INSTALLATION. Use the following procedure to install a
A. Pull beck on the boom hoist lever end observe that
both valve spools pop up.
new or overhauled velocity fun on the boom hoist cylin-
B. Lower the boom slowly until the boom hoist cylin-
ders bottom at the end of their stroke. Than return
1. Install the O-rings in the O-ring groove of the valve body.
the lever to the neutral position and observe the valve
Then install the valve on the cylinder end secure it with
spool. The valve spool should snap into the valve
body when the lever is returned to neutral.
2. Swing the boom over the side of the carrier.
C. Push the boom hoist lever forward slightly again and
observe the valve spool. The valve spool should pop
3. Test the operation of the valve es described in the fol-
out. Then return the lever to the neutral position.
lowing paragraphs. If the valve does not function as de-
The valve spool should snap into the valve body.
scribed in each step, it should be removed end inspected for
binding or replaced.
D. If the valve functions es just described, the valve is
functioning properly, and the machine can be re-
turned to service.
An assistant is required for the remaining step of this
procedure. The assistant should position himself so
that he can observe the left hand valve during the
test. The right hand valve can be observed by the
operator from the cab.