OPTIMIZER
TM
36
1.4.13 ARMS UP DECELERATION VALVE
The arms up deceleration valve automatically
decelerates the arms as they are raised to
the dump position. A cam bolted to the arm
pivot tube rotates as the arms are raised and
gradually depresses the valve spool, reducing
the flow of oil exiting the tube end of the arm
cylinders.
NOTE: The deceleration valve greatly
reduces impact on the arm assembly,
body structure, and hydraulic
components.
Location: Fitted to the underside of the body,
behind the arm pivot tube on the curbside.
Adjustment procedure
1. Remove the cap on the cushioning
adjustment screw located on the
armscylinder and unscrew
completely (see Figures 1.27 and
1.28).
2. Raise the arms up until they rest on
the arm stops.
3. Position the cam so there is 4 inches
between its boss and the body (see
Figure #1.29).
4. Tighten the retaining bolts of the
cam.
5. Lower and raise the arms while
running the engine at idle speed
and again while running the engine
at 1500 RPM.
NOTE: The arms should slow when they are
approximately 18 in. (45.72 cm) away from
the arm stops and gently come to rest
against the arm stops.
7. Attach a container to the forks and
repeat steps 5 and 6.
8. Remove the container from the
forks and repeat steps 6 and 7 until
the arms decelerate with an without
a container on the forks.
9. Tighten the locking setscrew.
ADJUSTMENT SCREW
WITHOUT CAP
FIGURE #1.27
CUSHIONING
ADJUSTMENT SCREW
6. If the arms reach the stops with
jarring impact or the arms stop
before reaching the arm stops:
a. Loosen one retaining bolt and
tap the cam in the required direction.
b. Tighten the retaining bolt of
the cam and repeat step 5.
FIGURE #1.28
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