Labrie Pendpac WITTKE RETRO FL, Руководство оператора

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70 Operating the W
ITTKE
R
ETRO
F
L
TM
Deceleration Valve
The deceleration valve is located at the front of the body, under the front bulkhead. The valve’s
plunger contacts a cam bolted to the arm pivot tube. As the pivot tube rotates and the plunger is
pushed in by the cam, hydraulic flow through the valve is reduced. The deceleration valve is located in
the arm circuit, and controls the flow of hydraulic oil out of the arm cylinders when the arms are being
raised, thus reducing the arm travel speed.
It is imperative that the arms slow down before making contact with the rubber bumpers on the body.
If the arms were to contact the bumpers at full speed, serious damage to the bumpers, the arms or the
body would result.
I
MPORTANT
:
Never operate the W
ITTKE
R
ETRO
F
L
TM
with a non-functioning deceleration valve.
Adjusting the Deceleration Valve
The following procedure should be followed if it becomes necessary to adjust the deceleration valve.
A properly adjusted valve should come very close to stopping the travel of the arms just as they
contact the rubber bumpers so that no jarring impact is created.
To adjust the deceleration valve:
1.
Perform the arms full upward cycle up to the rubber bumpers on the body.
2. Mechanically depress the plunger on the deceleration valve all the way to determine the total
plunger travel.
3. Loosen the actuating cam on the arm pivot tube and rotate it so that it depresses the valve
plunger to within 1/8” of total inward travel.
4. Tighten the actuating cam.
5.
Run the arms initially at engine idle and then at 1500 engine rpm and note the arm deceleration.
Normal motion for the arms when the deceleration valve is properly adjusted would have them
starting to slow down when they are about 18” from contacting the rubber bumpers.