451:
463:
475:
31:
439:
1595:
373:
1604:
426:
towing the 155‑mm gun and 8‑in. howitzer. The chassis was designated M121. It had a 14 ft (4.27 m) steel cargo body with folding troop seats, bows and canvas cover. A single front-mounted
Garwood DSA716 45,000 lb (20,000 kg) capacity winch was fitted, and a chain hoist at rear for
358:
A standardized REO designed cab, also used in the 2 1/2 and 5‑ton trucks, was used. It had hinged doors with roll-up windows, a folding windshield, and a removable canvas roof. A hard roof could be fitted. With the same cabs and similarly designed fenders and hoods, the main visual difference between
354:
The M15A2 was the trailer that the M123 was intended to tow. It had a higher load plate and larger coupling pin than a standard semi-trailer. Early M123 had a larger fifth wheel mounted above the frame rails, but as more standard trailers were used, the M123C and all following models had lowered
316:
on the outer ends and allowed a tighter turning radius. The two rear axles were a double reduction type. Final drive ratios were 9.02:1 for gas powered trucks and 10.11:1 for diesels. The driveline for every M123 and M125 was built by Mack, regardless of who manufactured the rest of the truck.
380:
The M123 was used to tow semi-trailers carrying MBT's (in conjunction with the M15A1 and later the M747 semi-trailers) superseding the M26(A1) Pacific "Dragon Wagon" and the semi-trailers carrying engineering equipment (in conjunction with the M127 low bed semi-trailers).
308:
with the transfer case mounted solidly to the rear of the transmission. This transmission was direct in 5th. The transfer case had a 2.50:1 low range, engaged the front axle, and had a power take-off to operate the winch(es).
238:-ton, 6x6 truck), was chosen. Designed as an entire family of trucks, only the semi-tractor and cargo/prime mover were built. 392 M123 were built between 1955 and 1957 and 552 M125 were built between 1957 and 1958.
300:
developing 300 hp (220 kW) at 3000 rpm and 580 lbf⋅ft (786 N⋅m) torque at 2100 rpm. This engine was also retrofitted into M123 to make M123E2. No M125 were converted to diesel power.
344:
were used. The M123 was able to control the trailer brakes independently of the tractor. The M125 had electrical connections for the artillery piece brakes. In both models, the tire size was 14.00x24.
496:
194:
337:, the rear tandem beam axles were mounted on a leaf sprung "walking beam" type suspension. All models shared a 181 inches (4.60 m) wheelbase (measured from the 1st to the 3rd axles).
1140:
1644:
1607:
1598:
491:
1629:
241:
In 1965 CONDEC began building 3188 diesel powered M123A, Mack began building 420 in 1968. In 1969 Mack then upgraded 210 gas engine models to diesel power.
1189:
1306:
1133:
1367:
1393:
973:
250:
In addition to the US Army, the M123 was used by the U.S. Marine Corps and exported to U.S. allies in such countries as
Australia and Spain.
208:
was a heavy cargo truck version of the M123. The M123 was used to tow tank transporter trailers while the M125 towed field artillery pieces.
931:
216:
In 1949 the US Army set a requirement for a family of extra heavy-duty 10‑ton (9,072 kg) load rated, off-road, 6x6 tactical trucks.
1410:
1362:
1126:
704:
1342:
1204:
1526:
1244:
745:
714:
693:
244:
With the Army using more self‑propelled artillery, the need for prime movers was reduced, no follow‑up orders for M125 were made.
1398:
1286:
1271:
1261:
1256:
506:
1337:
1332:
1639:
1634:
1357:
450:
351:. Different M123 models had either one or two winches mounted behind the cab, all M125 had a single winch at the front.
1466:
1092:
462:
791:
293:
966:
347:
The main differences between various chassis was the location of the 45,000 lb (20,000 kg) winches and
1405:
861:
338:
305:
1087:
355:
fifth wheels. The pin remained larger, so any trailer towed by any M123 had to have an interchangeable pin.
