MAC TOOLS MW250 Instrucciones de operaciones descargar pdf (Pagina 259)

TM 5-4310-452-14

4-100. MINIMUM PRESSURE AND SERVICE VALVE MAINTENANCE.

THIS TASK COVERS:

a. Removal c.Assembly

b Disassembly d.Installation

INITIAL SETUP

Equipment Conditions: Materials/Parts:

• Engine off. • One gasket

• Right door assembly open. • Three lockwashers

• Battery cables disconnected (see paragraph • Three preformed packings

4-57).

• Air discharge hose assembly removed (see Tools/Test Equipment:

paragraph 4-99). • General mechanic's tool kit

a. REMOVAL

WARNING

To prevent injury, ensure that system air pressure is relieved before removing minimum pressure

and service valve.

1. Disconnect air discharge tube assembly (2) from adapter (20) and elbow (1).

2. Remove adapter (19) and preformed packing (20) from valve body (6). Discard preformed packing,

3. Remove elbow (17) and nipple (16) from service valve manifold (3).

4. Remove 3 capscrews (13), lockwashers (14), and flatwashers (15) from frame and service valve manifold (3).

Discard lockwashers.

5. Remove service valve manifold (3) from frame.

b. DISASSEMBLY

1. Remove 4 capscrews (5), valve body (6), and gasket (4) from service valve manifold (3). Discard gasket.

WARNING

Spring is held under tension by cover. To prevent injury, loosen capscrews one full turn each,

one turn at a time, until they are removed.

2. Remove 4 capscrews (12), cover (11), spring (9), flatwasher (10), and piston (7) from valve body (6).

3. Remove 2 preformed packings (8) from piston (7). Discard preformed packings.

4. Remove 3 pipe plugs (18) from service valve manifold (3).

c. ASSEMBLY

1. Install 3 pipe plugs (18) in service valve manifold (3).

2. Install 2 new preformed packings (8) in grooves on piston (7).

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MAC TOOLS MW250 Instrucciones de operaciones Pagina 259