Latest MACK DMM Recallshttp://www.arfc.org/rss/feeds/autos/mack/dmmThe latest automotive recalls from the National Highway Transportation Safety AdministrationSun, 05 May 2024 10:03:51 GMTen-us1440Copyright 2024, Eladrel Technologies, LLCAutomotive2003 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, SUPPLY, CHECK VALVECERTAIN HEAVY DUTY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS." IMPROPER SEATING OF THE CHECK VALVE RETAINER IN THE BRASS FITTING HOUSING HAS OCCURRED. IT IS POSSIBLE FOR THE AIR BRAKE SYSTEM PRESSURE TO PUSH THE CHECK VALVE INTERNAL PARTS INTO THE PRIMARY SYSTEM RESERVOIR AND A VEHICLE OPERATOR WOULD NOT KNOW THAT THIS HAS HAPPENED. http://www.arfc.org/commercial/mack/dmm/recalls/000020500000111358000000094/recall.aspxThu, 17 Jul 2003 00:00:00 GMT2001 MACK DMM RECALLED FOR STEERING, HYDRAULIC POWER ASSIST, PUMPVEHICLE DESCRIPTION: TRUCKS EQUIPPED WITH E-TECH ENGINES. A CONDITION EXISTS ON THE AUXILIARY DRIVE SHAFT OF THE E-TECH ENGINE THAT CAUSES THE LOSS OF POWER STEERING ON VEHICLES WHERE THE POWER STEERING PUMP IS MOUNTED OFF THE FRONT OF THE ENGINE.http://www.arfc.org/commercial/mack/dmm/recalls/000014659000101121000000012/recall.aspxFri, 21 Dec 2001 00:00:00 GMT2001 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, CONTROLSVEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH CERTAIN MERITOR-WABCO BRAKE SYSTEM TWO AND FOUR PORT RELAY VALVES. THE VALVE MAY STICK OPEN WHEN A HIGH-PRESSURE APPLICATION IS RELEASED.http://www.arfc.org/commercial/mack/dmm/recalls/000013942000101121000000088/recall.aspxWed, 01 Aug 2001 00:00:00 GMT2000 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, CONTROLSVEHICLE DESCRIPTION: HEAVY DUTY TRUCKS EQUIPPED WITH CERTAIN MERITOR-WABCO BRAKE SYSTEM TWO AND FOUR PORT RELAY VALVES. THE VALVE MAY STICK OPEN WHEN A HIGH-PRESSURE APPLICATION IS RELEASED.http://www.arfc.org/commercial/mack/dmm/recalls/000013942000101120000000088/recall.aspxWed, 01 Aug 2001 00:00:00 GMT1992 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015510000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1991 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015498000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1990 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015508000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1989 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015507000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1988 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015495000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1987 MACK DMM RECALLED FOR VEHICLE SPEED CONTROLFUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.http://www.arfc.org/commercial/mack/dmm/recalls/000006998000015505000000294/recall.aspxTue, 15 Feb 1994 00:00:00 GMT1989 MACK DMM RECALLED FOR VISIBILITY, WINDSHIELD WIPER/WASHER, LINKAGESA TOLERANCE MISMATCH IN THE CRANK ASSEMBLY OF THE BOSCH WINDSHIELD WIPER MOTOR COULD CAUSE INSTANTANEOUS SEPARATION OF THE CRANK FROM THE LINKAGE ASSEMBLY IN THE LEFT HAND CONTROL ARM ASSEMBLY; THIS WOULD MAKE THE SYSTEM INOPERABLE.http://www.arfc.org/commercial/mack/dmm/recalls/000005857000015507000000246/recall.aspxFri, 16 Mar 1990 00:00:00 GMT1988 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000015495000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1987 