TB-9-2320-279-34
TECHNICAL BULLETIN; TEST PROCEDURES
DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE LEVELS LOAD TESTING HEAVY EXPANDED MOBILITY TACTICAL TRUCK (HEMTT) VEHICLE CRANES
TB-9-2320-279-34 - Page 14 of 29
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.
Table 2-6. Test Classification IV Conditions
●
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.
c .
d.
e.
Attach test load to crane hook.
Use crane winch to raise test load to a height of 18 inches (plus or minus three inches).
When test load has stopped swaying, measure and record distance from load to ground.
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 12 inches. If difference is greater than 12 inches, determine the cause, repair crane, and
retest.
2-9
Back to Top
