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 18 of 29
TB 9-2320-279-34
c. Hold load stationary. Observe performance of crane structure and note any evidence of possible
failure. Lower load completely.
d. Thoroughly inspect crane in accordance with Appendix Aof TB43-0142.
2-5.3. Test Classification IV: Dynamic Functional Test.
a. Connect remote control. (Refer to TM 9-2320-279-10 or TM 9-2320-354-10).
b. Position boom parallel to ground. (See Figure 2-5 or 2-6). Extend boom to length given in Table
2-8 and attach test bad.
Table 2-8. Test Classification IV Conditions
●
Boom extension is measured on a horizontal line from center of turntable to center of the vertical hoist
line with bad attached.
●
*Test
c.
d.
e.
load is 100 percent of load rating.
Use the crane winch to raise test bad to a height of 18 inches (plus or minus three inches).
When load stops swaying, measure and record the distance from the load to the ground.
Disengage PTO and shutoff vehicle engine.
f. Allow the vehicle to sit undisturbed for 30 minutes. Again, measure the distance between the load
and the ground. Note any differences between the two measurements. The difference between the two
measurements should not be greater than 12 inches. If the difference is greater than 12 inches, determine
the cause, repair the crane, and retest.
2-13
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