Pressur
e oil lows through the dual cylinder of cylinder rod of tele1
and through the dual cylinder of tele2 to enter the retraction side of tele3.
Also, oil in the extension side of tele3 lows by way of the selector
alve of tele2, the slide pipe, the selector valve of tele1, and the slide pipe
in that order to reach the counter-balance valve.
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 to return to the tank.
This allows the tele3 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 of tele1 is closed and the passage to the extension side of tele1 is shut
off.
And the tele2 also will not be actuated according to the same
reasons as in the tele1.
How oil flows when tele3 is retracted
Counterbalance
valve
Pilot Pressure
Pressure
Oil
To tank
Checkvalve
Spool
T
ele3
Tele1
Tele2
Pipe for cord reel
Counterbalance
valve
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.
Piston
Apply"LOCTITE #638".
Check valve 2
Selector Valve Ass’y
Bolt
Tele3
Check valve 1
Spool
Rod
Rod
Rod
Piston
Piston
Slide pipe
Slide pipe
Check valve 2
Selector Valve Ass’y
Check valve 1
Bolt
Tele3
1
4
-6
(6) When Telescoping Cylinder3 retracts
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