TM-9-2350-358-BD

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6

TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE

MARCH 1994

TM-9-2350-358-BD - Page 236 of 343

TM 9-2350-358-BD

11-12. HYDRAULIC HIGH-PRESSURE TUBING REPAIR (PERMASWAGING) - CONTINUED

References:

TM 9-2350-314-20-2-2

Procedural Steps:

NOTE

Effective, leak-proof permaswaging depends on tube ends being square, deburred and very clean,

and precise marking of tubing to avoid twisting of line (stress) and centering inside fitting(s).

1.

Long Axis marking.

Using a marking pen and a ruler, draw a straight line on the tubing, starting in the undamaged

area, through to the damaged section, into the other undamaged area, as shown.

2.

Determine the repair method required.

A.

Pinhole or circumferential crack not exceeding 0.30 inch, perform step 3 and steps 7 thru 13.

B.

Pinhole, circumferential or longitudinal crack exceeding 0 30 inch, perform step 4 and steps 7 thru 13.

C.

Repair of leaking tee or elbow (permanent tube connection type), perform step 5 and steps 7 thru 13.

D.

Repair leaking end fitting, perform step 6 and steps 7 thru 13.

3.

Make one or two cuts as necessary to enable removal of damaged section.

If two cuts are required, the distance

between them shall not exceed 0.30 inch.

PIN HOLE AND CIRCUMFERENTIAL CRACKS NOT EXCEEDING 0.30 INCH

11-18