Vilter VSM 71-701, Operation And Service Manual

Page: 78 / 244

78
Service
4.00 CAPACITY AND VARIABLE
VOLUME RATIO CONTROL
ASSEMBLY
A) The following instructions are applicable for
most units equipped with optical gear mo-
tors built after 11-1-01. For units equipped
with potentiometer feed back gear motor
built after 5-1-95, see section 4.10. For units
built before 5-1-95, see Section 4.11.
B) On VSS units and dual gate VSM units, each
pair of volume or capacity slide valves are
mechanically connected and actuated to
move as a balanced pair. On VSR units
and single gate VSM units, there is only
one set of volume or capacity slide valves.
However, all information on removing the
volume or capacity control assemblies is
applicable to all units.
4.01 OPTICAL SLIDE VALVE
ACTUATOR REMOVAL
A) Follow appropriate lock out tag out proce-
dures to shut off the electricity to the micro-
processor. Disconnect cables from actuator.
B) Remove the side covers from the bracket to
gain access to the shaft collar.
C) Loosen shaft collar locking screw. Slide the
collar onto the actuator shaft. Lightly tighten
locking screw to hold it in place.
D) Remove the (4) #10 socket head cap screws
holding the bracket to the base plate.
E) Remove slide valve actuator from the unit.
Remove key from command shaft.
Collar
Locking Screw