CIRCUIT) (4-66)".
The line filter is at the position shown with the arrow.
1.
Remove plug (2).
2.
Remove filter (1).
3.
Clean filter (1).
Thoroughly clean the filter to remove dirt from its side face,
as well.
4.
Replace O-ring (3) with a new one.
5.
Install cleaned filter (1).
Tightening torque for plugs (2): 270 ± 30 Nm {27.5 ± 3
kgm}
After assembling the line filter, bleed air. For the procedure, see "METHOD FOR BLEEDING AIR FROM HY-
DRAULIC CIRCUIT (4-39)".

CHECK AUTOMATIC GREASE SYSTEM

PERIODIC CHECKS

1.
Check the grease level in the reservoir, but do not refill the reservoir before minimum level is reached.
2.
Check the in-cab display is functioning.
3.
Check if the selected interval time is correct for the working conditions of the machine.
4.
Check the pump for damage and leakage.
5.
Check the grease pipes for damage and leakage.
6.
Check the condition of the grease points served by the system. Sufficient fresh grease should be visible.
7.
Check the operation of the system. Perform a cycle test.
8.
Check the pump unit and its surroundings. Attention - avoid using high pressure wash directly on the pump.
9.
Replace or clean the pump filler filter (behind the connector on the reservoir) every 500 hours.
MAINTENANCE PROCEDURE
4-41