809:
TM 9-2320-206-20 Organizational Maint. Manual for Truck, Tractor, 10-ton, 6X6, M123, and Truck, Cargo, M125
1415:
1352:
1291:
1281:
1118:
281:
247:
Both M123 and M125 saw service in the
Vietnam War. M123 tractors remained in Army service into the 1990s.
755:
1471:
267:
1082:
1150:
1052:
959:
501:
348:
1047:
1569:
1476:
1062:
264:
1541:
438:
897:
757:
TM 9-2320-206-10 Operator's manual for Truck, Tractor, 10-ton, 6X6, M123, and Truck, Cargo, M125
474:
792:"TM 9-2320-206-12 Oper. Maint. Manual Truck, Tractor 10-ton, 6X6, M123, and Truck, Cargo, M125"
1077:
927:
741:
710:
689:
720:
1577:
1425:
1296:
1184:
1102:
1486:
773:
313:
198:
843:
825:
807:
359:
these three models was the size of the vehicle and the scale of the cab to the vehicle.
926:
Jane's
Military Vehicles and Ground Support Equipment 1984, pages 486 and 465 (M125),
1623:
1443:
1301:
1097:
1057:
1042:
1021:
1016:
403:
M123A1C, built from 1965 to 1969 by CONDEC, had a diesel engine and single rear winch
326:
297:
273:
1510:
1461:
1453:
1438:
1199:
1001:
945:
941:
937:
423:
400:
M123A1 had a single rear winch and a V‑8 diesel engine (300 hp (224 kW)).
201:
30:
881:
TM 9-2815-213-34 DS and GS Maint. Manual for Engine, Diesel, Cummins Model V8-300
845:
TM 9-2320-206-34P DS. & GS. Maint. Parts & Tools Truck, 10-ton, 6x6, M123
1582:
1072:
996:
982:
511:
372:
334:
304:
The drivetrain was a repeat of that in the Mack NO, with a Mack TRDXT72 5 speed
217:
1531:
1505:
1495:
1194:
1107:
394:
M123C had a single mid-ship winch and low mounted fifth wheel, gasoline engine
341:
277:
920:
TM 9-8003-1 (25 June 1956) Ordnance Maint. for Engine, Accessories and Clutch
1500:
1383:
1276:
1266:
397:
M123D had dual mid-ship winches and low mounted fifth wheel, gasoline engine
330:
270:
827:
TM 9-2320-206-20P Org. Maint. Parts & Tools Truck, 10-ton, 6x6, M123
1559:
1554:
1037:
1011:
1006:
879:
419:
312:
The front axle was an unusual triple reduction type which did not need
289:
221:
1549:
1239:
285:
923:
TM 9-2320-206-ESC (ESC stands for
Equipment Serviceability Criteria)
391:
M123 had dual winches and high mounted fifth wheel, gasoline engine
1249:
371:
263:
All M123 and M125 built in the 1950s had a LeRoi T‑H844 engine, a
1347:
914:
ORD 7 SNL G-792 (31 January 1958) Section I, LeRoi engine parts.
1122:
955:
592:
590:
588:
586:
573:
571:
569:
567:
565:
563:
951:
663:
661:
636:
634:
609:
607:
605:
535:
533:
531:
529:
527:
406:
M123E1 were M123's that were upgraded with the diesel engine.
550:
548:
179:
866:. US Depts. of the Army. February 1953. pp. 101, 102
899:
TM 10-1679 Maint Manual for Mack Models NO 2, 3, & 6
775:
TM 9-2320-206-10HR Hand
Receipt Truck, 10-ton, 6x6, M123
422:
as a heavy cargo transport vehicle; it also served as a
288:
at 1700 rpm. The M123A1 built in the 1960s had a
738:
A Record of
Military Macks in the Services and Beyond
1568:
1540:
1519:
1485:
1452:
1424:
1376:
1315:
1213:
1158:
1030:
989:
178:
166:
158:
150:
138:
125:
117:
109:
101:
96:
85:
77:
69:
61:
56:
48:
40:
21:
1608:List of soft-skinned vehicles of the US military
946:http://olive-drab.com/idphoto/id_photos_m125.php
667:
640:
625:
613:
539:
492:List of U.S. military vehicles by model number
1134:
967:
688:(3 ed.). Victory WW2. pp. 380–382.
