Section III. GENERAL MAINTENANCE INSTRUCTIONS

TM 5-2420-224-34

Section III. GENERAL MAINTENANCE INSTRUCTIONS

OVERVIEW

This section describes general maintenance instructions that apply to all parts of this manual.

To avoid repetition, these procedures will not be described in specific maintenance sections.

GENERAL REMOVAL INSTRUCTIONS

Work Required. Remove only those parts needing repair or replacement. Do not disassemble a

component any further than needed.

Preparation. Before removing any part of the electrical, hydraulic, or air systems, make certain

system is not energized or pressurized. Disconnect battery cables. Relieve all pressure from air

system. Make sure brakes are locked and that all controls are in OFF position before starting

any removal procedure.

Removal. Make sure there is enough clearance to remove part. Disassemble adjacent parts as

needed to provide working clearance.

Lifting. Always use chain hoist, jack, or other aid when lifting heavy parts. Make certain load

limit of lifting device exceeds weight being lifted. Position and rig lifting device before

disconnecting part for removal.

Identification. Tag or mark all similar parts, such as electrical leads, before disconnecting and

removing such parts. This will make proper assembly easier. Be sure to identify mating ends of

electric lines, hydraulic lines, and air tubes as they are disconnected.

Position of Valves. Before removing valve handles, mark or diagram their positions when open

and closed. This will help during assembly.

GENERAL DISASSEMBLY INSTRUCTIONS

Cleanliness. Work area must be kept as clean as possible. This will prevent injury or

contamination of internal parts. This is especially true for valves, cylinders, and other hydraulic

or air system parts.

Expendable Parts. As indicated in this manual, all gaskets, packings, and seals removed during

repair must be discarded and replaced with new parts. These items are usually damaged during

removal. In the same way, all lockwire, cotter pins, and like items must be replaced at time of

assembly.

Removing Seals. When removing gaskets, packings, or seals, do not use any metal tool that

will scratch the surfaces next to these items.

Disassembly. Before disassembly of any item, study the illustration carefully. Note relationship

of internal parts. Knowing details of a component will speed up disassembly and assembly and

will help avoid mistakes.

Parts Protection. To prevent moisture and dirt from entering open housings, lines, and other

openings, apply protective caps and plugs as soon as possible after disassembly. Wrap all

removed parts in clean paper or coat parts with solid lubricant preservative.