WOOD'S POWR-GRIP POWER TILT, Процедура

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TST-020 PT-AIR
– REV. 2017-246
Page 12 of 14
Perform a vacuum test.
If the vacuum level still does not reach a sufficient level
(>16" Hg. [54 kPa]) remove the muffler (unscrew
counter-clockwise) from the venturi assembly to
determine if a restriction exists. (See
FIGURE 12
.)
Repeat the vacuum test.
If the lifter does pull sufficient vacuum (> 16" Hg. [54
kPa]) replace the muffler.
If the lifter still does not pull sufficient vacuum replace
the venturi.
ACTUATOR TILTS AFTER STOPPING:
If, when tilted to a position, the actuator continues to move or begins to move back towards its
original position, the issue will typically be with the tilt control valve or the flow valves mounted to the
actuator. The exception to this would be if the internal seals of the actuator have worn to the point of
leaking across the seals.
The flow valves (
12A
and
12B)
are mounted directly to the actuator
ports. The flow valves should be checked first.
The flow valves may leak past the seals that allow the valves to
pivot. When this happens, air can typically be felt along the
seams of the collar/body of the flow valve. With the air supply
valve open, tilt the lifter to the position where it drifts and check to
see if air can be felt leaking around the body of the flow valve.
Note: If the drift causes actuator to retract (pad frame moving to
flat position) the upper flow valve is indicated. If the drift causes
actuator to extend (pad frame moving to vertical position) the
lower flow valve is indicated.
Since this is a pressure port, a soap and water solution can be
used to check for leaks. Spray a small amount of soapy water
around the flow valve that is indicated by the direction of the drift.
Bubbles will indicate a leak.
Replace any flow valve determined to leak.
If it is determined that the flow valves are not the cause, the tilt
control valve (
12C ) should be checked.
FIGURE 12
FIGURE 12
12B
12A
12C