Unic URW295CUR - When Telescoping Cylinder 2 Retracts

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Pipe for cord reel

4) When Telescoping Cylinder2 retracts

󳊉１４－４󳊊

How oil flows when tele2 is retracted

Pressure oil ows through the dual cylinder of cylinder rod of tele1

to enter the retraction side of tele2.

Also, the bolt for tele3 opens the check valve 1 of selector valve ass'y

via spool which leads the oil in the extension side of tele2 to the counter-

balance valve by way of the slide pipe of tele2, the check valve 2 of selector

valve ass'y for tele1, and the slide pipe of tele1.

Although the check valve in the counter-balance valve is closed at

this time, the spool is opened by pilot pressure from the retraction side

allowing the oil in the extension side to return to the tank.

This allows the tele2 to retract.

Although pressure is applied to the retraction side of tele1 at the

time, the tele1 will not be actuated because the check valve 1 of selector valve

ass'y is closed and the passage to the extension side of tele1 is shut o

And the tele3 also will not be actuated according to the same

reasons as in the tele1.

Tele3

Tele2

Tele1

Rod

After the set-screw is tightened with LOCTITE #2701

applied, hit with a punch at 2 places on the

circumference and leave it as it is for 1 hour.

Check valve 1

Spool

Bolt

Tele3

Selector valve ass’y

Slide pipe

Check valve 2

Piston

Apply"LOCTITE #638".

Pilot Pressure

Counter balance

Pressure

Oil

To tank

Check valve