8:
409:M123E2 with dual rear winches, diesel engine
292:V8‑300, a 785 cu in (12.9 L)
1603:
1141:
1127:
1119:
974:
960:
952:
706:Standard Catalog of U.S. Military Vehicles
652:
596:
18:
1645:Military vehicles introduced in the 1950s
709:(2 ed.). Krause. pp. 223–229.
113:23 feet 4 inches (7.11 m)
554:
523:
434:
129:9 feet 3 inches (2.82 m)
121:9 feet 6 inches (2.90 m)
1599:Military vehicles of the United States
740:. After the Battle. pp. 114–116.
284:and 725 lbf⋅ft (983 N⋅m) of
794:. US Dept. Of the Army. February 1960
577:
220:design, influenced by their WWII era
105:32,490 lb (14,740 kg) empty
7:
1630:Military trucks of the United States
1343:Family of Medium Tactical Vehicles
14:
1527:Ranger Special Operations Vehicle
329:chassis type was used. The front
265:844 cu in (13.8 L)
1602:
1594:
1593:
507:Mack NM Truck, 6-Ton, 6x6, Cargo
497:List of supply catalog G-numbers
473:
461:
449:
437:
29:
23:M123 and M125 10-ton 6x6 truck
1462:AM General / Freightliner M915
86:
1:
1190:Willys M274 "Mechanical Mule"
884:. US Dept. Of the Army. 1972
848:. US Dept. of the Army. 1972
830:. US Dept. Of the Army. 1977
812:. US Dept. Of the Army. 1971
778:. US Dept. Of the Army. 1978
760:. US Dept. Of the Army. 1977
686:US Military Wheeled Vehicles
917:TM 9-8002 (1 November 1955)
863:TM 9-2800 Military Vehicles
174:300 mi (482.8 km)
1661:
184:42 mph (68 km/h)
162:Beam axles on leaf springs
1591:
1353:General Dynamics Flyer 72
1282:General Dynamics Flyer 60
736:Vanderveen, Bart (1998).
456:M15A2 (top) M172 (bottom)
278:297 hp (221 kW)
146:297 hp (221 kW)
133:
49:Place of origin
28:
684:Crismon, Fred W (2001).
580:, pp. 283–288, 290.
468:M123 towing M747 trailer
204:introduced in 1955. The
1489:tractors & carriers
1477:I.H. M39 / M52 and M246
1384:Caterpillar M520 "Goer"
1245:Ground Mobility Vehicle
668:TM 9-2320-206-12 (1960)
641:TM 9-2320-206-20 (1971)
626:TM 9-2815-213-34 (1972)
614:TM 9-2320-206-34 (1972)
540:TM 9-2320-206-10 (1977)
418:The M125 succeeded the
1467:AM General M931 / M932
377:
1496:M8 high-speed tractor
1153:introduced after 1945
1151:soft-skinned vehicles
703:Doyle, David (2003).
427:handling ammunition.
375:
97:Specifications (M123)
1640:Six-wheeled vehicles
1635:Mack Trucks vehicles
1570:All-terrain vehicles
259:Engine and driveline
144:(for other see text)
1542:Amphibious vehicles
1520:Specialist vehicles
902:. US War Dept. 1943
599:, pp. 82, 115.
557:, pp. 380–382.
