Stanley MSD 1000 Safety, Operation & Maintenance Manual page 83

SPEED VALVE ADJUSTMENT
continued
The following procedure is recommended by Stanley
LaBounty for speed valve adjustment on any fully
assembled and installed Saber Series Hydraulic
Cylinder. Prior to making any adjustments to the
valve, verify whether the valve is operating properly
by checking the following operational conditions. For
condition "a" (as described on page 5-43), install a
pressure gauge into the MAZ test port to see if the
pressure drops to zero when fully closing the shear
jaw. For condition "b" (as described on page 43),
compare the closing speed of the shear to the open-
ing speed. If the closing speed is equal to, or less
than the opening speed, then the valve is shifting
properly into the regenerative speed mode.
This procedure requires more than one individual
in close proximity to the shear and shear
operation. Keep within sight when operating the
shear. Ensure all persons are clear before cycling
the shear. This procedure requires adjustments
to be performed with the hydraulic system
pressurized.
1. Position the attachment on fi rm, level ground so
the speed valve is easily accessible.
2. Turn the excavator off and release all hydraulic
pressure to the shear by working the excavator
controls in all directions. Be certain to relieve the
air pressure in the excavator reservoir. Refer to the
excavator operator's manual for proper excavator
hydraulic pressure relief procedures.
3. Slowly remove the plugs from the MBS port and
the MAZ port on the speed valve. Turn the plugs
counterclockwise until fl uid begins to seep from the
port. Allow the fl uid seepage to slow before con-
tinuing.
4. Continue to slowly turn the plugs counterclock-
wise, pausing momentarily in 1/4 to 1/2 turn in-
tervals until the plug is removed. This ensures all
residual pressure is relieved from the speed valve.
Refer to the illustration on page 5-44 of this section
MSD SABER SERIES SHEARS
for port locations. Place a drainage basin below the
ports to capture all escaping fl uid.
5. Install the test fi ttings supplied with the Stanley
LaBounty Digital Gauge Kit, P/N 169832 into the
MBS and MAZ ports on the Speed Valve. If the MAZ
port is too diffi cult to access for test fi tting instal-
lation, the MX port on the speed valve may also be
used to monitor valve pressure.
6. Attach the digital gauge and pressure line to the
MAZ test port on the speed valve. If two gauges are
available, install the second digital gauge and pres-
sure line to the MBS test port on the speed valve. If
only one digital gauge is available, the MBS test port
on the speed valve must be plugged at this time
with the MBS port plug. Mechanical, liquid fi lled dial
gauges may be used to monitor pressure in place of
the digital gauges.
7. Reset the main spool valve adjustment by loosen-
ing the 19mm lock nut on the main spool valve, and
turning the 6mm socket head adjustment screw
counter-clockwise. Continue to turn the socket
head adjustment screw until the end of its travel is
reached, then turn the adjustment clockwise until
you feel the spring tension of the main spool, af-
ter tension is felt turn the adjustment one full turn
clockwise. Re-tighten the 19mm lock nut.
8. Loosen the 19mm lock nut on the pilot valve,
but DO NOT turn the 6mm socket head pilot valve
adjustment screw.
9. Have a co-worker restart the excavator. Check for
leaks in the test fi ttings by using a piece of card-
board or other rigid material. Repair all leaks before
proceeding.
NOTICE
Note that turning the pilot valve adjustment screw
past the locking nut could cause severe damage to
the pilot valve.
Maintenance Section 5 Page 45