TM 5-3810-307-24-1-1
ENGINE
DESCRIPTION
The AT422T crane is equipped with the Cummins
The cylinder is connected by linkage to the engine
B5.9-190 diesel engine. This manual does not
fuel injection pump throttle lever.
include detailed information on the engine itself. A
separate manual, TM 5-3810-307-24-2, prepared in
The engine and its components are enclosed in a
detail by the engine manufacturer, is supplied with
hood assembly with a grill in the front and rear of the
the crane.
However, a short description and
hood for adequate air circulation. Access to the
maintenance of certain engine-related components
engine is gained through side doors in the hood
are provided in this section.
assembly.
Engine speed is controlled mechanically from the
To aid in starting the engine in cold weather, a cold
carrier cab by a throttle cable connected to a foot
start system is provided. The system consists of a
pedal in the cab and the engine fuel injection pump
temperature switch, solenoid valve, starting fluid in a
throttle lever. From the superstructure cab, engine
pressurized container, atomizer, and connecting
speed is controlled pneumatically from a foot
tubing.
operated throttle valve in the cab to a throttle air
cylinder on the engine.
MAINTENANCE
ENGINE AND TRANSMISSION ASSEMBLY
Removal
a.
Start crane, set outriggers, and position boom to left side of carrier so hardware for deck plate over
transmission is accessible.
b.
Shutdown crane and position battery disconnect switch to OFF position.
c.
Disconnect drive lines from transmission, refer to Drive Lines Removal procedures.
d.
Relieve air system pressure by draining supply (depress pin in center of automatic drain valve), secondary,
and auxiliary air reservoirs.
e.
Drain hydraulic tank.
f.
Drain transmission case.
g.
Remove engine hood, refer to Engine Hood Removal procedures.
h.
Remove deck plate over transmission.
i.
Remove radiator and air cooler, refer to Radiator and Air Cooler Removal procedures.
j.
Disconnect engine/transmission electrical harness connector and four ground wires (located at front left
side of engine on carrier frame crossmember).
k.
Disconnect throttle cable (49, Figure 2-2-3) from bracket (57) and clamp (40) at air compressor.
