TM-5-2330-325-13-P

SEMITRAILER, MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), 40 TON, M870A3

TECHNICAL MANUAL; OPERATOR AND FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

JUNE 2014
TM-5-2330-325-13-P

  TM-5-2330-325-13-P - Page 69 of 648

LOAD DISTRIBUTION - Continued
Capabilities
The following information is provided for the purpose of calculating weight distribution and to ensure that the
semitrailer and towing vehicle are not overloaded.
•
The semitrailer is rated to carry 80,000 lb (40 ton, 36,320 kg). The rear axle group is capable of
supporting a maximum weight of 103,320 lb (52 ton, 46,907.3 kg) total (semitrailer weight and payload).
•
The M916 towing vehicle is capable of supporting a maximum weight of 40,000 lbs (20 ton, 18,160 kg)
total at the kingpin.
END OF TASK
CALCULATING CG
1.
Generally, military vehicles and equipment have data plates that provide embarkation or loading information
including the location of the CG. When the CG of the payload is known, the portion of the load is known, the
portion of the load that is bearing on the kingpin and the portion that is bearing on the axles can
be determined.
2.
To determine if the semitrailer and towing vehicle combination is within its load bearing capability, this data
should be compared to the semitrailer and towing vehicle limitations listed in the appropriate manuals and
found on the embarkation/load data plates.
3.
Use the data and formulas provided in (Figure 1) to determine if the semitrailer is loaded properly and within
its limits. Known information for the semitrailer is provided. Information for the payload will need to be
calculated through measurements and from data contained on the payload, vehicle, or equipment.
CG = Center of Gravity
M870A3 Data
CL = Center Line
WB = 448.06 in. (37 ft 4-1/16 in.)
EWF = 7,840 lb (3,556 kg)
EWR = 15,320 lb (6,940.0 kg)
EWF = Trailer Empty Weight at Front
EWR = Trailer Empty Weight at Rear
WB = Wheelbase
(Y) x Payload Weight
+ EWR = Axle Load
WB
(X) x Payload Weight
+ EWF = Kingpin Load
WB
Y
X
CL OF
KINGPIN
CL OF TANDEM
PAYLOAD CG
466-0009
Figure 1.
Calculating Semitrailer CG with Payload.
END OF TASK
TM 5-2330-325-13&P
0005
0005-3


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