TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 336 of 828

TM 9–2350–311–20–2

6–20

Change 2

6–6

PRESSURE SWITCH, HYDRAULIC

This task covers:

a.

Removal

b.

Installation

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Caps and plugs (item 7, Appx D)

Preformed packing (item 46, Appx G)

Equipment Condition

Discharge hydraulic pressure (para 6–3)

CAB POWER switch to OFF (TM 9–2350–311–10)

Vehicle MASTER switch to OFF (TM 9–2350–311–10)

CAUTION

All hydraulic lines and ports must be capped to prevent contaminants from entering the hydraulic

system and causing internal damage to hydraulic components.

NOTE

Dispose of hydualic fluid in accordance with local regulations.

a.

Removal

1

Disconnect tube nut (1) from reducer (2) and plug hydraulic line.

2

Disconnect connector (3).

3

Remove machine bolt (4), hex nut (5), and loop clamp (6).

4

Remove pressure switch (7).

5

Remove reducer (2) and preformed packing (8). Discard preformed packing.

b.

Installation

1

Install reducer (2) and new preformed packing (8) into pressure switch (7).

2

Install pressure switch (7) in loop clamp (6).

3

Secure loop clamp (6) with hex nut (5) and machine bolt (4).

4

Connect connector (3).

5

Remove plug and connect tube nut (1) to reducer (2).

6

Check hydraulic fluid level (para 6–2).

3

4

1

2

8

7

5

6