294:naturally aspirated
1578:John Deere M-Gator
723:on 15 January 2018
378:
57:Production history
1614:
1613:
1583:Polaris MRZR-(D)2
1426:Tank transporters
1377:8–16.5 ton trucks
1358:International M39
1257:Chevrolet CUCV II
1200:Willys MD / M38A1
1116:
1115:
653:TM 10-1679 (1943)
597:Vanderveen (1998)
376:1963 Mack M123A1C
188:
187:
154:5 speed x 2 range
44:10-ton 6x6 trucks
35:M123 Semi-tractor
16:10-ton 6x6 trucks
1652:
1606:
1605:
1597:
1596:
1325:
1324:
1320:
1297:Kaiser Jeep M715
1272:Dodge M880s CUCV
1240:AM General HMMWV
1232:
1231:
1227:
1222:
1221:
1217:
1185:M422 Mighty Mite
1177:
1176:
1172:
1167:
1166:
1162:
1143:
1136:
1129:
1120:
1068:M123/M125 series
976:
969:
962:
953:
911:
909:
907:
893:
891:
889:
875:
873:
871:
857:
855:
853:
839:
837:
835:
821:
819:
817:
803:
801:
799:
787:
785:
783:
769:
767:
765:
751:
732:
730:
728:
719:. Archived from
699:
671:
665:
656:
650:
644:
638:
629:
623:
617:
611:
600:
594:
581:
575:
558:
552:
543:
537:
477:
465:
453:
441:
314:universal joints
237:
236:
232:
229:
181:
92:3580 (+552 M125)
88:
33:
24:
19:
1660:
1659:
1655:
1654:
1653:
1651:
1650:
1649:
1620:
1619:
1617:
1615:
1610:
1601:
1587:
1564:
1536:
1515:
1481:
1448:
1420:
1399:M1120 HEMTT LHS
1372:
1338:AM General M939
1333:AM General M809
1322:
1318:
1317:
1311:
1229:
1225:
1224:
1219:
1215:
1214:
1209:
1195:Willys MC / M38
1174:
1170:
1169:
1164:
1160:
1159:
1154:
1147:
1117:
1112:
1026:
985:
980:
944:on Olive Drab (
905:
903:
896:
887:
885:
878:
869:
867:
860:
851:
849:
842:
833:
831:
824:
815:
813:
806:
797:
795:
790:
781:
779:
772:
763:
761:
754:
748:
735:
726:
724:
717:
702:
696:
683:
680:
675:
674:
666:
659:
651:
647:
639:
632:
624:
620:
612:
603:
595:
584:
576:
561:
553:
546:
538:
525:
520:
488:
481:
478:
469:
466:
457:
454:
445:
442:
433:
416:
370:
365:
333:was mounted on
323:
274:gasoline engine
261:
256:
234:
230:
227:
225:
214:
171:
169:
145:
143:
134:
36:
22:
17:
12:
11:
5:
1658:
1656:
1648:
1647:
1642:
1637:
1632:
1622:
1621:
1612:
1611:
1592:
1589:
1588:
1586:
1585:
1580:
1574:
1572:
1566:
1565:
1563:
1562:
1560:LARC-LX "BARC"
1557:
1552:
1546:
1544:
1538:
1537:
1535:
1534:
1529:
1523:
1521:
1517:
1516:
1514:
1513:
1508:
1503:
1498:
1492:
1490:
1483:
1482:
1480:
1479:
1474:
1469:
1464:
1458:
1456:
1454:Tractor trucks
1450:
1449:
1447:
1446:
1441:
1436:
1430:
1428:
1422:
1421:
1419:
1418:
1413:
1408:
1403:
1402:
1401:
1391:
1386:
1380:
1378:
1374:
1373:
1371:
1370:
1365:
1360:
1355:
1350:
1345:
1340:
1335:
1329:
1327:
1313:
1312:
1310:
1309:
1307:HDT Storm SRTV
1304:
1299:
1294:
1292:GM Defence ISV
1289:
1284:
1279:
1274:
1269:
1264:
1262:Chevrolet LSSV
1259:
1254:
1253:
1252:
1247:
1236:
1234:
1211:
1210:
1208:
1207:
1202:
1197:
1192:
1187:
1181:
1179:
1156:
