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Page Title: Chapter 16. HYDRAULIC SYSTEM MAINTENANCE
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TM 10-3930-673-34
16
HYDRAULIC SYSTEM MAINTENANCE
Para
Contents
Page
Section I. Description and Data
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1
Section II.  Hydraulic System Maintenance Procedures
Tandem Gear Pump Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Control Valve Assembly Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attachment Control Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Priority Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frame Tilt/Brakes Relief Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frame Tilt Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frame Tilt Cylinder Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carriage Tilt Cylinder Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom Assembly Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inner Boom Replacement/Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intermediate Boom Replacement/Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outer Boom Replacement/Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom Pivot Pin Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wear Pads Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extend and Retract Chains Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom Extend Cylinder Replacement/Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6K Fork Sideshift Cylinders Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10K Fork Sideshift Cylinders Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom Hoist Cylinder Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Joystick Control Valve Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attachment Cylinder Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Hoses Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section I.
DESCRIPTION AND DATA
Hydraulic system maintenance procedures not covered in this chapter can be found in TM 10-3930-673-20.
16-2. PRINCIPLES OF OPERATION
a. System Description. The hydraulic system of the forklift supplies a controlled flow of filtered hydraulic
oil for operation of the boom, carriage, forks, and frame tilt functions. Directions used in the system
descriptions are as the reader is sitting in the operator's seat.
Principle components of the hydraulic system are detailed on pages 16-2 through 16-6. See the hydraulic
schematics at the end of this manual for the connections among the components.

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