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Boom Extend System - TM-10-3930-673-340580
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TM-10-3930-673-34 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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Fork Sideshift System
TM 10-3930-673-34
with the greatest load to be sensed by the pump. As the load of the attachment control valve changes, the
position of the swash plate angle changes in the piston pump.
When the electric joystick is in the center position, all solenoids of the attachment control valve are de-
energized and centering springs keep the control valve spools in the center (hold) position.
By moving the electric joystick forward, the top left solenoid is energized. The solenoid allows pilot oil to flow
through the solenoid and push the spool in the top section towards the right of the machine. The main flow of
hydraulic oil goes through the top section, pilots open a load check poppet and allows oil to flow from the work
port to the attachment cylinder. Oil enters the left (rod end) port of the cylinder. The oil pilots open the
counterbalance valve on the head end of the cylinder, allowing oil to flow from the head end of the cylinder.
The cylinder retracts, lowering the attachment. Oil from the cylinder enters the work port of the top section of
attachment control valve and is directed to the return circuit where it is sent to the hydraulic reservoir
through the hydraulic filter.
The load compensating check valve moves up and down as the load and pump pressure change. If the load
increases, the pressure in the work port increases and pushes on the spring side of the load compensating
check valve to block oil passage to the work port. At this short instance, the load compensating check valve is
operating as a load hold check valve. Increased work port pressure is also sent to the piston pump through the
sensing line.The pump output pressure increases sufficiently to maintain the 400 psi (2758 kPa) pressure
differential. The increase in pump pressure is now sensed at the smaller end of the load compensating check
valve and the valve moves up allowing oil flow to the work port again.
If the electric joystick is moved rearward, the top right solenoid is energized. The oil flow through top section
of the attachment control valve is similar to the retract function but the oil flow to the cylinder is reversed. Oil
pressure unseats the ball check in the counterbalance valve on the head end and forces the rod out of the
cylinder. The cylinder extends and raises the attachment.
The maximum pressure in all the circuits of the attachment control valve is controlled by the maximum
discharge of the pump which is 3300 psi (22753.5 kPa).
f. Carriage Tilt System. The carriage tilt function is also controlled by the electric joystick and the
attachment control valve. Hydraulic oil from the piston pump flows through the control valve the same as for
the above attachment system.
Move the electric joystick to the left and the second from the top right solenoid is energized. The solenoid
allows pilot oil to flow through the solenoid and push the spool in the second section towards the left of the
machine. Oil flows through the second section, pilots open a load compensating check valve and flows from
the work port to the rod end ports of both carriage tilt cylinders. The load compensating check valve operation
is the same as described in the attachment system. Oil pressure unseats the ball check in the counterbalance
valve on the rod end and pushes the cy1inder piston in each cylinder. Oil in the head end of the cylinder flows
from the head end port and back to the attachment control valve. The cylinder retracts which raises the fork
tips. Oil from the tilt cylinders is directed to the attachment control valve return circuit and back to the
hydraulic reservoir through the hydraulic filter.
If the electric joystick is moved to the right, the second from the top left solenoid is energized. The oil flow
through the second section is similar to the fork tips raise function but the oil flow to the tilt cylinders is
reversed. Oil flows to the head end of the tilt cylinders and pilots open the counterbalance on the rod end of
the cylinders. Oil is allowed to flow from the rod end and back to the return circuit of the attachment control
valve. The cylinders extend and lower the fork tips.
A port relief valve set at 4000 psi (27580 kPa) is connected to the rod end of the tilt cylinders. The relief valve
protects the hydraulic lines from bursting when shocks or spikes are encountered on the rod side of the
cylinder.
16-5

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