HYDRAULIC CONTROL MODULE (35). The hydraulic control module (35), located on the forward curbside of the
semitrailer, is used in conjunction with the APU for manual steering, gooseneck adjustments, and suspension
adjustments. Primary adjustments are made by operating valve handles in the five handle valve bank. Two other handles
operate the gooseneck isolation valve and the platform suspension shut-off valve.
PANEL COVER (36). The panel cover (36), closed during transport, is used to protect the hydraulic controls and gage
HYDRAULIC GAGE PANEL (37). The hydraulic gage panel (37) consists of a low steering pressure indicator light, a filter
condition indicator, and four pressure gages. One gage measures system pressure and the others monitor each of the
three legs of the suspension circuit (front curbside, front streetside, and rear). These instruments are used for monitoring
proper operation, for making steering and suspension adjustments, and for fault isolation and repair of the semitrailer
BOGIE ASSEMBLIES (38). The 10 bogie assemblies (38) support the platform assembly and form part of the
suspension, braking, and steering systems for the semitrailer. Each bogie assembly (38) has an axle assembly (39)
which houses an air brake assembly, parking and service brake chamber, two hub and drum assemblies, and two sets of
dual tire assemblies (40).
HYDRAULIC SUSPENSION CYLINDERS (41). A hydraulic suspension cylinder (41), mounted between each upper and
lower suspension arm of each bogie, enables the bogie assembly to act as a shock absorber and provides stability and
manual adjust ability for each axle assembly.
SNATCH BLOCK (42). A snatch block (42), recessed in the center of the beavertail (slanted portion of platform at rear of
semitrailer), is used for winching disabled payloads off the semitrailer.
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