o Flow Control Valve - regulates the flow of hydraulic fluid.
Manually adjust it to achieve the desired speed of the conveyor
and stacker systems.
o Conveyor, Ballistic Shield, and Stacker Directional Valves -
Accomplish this by positioning the internal spool, which
determines the direction of rotation.
The valves may be
electrically operated by the control switches or manually
operated by pressing the buttons on either side.
o Temperature Gage - displays the temperature of the hydraulic
fluid in the reservoir, as monitored by the temperature
The temperature of the hydraulic fluid in the
reservoir should not exceed 160F.
o Level Gage - displays the level of the hydraulic fluid in the
reservoir, as monitored by the fluid level transmitter. The gage
is graduated from empty (E) to full (F) in 1/4 tank increments.
The fluid level in the reservoir should not measure less than
Backup Hydraulic System Components.
Use the following components, shown in Figure 3F, to engage the backup
o Manual Hydraulic Pump - when manually activated, provides the 125
to 150 psi to engage the backup hydraulic pump clutch system to
the main engine. Measure the pressure generated by this pump by
a gage attached to it.
o Backup Hydraulic Circuit Dump Valve - when opened, permits the
backup hydraulic pump to disengage from the main engine. For the
backup pump and hydraulic circuits to function, you must close
o Selector Valve - determines which hydraulic pump circuit is to be
When you push the valve handle in, you select the
primary hydraulic pump circuit. When you pull the handle out,
you select the backup hydraulic pump circuit. For the hydraulic
system to function, the selected hydraulic pump must also
Backup operation capabilities are provided for many of the M992 systems;
the hydraulic system is one of them. The next part of this subcourse
describes how to operate the hydraulic system in the event of a hydraulic
or electrical power loss.