Pipe for cord reel
4) When Telescoping Cylinder2 retracts
1
4
-4
How oil flows when tele2 is retracted
Pressur
e oil lows 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 off
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
Pressure
Oil
To tank
Check valve
Spool
Rod
Piston
Slide pipe
Check valve 2
Bolt
Tele2
Selector valve ass’y
Check valve 1
Counter balance
valve
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