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000015505000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1986 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057220000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1985 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057224000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1984 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057217000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1983 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057216000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1982 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057221000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1981 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057215000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1980 MACK DMM RECALLED FOR STEERING, LINKAGESCRACK MAY DEVELOP ON STEERING ARM THAT COULD PROGRESS AND REDUCE THE FATIGUE LIFE OF THE STEERING ARM.http://www.arfc.org/commercial/mack/dmm/recalls/000005840000057222000000015/recall.aspxFri, 23 Feb 1990 00:00:00 GMT1979 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, ENGINEIN THE EVENT OF TURBOCHARGER COMPRESSOR WHEEL FAILURE, ONE OR MORE OF THE FOUR CAPSCREWS THAT HOLD THE TURBOCHARGER TOGETHER MAY BE STRUCK BY PARTS OF THE COMPRESSOR WHEEL, RESULTING IN THE CAPSCREWS BEING DAMAGED. IF THESE CAPSCREWS ARE DAMAGED TO THE POINT THAT THEY ALLOW THE COMPRESSOR BACK PLATE TO DISLOCATE FROM THE TURBOCHARGER BEARING HOUSING, ENGINE LUBRICATING OIL MAY BE ALLOWED TO ESCAPE UNDER PRESSURE, CONTACTING THE ENGINE EXHAUST MANIFOLD SECTIONS OR TURBOCHARGER TURBINE HOUSING.http://www.arfc.org/commercial/mack/dmm/recalls/000003221000053125000000128/recall.aspxThu, 31 May 1979 00:00:00 GMT1978 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, ENGINEIN THE EVENT OF TURBOCHARGER COMPRESSOR WHEEL FAILURE, ONE OR MORE OF THE FOUR CAPSCREWS THAT HOLD THE TURBOCHARGER TOGETHER MAY BE STRUCK BY PARTS OF THE COMPRESSOR WHEEL, RESULTING IN THE CAPSCREWS BEING DAMAGED. IF THESE CAPSCREWS ARE DAMAGED TO THE POINT THAT THEY ALLOW THE COMPRESSOR BACK PLATE TO DISLOCATE FROM THE TURBOCHARGER BEARING HOUSING, ENGINE LUBRICATING OIL MAY BE ALLOWED TO ESCAPE UNDER PRESSURE, CONTACTING THE ENGINE EXHAUST MANIFOLD SECTIONS OR TURBOCHARGER TURBINE HOUSING.http://www.arfc.org/commercial/mack/dmm/recalls/000003221000052605000000128/recall.aspxThu, 31 May 1979 00:00:00 GMT1977 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, ENGINEIN THE EVENT OF TURBOCHARGER COMPRESSOR WHEEL FAILURE, ONE OR MORE OF THE FOUR CAPSCREWS THAT HOLD THE TURBOCHARGER TOGETHER MAY BE STRUCK BY PARTS OF THE COMPRESSOR WHEEL, RESULTING IN THE CAPSCREWS BEING DAMAGED. IF THESE CAPSCREWS ARE DAMAGED TO THE POINT THAT THEY ALLOW THE COMPRESSOR BACK PLATE TO DISLOCATE FROM THE TURBOCHARGER BEARING HOUSING, ENGINE LUBRICATING OIL MAY BE ALLOWED TO ESCAPE UNDER PRESSURE, CONTACTING THE ENGINE EXHAUST MANIFOLD SECTIONS OR TURBOCHARGER TURBINE HOUSING.http://www.arfc.org/commercial/mack/dmm/recalls/000003221000051831000000128/recall.aspxThu, 31 May 1979 00:00:00 GMT1978 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, ANTILOCK, INTERCONNECTING ASSEMBLY(WIRING)DELAYS OF UP TO ABOUT 2 SECONDS MAY EXIST IN THE BRAKE