TM 5-2420-230-10
(20) Place PARK BRAKE lever in ON position (Para 4-11) and lower vehicle from jack.
Ensure you do not catch your hands between extension bar and other parts of IHMEE. Failure to
comply may result in injury or death to personnel.
Vehicle must be taken to Unit maintenance to have wheel nuts accurately tightened to
475 to 525 lbf/ft (644 to 712 Nm) at first opportunity. Wheel nuts must also be check-tightened to
a torque of 475 to 525 lbf/ft (644 to 712 Nm) after 60 mi. (100 km) of driving. Failure to comply
may result in injury or death to personnel, and/or damage to equipment.
Vehicle must be taken to Unit maintenance to have rim nuts accurately tightened to 295 lbf/ft
(400 Nm) after 60 mi. (100 km) of driving.
When using an extension bar, it is easy to exceed correct torque figures. Use extension and breaker
bars with extreme caution to prevent over- or undertightening of wheel nuts. Failure to comply may
result in damage to vehicle.
NOTE
Table 3-5 shows approximate torque values resulting from several combinations of operator weight
and extension bar lengths.
Tighten wheel nuts in order illustrated.
(21) Use extension bar, 3/4-in. breaker bar, and 33 mm socket to tighten wheel nuts to 475 to 525 lbf/ft
(644 to 712 Nm).
Combined Length of Breaker
Operator
Resulting
Approximate Torque
and Extension Bars
Weight
Force
Applied
43 in. (1 100 mm)
143 lb. (65 kg)
143 lbf (637 N)
516 lbf/ft (700 Nm)
37 in. (950 mm)
165 lb. (75 kg)
165 lbf (735 N)
516 lbf/ft (700 Nm)
32 in. (800 mm)
198 lb. (90 kg)
198 lbf (880 N)
516 lbf/ft (700 Nm)
27 in. (680 mm)
231 lb. (105 kg)
232 lbf (1 030 N)
516 lbf/ft (700 Nm)
3-69
Change 1