Exhaust the air in the hydraulic circuit When replace the hydraulic pump or replace the hard pipe and hose near the pump, or replace the hard pipe and hose of the working system or steering system, exhaust the air in the working system and steering system according to the following methods: (1) Open the cap of oil refill hole on the hydraulic oil tank; (2) Start the engine; (3) Make the engine running under idle speed, and extend and retract all cylinders of working system and steering system starting from the bottom of travel for 2 3 times about 50 60 mm .
(4) Run the engine with high speed and extend and retract all cylinders of working system and steering system under full travel for 3 5 times to exhaust the air in the pipeline. (5) After exhaust the air, set the machine and work equipment on the standard position (park the wheels in line, the front and rear frame is in the same line, the scraper blade and frame is of 90° and put them on the ground and drop the ripper to approach the ground), then check the oil volume and tight the cap of oil refill hole; (6) Stop the engine and check the hard pipe and hose for leakage.
(7) Notes during exhaust the air 7.1) When exhaust the air of steering oil cylinder, the scraper should be dropped and support the front frame to lift the front wheel off the ground; 7.2) When exhaust the air in the such hydraulic system as scraper blade turning, scraper side moving and scraper incline, the scraper blade should be raised; 7.3) When exhaust the air in the traction frame side incline system, the scraper should be dropped slightly; 7.4) When exhaust the air in the hinge steering system, the shift should be in Neutral position; 7.5) When the scraper is lifted and the oil cylinder of ripper is extended, the machine has been off ground.
Care should be paid when conduct this operation. 20-116