Komatsu WA250PT-5H, Руководство по эксплуатации и техническому обслуживанию, Страница: 228 / 255

Service procedure
MAINTENANCE
Every 2000 hours service
4-54
Every 2000 hours service 0.
Maintenance for every 50, 100, 250, 500 and 1000 hours service should be carried out at the same time.
Change oil in hydraulic tank, replace hydraulic filter element 0.
WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for
the temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
Refill capacity: 67 liters (17.70 US gal)
1. Lower the bucket horizontally to the ground and apply the parking brake, then stop the engine.
2. Remove covers (1) and (2).
3. Keep grip (3) pulled, then turn oil filler cap (F) counterclock-
wise and remove it.
4. Set a container to catch the oil under drain plug (P).
5. Loosen drain plug (P), drain the oil, then tighten drain plug
(P) again.
6. Using a filter wrench, turn cartridge (4) to the left to remove
it.
7. Clean the filter holder, fill the new filter cartridge with
hydraulic oil, then coat the seal and thread of the filter car-
tridge with hydraulic oil (or coat thinly with grease) and
install.
When installing the seal, tighten it until its surface comes to
contact with the filter holder, then tighten it 1/3 turn more.
8. Add hydraulic oil through the filler port to refill level.
9. Check that the hydraulic oil is at the specified level. For
details, see “Check oil level in hydraulic tank, add oil on
page 4-40“.
10.Run the engine at low idling, and extend and retract the
steering, bucket, and lift arm cylinders 4 to 5 times. Be
careful not to operate the cylinder to the end of its stroke
(stop approx.100 mm (3.9 in) before the end of stroke).
NOTICE
If the engine is run immediately at high speed or the cylinder is operated to the end of its stroke, the air
inside the cylinder will cause damage to the piston packing.
11. Next, operate the steering, bucket, and lift arm cylinders to the end of their stroke 3 to 4 times, then stop the
engine and loosen fillercap to bleed the air from the hydraulic tank.
12.Check that the hydraulic oil level and add oil to the specified level. For details, see “Check oil level in hydraulic
tank, add oil on page 4-40“.
13.Next, raise the engine speed and follow the procedure in Step 11 to bleed the air. Repeat this process until no
more air comes out.
14.After completing the air bleed operation, install cover (1) and (2).