TO PRESSURIZE
1. It is necessary to pressurize the hydraulic oil tank in case of the following :
(1) When the cover or the plug on the hydraulic oil tank is removed, due to some reason.
(2) When the hose is removed from the hydraulic circuit for the repair or check, due to
oil leakage or others.
(3) When the major component is exchanged, or others.
2. Purpose
It is easier for the hydraulic pump to suction the oil.
(Suction pressure of the pump should not have the negative pressure.)
3. Procedure
(1) Remove the cover of the hydraulic oil tank. If the machine has a plug on it, it is
advisable to remove only the plug.
(2) Start the engine and extend all cylinders as the Figure 2.
*Hydraulic oil go to the cylinders to be the lowest oil level in the tank.
(3) At the condition of ii), tighten the cover or plug of the tank.
*Work with your caution, the dozer cylinder is also extended at maximum stroke.
After this work and machine is operated, the oil in the cylinder go back to the tank.
And then, the oil level in the tank is increased, inside the tank is pressurised.
This label on the side cover. PART No. 11240-11960
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Figure 1
Summary of Contents for HY2270001
Page 1: ...OPERATION MANUAL SER NO HY2270001 ...
Page 2: ...https marengine com r22 7 excavator ...
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Page 16: ... 63 Figure 2 ...
