Test Classification IV: Dynamic Functional Test.

TB 9-2320-279-34

2-4.4. Test Classification IV: Dynamic Functional Test.

a. Position boom in line with centerline of vehicle. Extend and raise boom as given in

Table 2-6. Test Classification IV Conditions

Grove

*Boom Extension

Initial Boom

** Test Load

Crane

(Load Radius)

Position

Pounds

Model

Feet (`) and Inches (")

(Elevation)

M977

19'

2,500 Lbs.

Parallel to Ground

M984

11'10"

12,000 Lbs.

***

M985

16'6"

5,400 Lbs.

Parallel to Ground

*Boom extension is measured on a horizontal line from the center of the turntable to the center of

the hoist line with load attached.

**Test load is 100 percent of load rating.

***Raised boom so that sensor plate covers only top proximity switch (see Figure 2-3).

b. Attach test load to crane hook.

c. Use crane winch to raise test load to a height of 18 inches (plus or minus three inches).

d. When test load has stopped swaying, measure and record distance from load to

ground.

e. Disengage Power Take Off (PTO) and shut off vehicle engine. (Refer to TM 9-2320-

279-10).

f. Allow vehicle to sit undisturbed for 30 minutes. Measure distance between load and

ground again. Note any difference between measurements. The difference in the two

measurements should not be greater than 1 inch. If difference is greater than 1 inch,

determine the cause, repair crane, and retest.

Change 2

2-9