TM-9-2350-311-10

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

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 103 of 775

TM 9-2350-311-10

2-5

LEAKAGE DEFINITIONS - CONTINUED

b.

Class II. Leakage of fluid great enough to form drops but not enough to cause drops to drip from item being

checked/inspected.

c.

Class III. Leakage of fluid great enough to form drops that fall from the item being checked/inspected.

NOTE

M182 only: Leakage of 1 ml (approximately 25 drops) is permissible at the seal interface to the

variable recoil rods after five (5) rounds or 24 hours after firing.

2-6 DAMAGE DEFINITIONS

Damage definitions are as follows:

a.

Blowby. Powder markings beyond a sealing surface.

b.

Burrs. A raised portion, restricting the entrance of a part, component, or assembly.

c.

Cracks. A narrow break or separation in material.

d.

Gouges. A groove or cavity in a sealing surface that cannot be repaired.

e.

Nicks. An indentation caused by object(s) striking the material.

Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES

FOR M109 SELF-PROPELLED HOWITZER

Item

No.

Interval

1

2

Before

Before

Location

Item to Check/

Service

Vehicle

Subfloor Drain

Plugs and Access

Cover Plates

DRIVER

2-18 Change 2

Crewmember

Procedure

DRIVER

Walk around vehicle. Check for any obvious fluid

leakage, missing items, or damage to equipment.

Do not ford if any drain plugs are missing to

prevent water damage to equipment.

Check all drain plugs (1) and cover plates (2) for

installation.

Not Fully Mission

Capable If:

Any Class III oil,

fuel, or coolant

leak found.

Any drain plug

(1) or cover plate

(2) is missing.