8
5-5 Bleeding air from the system
CAUTION
Reservoirs of UP-35RH-Series pumps are made of totally enclosed rubber tanks and tank
covers. Rubber tanks are filled with oil, making no room for air accumulation. However, in
case a new cylinder and / or new hose is connected with the pump, or oil is exchanged, air
may accumulate in the hydraulic system. This air will cause the pump not deliver oil or
the cylinder to respond in an unstable or slow manner. Be careful with air accumulation
in the system. To remove this air;
①
Is the tank full with oil?
Make sure that the cylinder is retracted fully (otherwise, replenishment will become too
much, resulting in damage of the oil tank) and position the pump with the oil tank end
down as shown below. Remove the oil feeding plug and check oil volume. Replenish oil if
the oil is not full. Replace the oil feeding plug.
②
In case even if the tank is full oil cannot be delivered to develop pressure, stand the pump
with the tank end down and do inching operation (intermittent switching) with the
pendant switch about 10 to 11 times.
③
In case oil could not be delivered to develop pressure, place the pump horizontally (normal
position) and push the rubber bag through the hole (8mm dia.) on the tank cover end with
a rod having a round end, with attention that the rubber bag does not get hurt, and at the
same time do inching operation with the pendant switch.