Arms Down Work Section; Arms Down Deceleration Valve (Optional) - Wittke StarLight Maintenance Manual

3/16"
72
A D
RMS OWN
Designed to protect the arm hydraulic circuits, the arms down
work section is equipped with a work port relief valve in the arms
down outlet port only and is preset to 1000 psi.
T
AMPERING WITH THE WORK PORT RELIEF VALVE MAY CAUSE
SERIOUS DAMAGE TO THE ARMS CIRCUIT AND VOID WARRANTY
Location:
Main hydraulic valve bank, on the front header of the body.
A D
RMS OWN
(
OPTIONAL
The arms down deceleration valve automatically decelerates
the arms as they are lowered. A cam bolted to the arm pivot
tube rotates as the arms are lowered and gradually depresses
the valve spool, reducing the flow of oil exiting the shaft 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 street side.
Adjustment procedure:
1. Lower the arms down as far as possible.
2. Position the cam so it depresses the spool of the
dceleration valve until there is approximately 3/16 inch
94.75 cm) of the spool still exposed.
3. Tighten the retaining bolts of the cam.
4. Raise and lower 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 inches (45.72 cm) away from being lowered and
gently come to rest at the bottom of their travel.
5. If the arms reach the bottom of their travel with jarring
impact or the arms stop before being fully lowered:
W S
ORK ECTION
CAUTION
D
ECELERATION
)
.
V
ALVE
Part #: 90309