ARMY TM 5-5420-212-23
MARINE CORPS TM 08676A-23/2
2-4 REPAIR PARTS
Repair parts are listed and illustrated in the Repair Parts and Special Tools List (TM 5-5420-212-23P) covering all
maintenance for this equipment.
Section III. SERVICE UPON RECEIPT
2-5 SERVICE UPON RECEIPT OF MATERIEL
All service upon receipt is performed by the bridge crew (Operator level). Refer to TM5-5420-212-10-1, Chapter 3
Section IV. PREVENTIVE MAINTENANCE CHECKS & SERVICES (PMCS)
Death or serious injury will occur if PMCS is not carried out at the intervals stated in Table 2-2 by
a person familiar with the use and application of all MGB components.
Before any inspection is done all components must be cleaned by high pressure hose or water and sponge.
Before performing the preventive maintenance checks and services detailed in paragraph 2-11 it is important
that the inspector is familiar with the use and application of all MGB components (Chapter 1 section II) and the
information contained in paragraph 2-7 Corrosion and Cracking and paragraph 2-8 Protective Finishes.
2-7 CORROSION AND CRACKING
An early detection of cracks in highly stressed components is essential any delay may result in the complete
failure of a component. Cracks less than 3/8 in (10 mm) long must be clearly marked and observed. Cracks over 3/8 in
(10 mm) long must be repaired. Any cracks or damage to the paint and/or zinc protective coating must be reported
immediately and the necessary repair action taken.
If bituminous black material is oozing from a component, with the exception of around seal
plates, the component must be closely examined. This may indicate a serious crack which
would require repair at Depot Maintenance.
The inspection of dismantled components should be carried out visually in great detail and the designated
inspector should, in particular, look for the following defects:
Stress Corrosion Cracks. This form of corrosion, inter-crystalline in nature, occurs under the influence of
static stress and may occur within the heat affected zones of welded components. It leads to mechanical failure
generally in the form of cracking (fig. 2-1).
2-2 Change 1