1155:
1148:
1146:
1145:
1138:
1131:
1123:
1114:
1113:
1111:
1110:
1105:
1100:
1095:
1090:
1085:
1080:
1075:
1070:
1065:
1060:
1055:
1050:
1045:
1040:
1034:
1032:
1028:
1027:
1025:
1024:
1019:
1014:
1009:
1004:
999:
993:
991:
987:
986:
981:
979:
978:
971:
964:
956:
950:
949:
934:
924:
921:
918:
915:
912:
894:
876:
858:
840:
822:
804:
788:
770:
752:
746:
733:
715:
700:
694:
679:
676:
673:
672:
657:
645:
630:
618:
601:
582:
559:
555:Crismon (2001)
544:
522:
521:
519:
516:
515:
514:
509:
504:
499:
494:
487:
484:
483:
482:
479:
472:
470:
467:
460:
458:
455:
448:
446:
443:
436:
432:
429:
415:
412:
411:
410:
407:
404:
401:
398:
395:
392:
369:
366:
364:
361:
322:
319:
268:overhead valve
260:
257:
255:
254:Specifications
252:
213:
210:
186:
185:
182:
180:Maximum speed
176:
175:
172:
167:
164:
163:
160:
156:
155:
152:
148:
147:
140:
136:
135:
131:
130:
127:
123:
122:
119:
115:
114:
111:
107:
106:
103:
99:
98:
94:
93:
90:
83:
82:
79:
75:
74:
71:
67:
66:
63:
59:
58:
54:
53:
50:
46:
45:
42:
38:
37:
34:
26:
25:
15:
13:
10:
9:
6:
4:
3:
2:
1657:
1646:
1643:
1641:
1638:
1636:
1633:
1631:
1628:
1627:
1625:
1618:
1609:
1600:
1590:
1584:
1581:
1579:
1576:
1575:
1573:
1571:
1567:
1561:
1558:
1556:
1553:
1551:
1548:
1547:
1545:
1543:
1539:
1533:
1530:
1528:
1525:
1524:
1522:
1518:
1512:
1509:
1507:
1504:
1502:
1499:
1497:
1494:
1493:
1491:
1488:
1484:
1478:
1475:
1473:
1470:
1468:
1465:
1463:
1460:
1459:
1457:
1455:
1451:
1445:
1444:Oshkosh M1070
1442:
1440:
1437:
1435:
1432:
1431:
1429:
1427:
1423:
1417:
1414:
1412:
1409:
1407:
1404:
1400:
1397:
1396:
1395:
1394:Oshkosh HEMTT
1392:
1390:
1387:
1385:
1382:
1381:
1379:
1375:
1369:
1366:
1364:
1361:
1359:
1356:
1354:
1351:
1349:
1346:
1344:
1341:
1339:
1336:
1334:
1331:
1330:
1328:
1326:–7 ton trucks
1314:
1308:
1305:
1303:
1302:M1161 Growler
1300:
1298:
1295:
1293:
1290:
1288:
1287:GM M1009 CUCV
1285:
1283:
1280:
1278:
1275:
1273:
1270:
1268:
1265:
1263:
1260:
1258:
1255:
1251:
1248:
1246:
1243:
1242:
1241:
1238:
1237:
1235:
1212:
1206:
1203:
1201:
1198:
1196:
1193:
1191:
1188:
1186:
1183:
1182:
1180:
1157:
1152:
1144:
1139:
1137:
1132:
1130:
1125:
1124:
1121:
1109:
1106:
1104:
1101:
1099:
1096:
1094:
1091:
1089:
1086:
1084:
1081:
1079:
1076:
1074:
1071:
1069:
1066:
1064:
1061:
1059:
1056:
1054:
1051:
1049:
1046:
1044:
1041:
1039:
1036:
1035:
1033:
1029:
1023:
1020:
1018:
1015:
1013:
1010:
1008:
1005:
1003:
1000:
998:
995:
994:
992:
990:In production
988:
984:
977:
972:
970:
965:
963:
958:
957:
954:
947:
943:
939:
935:
933:
932:0 7106 0794 6
929:
925:
922:
919:
916:
913:
901:
900:
895:
883:
882:
877:
865:
864:
859:
847:
846:
841:
829:
828:
823:
811:
810:
805:
793:
789:
777:
776:
771:
759:
758:
753:
749:
747:1-870067-09-6
743:
739:
734:
722:
718:
