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HYDRAULIC SYSTEM - TM-10-3930-673-20-10036
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TM-10-3930-673-20-1 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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Chapter 2. UNIT MAINTENANCE INSTRUCTIONS
TM 10-3930-673-20-1
Item
Description
Hydraulic Oil Reservoir
Contains oil for the entire hydraulic system.
Hydraulic Oil Filter
Removes smaller harmful particles from the oil before the oil returns to the reservoir.
Main Control Valve
Located on the engine compartment bulkhead of the main frame (near back of
transmission). Operated by the hydraulic joystick control valve to control: boom hoist/
lower and extend/retract.
Attachment Control Valve
Mounted on the attachment and controlled by an electrical joystick. Controls the three
attachment functions: hoist/lowering, fork tilt, and fork sideshift.
Frame Tilt Valve
Mounted inside the console located to the right of the operator's seat. Controls the
tilting of the vehicle frame. Operated by frame tilt control lever.
Hydraulic Joystick Control Valve
Located on the side console in the cab. Controls the following boom functions: raise,
lower. extend, and retract.
Dual Gear Pump
Mounted to and driven by the transmission to supply hydraulic oil flow. This two
section pump supplies hydraulic fluid for the following functions: boom hoist, boom
extend, steering, brakes, and frame tilt.
Piston Pump
Mounted to and driven by the transmission. This pump supplies hydraulic fluid for the
following functions: attachment hoist, fork tilt, left and right fork control, and side shift
control.
Emergency Steering Pump and
Located in the vehicle frame forward of the transmission. Supplies 5 gpm of emergency
Motor
flow to the steering system whenever the starter-run control switch is on and there is a
loss of hydraulic oil pressure. The pump is driven by an electric motor.
Fork Sideshift Cylinders
Two cylinders controlled by the electric joystick. Both cylinders can be operated at the
same time to sideshift forks left or right or move forks together or apart. Cylinders can
also be operated individually.
Carriage Tilt Cylinder
Operated by the electric joystick. Moving the lever to the right causes the cylinder to
extend and the fork tips to lower. Moving the lever to the left causes cylinder to retract
and the fork tips to raise.
Attachment Cylinder
This cylinder is controlled by the attachment control joystick. When the lever is pushed
forward, the cylinder will retract. When the lever is pulled back, the cylinder will extend
and raise the attachment.
Boom Extend Cylinder
This cylinder is controlled by the hydraulic joystick. Moving the lever to the right
extends the cylinder. Moving the lever to the left retracts the cylinder.
Frame Tilt Cylinder
This cylinder is controlled by the frame tilt control joystick. When the lever is moved
forward, the cylinder extends and tilts the vehicle to the left. Moving the lever back
causes the cylinder to retract and tilt the frame to the right.
Boom Hoist Cylinders
Two cylinders controlled by the boom hoist control joystick. When the lever is moved
forward, the cylinders retract and the boom lowers. Moving the lever backward causes
the cylinders to extend and the boom to raise.
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