Omponents, Aintenance – Wood’s Powr-Grip PT4FS10TAIR User Manual

Page 21

Rev 2.0/12-12

PT4HV11FAIR: #35141

ILT

OMPONENTS

AINTENANCE

Tilt Actuator

Tilt motion is accomplished using an air-powered linear actuator. Since the tilt actuator is prelubricated,

no additional lubrication is required under normal circumstances. The tilt actuator is equipped with

several adjustable features that are set at the factory and should not need readjustment. However, in the

event that adjustments are required, proceed as follows:

Tilt Speed Valves

The tilt speed valves located at each end of the tilt actuator control the speed of actuator movement.

Speed is adjusted independently for each direction of the actuator’s stroke, using an adjustment screw

located at the outside end of each speed valve, as follows:
1) Determine which direction of the stroke requires a speed adjustment, and identify the speed valve

governing speed in that direction: The speed valve at the

upper

end of the actuator controls

retraction

(load movement from upright to flat), whereas the speed valve at the

lower

end of the

actuator controls

extension

(load movement from flat to upright).

2) Determine which direction to turn the valve’s adjustment screw in order to produce the desired stroke

speed: To

reduce

the speed of the stroke, turn the adjustment screw

clockwise

. To

increase

the

speed of the stroke, turn the adjustment screw

counter

clockwise

Note: The standard setting for the

upper

speed valve is 2-1/2 turns counter-clockwise from full

clockwise, and the standard setting for the

lower

speed valve is 2-1/4 turns counter-clockwise from full

clockwise.

3) Check the stroke speed and repeat steps 1-2 as necessary to obtain the desired adjustment.

Tilt Stop Valves

Tilt stop valves are integrated in the ends of the tilt actuator to control the cushioning effect at each end
of the stroke. An adjustment screw is flush-mounted on the side of the actuator

directly opposite

from

each tilt speed valve, in order to adjust the cushioning effect, as follows:
1) Determine which end of the stroke needs to be adjusted, and identify the adjustment screw governing

the cushioning effect at that end: The

upper

screw controls the end of the

retraction

stroke, whereas

the

lower

screw controls the end of the

extension

stroke.

2) Determine which direction to turn the adjustment screw in order to produce the desired cushioning

effect: To

increase

the cushioning effect, turn the adjustment screw

clockwise

. To

reduce

the

cushioning effect, turn the adjustment screw

counter

clockwise

Note: The standard setting for both

upper

and

lower

adjustment screws is 2 turns counter-clockwise

from full clockwise.

3) Check the cushioning effect and repeat steps 1-2 as necessary to obtain the desired adjustment.

Tilt Master Valve

The tilt master valve controls airflow to the tilt actuator, in order to set the maximum stroke speed in both

directions. This prevents the lifter or load from being damaged if anyone attempts to tilt the lifter when

the actuator is not completely pressurized. Such a condition may exist after shipping or storing the lifter,

or if the tilt control valve is operated while the air supply valve is in the “OFF” position.

CAUTION: Do

not adjust the tilt master valve unless there is clear indication it has come out of adjustment.

The standard setting for the master valve is 2 turns counter-clockwise from full clockwise, when viewed

from the end of the adjustment knob. The master valve must remain at the standard setting and should

not be adjusted, unless there is reason to believe that it has come out of adjustment.