TM 5-3610-253-14
Control valve. A five-way valve used when changing knife. With lever in
c.
cutting position, the main drive clutch ram is connected to control block connection
P2K, and the P1 connection is connected to the clamp cylinder. With lever in knife
change position, the main drive clutch ram is connected directly to the P2 pump
line, and P1 pump line to the clamp cylinder is interrupted. This allows the knife
carrier to be-moved to a convenient position for a knife change without moving the
clamp.
d. Clutch ram. Uses hydraulic pressure from control block to engage a fric-
tion clutch on the drive pulley and causes rotation of main drive gear.
e. Clamp cylinder. Converts hydraulic fluid pressure to linear motion to move
clamp down. The cylinder operates in two stages to allow for fast downward movement
of the clamp and high clamping force.
Fluid under pressure enters the cylinder inlet port and travels down the center
section into the primary chamber, forcing the piston ram outward. At the same time,
a vacuum is created in secondary chamber and fluid is drawn from reservoir through
suction hose.
When the clamp contacts the material, fluid pressure to inlet port increases, the
valve closes and fluid is ported past the valve into the secondary chamber. The
pressure equalizes in both chambers and the force of the piston ram is increased.
5-12
