HYDRAULIC SYSTEM - continued - TM-10-3930-673-20-10037

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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