THEORY OF OPERATION
This section contains information relative to the principles of operation for the M9 ACE with Hydraulic Blade Folder
and Track Tensioner (HBF-TT). The general functional description of the vehicle and the HBF-TT system is contained
in this section. Maintenance personnel should be familiar with the principles of operation of these systems before
working on or troubleshooting this system. A more thorough understanding of the hydraulic system and electrical
system can be obtained by referring to TM 5-2350-262-20, Vehicle Wiring Diagram and TM 5-2350-262-20, Vehicle
The suspension system consists of tracks, roadwheels, arms, drive sprockets, rotary actuators, and bump stops.
The suspension system components used in the HBF-TT system are described below.
TRACK ADJUSTING CYLINDERS
The track adjusting cylinders (Figure 1) control the track tension. The track adjusting cylinders (Figure 1) can be
controlled by a control lever in the operator's compartment.
Track Adjusting Cylinders.