1/4-TON TRAILER: M416 SERIES
Section I. CLEANING PROCEDURES
21-1. Cleaning Procedures.
a. Wash the framerail structures thoroughly to
remove mud, dirt, and rust. Use of a high pressure
washer will facilitate this operation.
b. Allow at least four hours for vehicle drying.
When cleaning, water may be discharged in
Additional drying time may be required if unfavorable
excess of 1200 psi (8274 kPa) from high
weather conditions exist. Compressed air may be used
pressure water equipment. Serious injury
to speed up the drying process.
could result. Eye protection must be worn
to prevent injury.
c. Prime and paint those areas showing bare metal.
Allow painted areas time to dry before rustproofing.
Steam cleaning will not be used.
Section Il. RUSTPROOFING PROCEDURES
needed, the vehicle can be resprayed to reach proper
21-2. Rustproofing Procedures.
b. Spraying Pressure. The rustproofing compound
should be applied to sheet metal and structural
members in even coats. Spraying pressure should be as
Do not spray any portion of moving compo-
low as possible while maintaining an even spray pattern.
An acceptable starting point is 40 psi (276 kPa), but
nents, rubber bump stops, brakedrums,
brake backing plates, parking brake linkage,
adjustments may have to be made due to temperature
tires, and electrical components. Cover all
changes and differences in rustproofing compound.
Using too much pressure will waste compound by
areas with paper where necessary.
causing overspray and excessively thick coatings.
There are areas where a 10 mil wet film
(1) Use short rigid tool to completely cover the
thickness cannot be obtained without
trailer underbody, including all open areas.
wasting a large amount of compound. In
those areas, complete coverage of the
(2) Use 90 degree short tool to completely
surface area is necessary at whatever
cover the inside of the trailer fenders.
thickness is obtainable.
(3) Insert long rigid tool into the front of the
closed section of the drawbar as far as possible, then
a. Dry Film Thickness Requirements. A five mil dry
slowly withdraw tool while spraying.
film thickness is required for adequate rustproofing
protection. A 10 mil wet film thickness is required to
(4) Use short rigid tool to completely cover the
inside portions of all siderails and crossmembers.
obtain a minimum five mil dry film thickness. If