3-14. Transmission Inspection and Service
transmission breather cap for cleanliness. -If
necessary, rinse the cap in clean diesel fuel or
kerosene and allow to drain dry before replacing.
Inspect the transmission for signs of oil leaks or
3-15. Hydraulic System
hydraulic fluid reservoir to be sure it is filled to the level
mark. Add oil if necessary. Visually inspect all hydraulic
lines, fittings, cylinders, and valves for leaks.
Be careful to inspect all brake and clutch cylinders for
leaks, since leaks in these areas could cause hydraulic
fluid to touch brake or clutch linings, thus causing the
brake or clutch affected to slip. Tighten any loose
connections. Report any other deficiencies to higher
Figure 3-7. Fuel tank drain plug.
determine maximum rated load for the length of crane
Using a load approximately equal to maximum rated load
for the conditions under which the crane is being
operated, lift the load a few inches above the ground.
See that clutches are adjusted and operating correctly so
that the load is lifted smoothly. Apply the appropriate
drum brake and see that the brake will hold the load
suspended. Lift and lower the boom, being careful not to
exceed rating plate maximum loads while so doing. Test
all hydraulically operated controls to be sure that they
Refer to the upper (crane) controls illustration, figure 2-
to the carrier (lower) controls illustration, figure
6-1. Turn on each internal cab light and external light, in
turn, and check for correct operation. Check headlights
in both the bright and dim conditions. Check directional
signals in both directions. Check the operation of the
two reel-mounted lights, one in each cab. Be sure dome
and dash board lights operate. See that floodlights are
adjusted so as to provide adequate lighting around the
entire working area.
Refer any deficiencies to
Depress the upper machinery horn button (fig. 2-36) and
Figure 3-8. Transmission inspection and service.