716:0-87349-508-X
712:
708:
707:
701:
697:
695:0-970056-71-0
691:
687:
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52:United States
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1472:CCC M920 MET
1439:Oshkosh M911
1433:
1411:Oshkosh LVSR
1388:
1363:Oshkosh MTVR
1233:ton vehicles
1178:ton vehicles
1149:US military
1078:MC/MR series
1067:
1031:Discontinued
936:Articles on
904:. Retrieved
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886:. Retrieved
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868:. Retrieved
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780:. Retrieved
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725:. Retrieved
721:the original
705:
685:
648:
621:
578:Doyle (2003)
417:
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349:fifth-wheels
346:
335:leaf springs
327:ladder frame
324:
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306:transmission
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215:
205:
202:semi-tractor
191:
189:
151:Transmission
73:Mack, CONDEC
70:Manufacturer
1416:Oshkosh PLS
1406:Oshkosh LVS
1205:M151 "MUTT"
1103:Super-Liner
1083:Metro-Liner
983:Mack Trucks
888:3 September
512:Mack Trucks
424:prime mover
342:drum brakes
276:developing
168:Operational
89: built
1624:Categories
1532:Unimog 419
1506:M116 Husky
678:References
159:Suspension
1511:M973 SUSV
1501:M76 Otter
1434:Mack M123
1389:Mack M125
1348:Ford M656
1277:Gama Goat
1267:Dodge M43
1093:NO Series
1088:NM Series
1053:EH series
1048:CH series
1038:AC series
906:16 August
816:16 August
764:30 August
331:beam axle
206:Mack M125
192:Mack M123
81:1955–1969
1098:R series
1063:L series
1058:F series
1043:B series
1022:TerraPro
1017:Pinnacle
870:9 August
852:9 August
834:9 August
798:9 August
782:9 August
727:26 April
486:See also
385:Variants
339:Full air
78:Produced
62:Designer
1555:LARC-XV
1487:Tracked
1368:REO M35
1321:⁄
1228:⁄
1218:⁄
1173:⁄
1163:⁄
1002:Granite
502:Mack EH
431:Gallery
420:Mack NO
321:Chassis
290:Cummins
233:⁄
212:History
1550:LARC-V
1073:Magnum
997:Anthem
930:
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713:
692:
444:M123E2
363:Models
286:torque
218:Mack's
195:(G792)
139:Engine
126:Height
110:Length
1250:M1151
1108:Titan
518:Notes
170:range
118:Width
942:M125
940:and
938:M123
928:ISBN
908:2015
890:2015
872:2015
854:2015
836:2015
818:2015
800:2015
784:2015
766:2015
742:ISBN
729:2018
711:ISBN
690:ISBN
480:M125
414:M125
368:M123
190:The
102:Mass
65:Mack
41:Type
296:V8
282:rpm
199:6x6
87:No.
1626::
1223:–1
1012:MD
1007:LR
660:^
633:^
604:^
585:^
562:^
547:^
526:^
387::
325:A
271:V8
222:NO
1323:2
1319:1
1316:2
1230:4
1226:3
1220:4
1216:3
1175:2
1171:1
1168:–
1165:4
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