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 10 minutes.
1.1 Steering and ACC charging pump
(double gear pump)
1. Fill the hydraulic oil tank with the hydraulic oil.
2. With the engine stopped, loosen the air-bleed plug
(G1/4) on the suction flange of the main pump.
After bleeding from the suction side, tighten the
plug again.
3. Start the engine (with air conditioner OFF and
PTO OFF), and run it at idle (approximately 700
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 hydraulic oil tank with the hydraulic oil. (If
the suction section is disassembled due to repair
or other reasons, bleed 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.
Pour the hydraulic oil from this drain port until the
oil overflows, then tighten the plug.
3. Start the engine with PTO ON, and run-in the
pump at idle for 5 minutes.
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