Kubota U50-5, Руководство по эксплуатации

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130
W9272-8135-1
05/2020
Operation
Return change valve for direct return flow
According to the mode of operation of a given attachment, the return flow of the hydraulic oil must occur either via
the control valve (indirect return flow) or directly to the hydraulic oil tank (direct return flow). The return flow is me-
chanically switched by the change valve.
The change valve has two settings:
Activating the return change valve
When "direct return flow" (3) is enabled, the return flow is directed
from the attachment to the hydraulic oil tank via the return filter. The
return flow is directed via the right auxiliary port 1 connector at the
arm only.

Flip the lever on the change valve (1) to the horizontal position
(3).
The direct return flow is enabled.
When "indirect return flow" (2) is enabled, the return flow is directed
from the attachment to the return filter via the control valve and then
to the hydraulic oil tank. In that case, the return flow may use the left
or right auxiliary port 1 connector of the arm (depending on the po-
sition of the rocker switch for auxiliary port 1).

Flip the lever on the change valve (1) to the vertical position (2).
The indirect return flow is enabled.
Move the return change valve to the required position as shown in the figure, depending on the action of the im-
plement being used (rotary or breaking).
The "direct return flow" switch position is used for hammering attachments, such as a hydraulic ham-
mer.
The "indirect return flow" switch position is used for rotating attachments, such as a rotary gripper, an
auger, etc.
If the change valve is in position "direct return flow", although an attachment with indirect return flow
has been mounted, the return flow to the hydraulic tank remains open!
This can lead to sudden movements or falling down of the attachment, even if the machine has been
switched off.
- Make sure that the change valve is switched according to the attachment.
STOP