Unic URW295CUR, Workshop Manual

Page: 77 / 155

Tele1
Tele2
Tele3
(5) When Telescoping Cylinder3 extends
Bolt
Tele3
Rod
１
４
－５
Rod
Counter
Counter balance
balance
valve
Pressure oil opens the check valve in the counter-balance valve to
enter the cylinder rod of t
ele1 and lows through the slide pipe to reach
the check valve 2 of selector valve ass'y.
Since the slide pipe of tele1 is pulled by piston immediately before the
tele1 is fully extended which in turn opens the check valve 2 of selector
valve ass'y to lead the pressure oil to the extension side of tele2.
Pressure oil entered the extension side of tele2 lows through the
slide pipe to reach the check valve 2 of selector valve ass'y.
Since the slide pipe of tele2 is pulled by piston immediately before the
tele2 is fully extended which in turn opens the check valve 2 of selector valve
ass'y to lead the pressure oil to the extension side of tele3.
Simultaneously,oil in the retraction side of tele3 lows through the
dual cylinder in the cylinder rod of tele3 to enter the extension side of tele2,
hen it lows through the dual cylinder and further through the dual
cylinder in the cylinder rod of the tele1 to return to the tank.
This allows the tele3 to extend.
Since the check valves 1 of selector valve ass'y of tele1 and tele2 are
closed at this stage, the passages of extension side for tele1 and tele2 are
shut off.
Both tele1 and 2 will not be actuated because no oil is remained in
the retraction side of tele1 and 2 as the tele1 and 2 are fully extended.
How oil flows when tele3 is extended
Pipe for cord reel
After the set-screw is tightened with LOC TITE #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".
Spool
Selector valve ass’y
Check valve 1
Check valve 2
Check valve 2
Slide pipe
Slide pipe
Piston
Piston
Check
valve
Pressure Oil To tank
Rod
Selector valve ass’y
Check valve 1
Bolt
Tele3
valve
Courtesy of Machine.Market