Air Bleeding Procedure

Y-4 Air Bleeding Procedure

1. Hydraulic pump

[NOTICE]

Be sure that the following conditions are met before starting the engine.

• PTO : OFF

• Air conditioner : OFF

The following is also possible: After performing step 3 under 1.1, perform step 2 under 1.2. Start the engine, then turn ON the PTO, and run-in the pump for 5 minutes. However, crane operation including outrigger operation is prohibited during bleeding.

1.1 Steering and accumulator(ACC) charging pump (triple gear pump)

1. Fill the oil tank with hydraulic oil

2. With the engine stopped, loosen the air-bleed plug (G1/4) on the suction flange of the main pump. After bleeding air from the suction side, tighten the plug again.

[NOTICE]

The unload relief valve is in unload status at all times unless PTO is ON.

3. Start the engine (with air conditioner and PTO OFF) and run it at idle (approximately 600 min-1) for 1 minute to bleed the circuit.

4. Start the engine, and run-in the pump for 10 minutes at idle.

1.2 Main pump

1. Fill the oil tank with hydraulic oil. (If the suction section was disassembled for repair or other reasons, bleed air from the air-bleed plug on the suction side, as described above.)

2. Bleed the pump case. Remove the drain plug or the drain hose of the pump. Pour the hydraulic oil into this location until the oil overflows, then reinsert the plug.

3. Start the engine with PTO ON, and run-in the pump at idle for 5 minutes.