4000A and 4000B Trailers
Connecting lines and fittings
Foot-lever actuated drum/shoe types of park-
These two models are very similar. Figure 3-19
ing brakes are located on the two rear wheels.
shows the model 4000A. It is a four-wheel,
Large foot assemblies, which can be manually
mobile, hydraulically controlled, self-supporting
lowered, are provided to give the stand maximum
unit. The trailer consists of a main frame
stability and support when required. The tie rods
supported by four wheels, a lift linkage system,
that hold the rear wheels fore and aft, and those
an upper frame holding two cradle assemblies,
that control tow bar steering of the front
and a tube and rail assembly. A detachable,
wheels, are configured so that they can easily
telescopic tow bar provides a means of manually
be disconnected. This permits all four wheels
steering or towing the trailer. Some trailers may
to be manually positioned for maximum maneu-
be equipped with a tow coupling on the rear.
verability in close quarters.
The hydraulic system consists of the following:
All four wheels are attached to the main frame
Four hydraulic frame lift rams that raise
by hydraulically controlled wheel support arms,
and lower the upper frame assembly (rails)
operated by wheel lift rams. A ratchet and pawl
system is provided on the rams to safely lock the
Four (two on some models) wheel lift rams
rams, mechanically and automatically, as they
that raise and lower the main frame
extend. Pawl handles on each wheel lift cylinder
must be actuated and held to permit the rams to
Two hand pumps with release valves that
retract.
operate either the lift rams or the wheel rams
The wheel lift rams permit raising or lowering
A two-position selector valve labeled LIFT
the main (lower) trailer frame. The main frame
CYLINDER and WHEEL CYLINDER
can be lowered right to the deck, provided the four
manual foot assemblies are all the way up. The
main frame full up position gives maximum
A hydraulic fluid reservoir (two on some
ground clearance and is used when towing or
models)
Figure 3-19.-4000A engine removal/installation trailer.
3-16