APPLICATION TIMES TO THE BRAKES ON THE BOGIE AXLES IN THE PRESENCE OF CERTAIN TYPES OF WHEEL SPEED SENSOR SIGNAL DISCONTINUITIES OR DISTORTIONS THAT MAY OCCUR AS A RESULT OF SENSOR WIRE FAILURE. THIS CONSTITUTES A NON-COMPLIANCE TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS".http://www.arfc.org/commercial/mack/dmm/recalls/000002955000052605000000112/recall.aspxTue, 03 Oct 1978 00:00:00 GMT1977 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, ANTILOCK, INTERCONNECTING ASSEMBLY(WIRING)DELAYS OF UP TO ABOUT 2 SECONDS MAY EXIST IN THE BRAKE APPLICATION TIMES TO THE BRAKES ON THE BOGIE AXLES IN THE PRESENCE OF CERTAIN TYPES OF WHEEL SPEED SENSOR SIGNAL DISCONTINUITIES OR DISTORTIONS THAT MAY OCCUR AS A RESULT OF SENSOR WIRE FAILURE. THIS CONSTITUTES A NON-COMPLIANCE TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS".http://www.arfc.org/commercial/mack/dmm/recalls/000002955000051831000000112/recall.aspxTue, 03 Oct 1978 00:00:00 GMT1978 MACK DMM RECALLED FOR STEERING, LINKAGES, KNUCKLE, SPINDLE, ARMTHE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.http://www.arfc.org/commercial/mack/dmm/recalls/000002917000052605000000021/recall.aspxTue, 08 Aug 1978 00:00:00 GMT1977 MACK DMM RECALLED FOR STEERING, LINKAGES, KNUCKLE, SPINDLE, ARMTHE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.http://www.arfc.org/commercial/mack/dmm/recalls/000002917000051831000000021/recall.aspxTue, 08 Aug 1978 00:00:00 GMT1976 MACK DMM RECALLED FOR STEERING, LINKAGES, KNUCKLE, SPINDLE, ARMTHE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.http://www.arfc.org/commercial/mack/dmm/recalls/000002917000051128000000021/recall.aspxTue, 08 Aug 1978 00:00:00 GMT1975 MACK DMM RECALLED FOR STEERING, LINKAGES, KNUCKLE, SPINDLE, ARMTHE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.http://www.arfc.org/commercial/mack/dmm/recalls/000002917000050654000000021/recall.aspxTue, 08 Aug 1978 00:00:00 GMT1974 MACK DMM RECALLED FOR STEERING, LINKAGES, KNUCKLE, SPINDLE, ARMTHE EXISTING CROSS STEERING ARMS MAY HAVE INSUFFICIENT FATIGUE LIFE IN THE NECK AREA. THIS IS NEAR THE BOSS FOR THE CROSS STEERING TUBE BALL JOINT CONNECTION. FAILURE OF EITHER OF THE CROSS STEERING LEVERS COULD LEAD TO LOSS OF STEERING CONTROL OF THE RIGHT FRONT WHEEL.http://www.arfc.org/commercial/mack/dmm/recalls/000002917000050655000000021/recall.aspxTue, 08 Aug 1978 00:00:00 GMT1976 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, ANTILOCK, CONTROL UNIT/MODULEAN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.http://www.arfc.org/commercial/mack/dmm/recalls/000002813000051128000000111/recall.aspxTue, 04 Apr 1978 00:00:00 GMT1975 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, ANTILOCK, CONTROL UNIT/MODULEAN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.http://www.arfc.org/commercial/mack/dmm/recalls/000002813000050654000000111/recall.aspxTue, 04 Apr 1978 00:00:00 GMT1974 MACK DMM RECALLED FOR SERVICE BRAKES, AIR, ANTILOCK, CONTROL UNIT/MODULEAN AXLE "NO BRAKE" CONDITION COULD RESULT FROM AN EATON CONTROLLER INTERNAL ELECTRICAL MALFUNCTION. THIS CONDITION MAY CAUSE THE ANTI-WHEEL LOCK VALVE SOLENOID TO BE CONTINUOUSLY ENERGIZED AND PREVENT THE BRAKES FROM BEING APPLIED ON ONE OF THE AXLES. AS A RESULT, THE ANTI-WHEEL LOCK WARNING LAMP IS NOT ACTIVATED.http://www.arfc.org/commercial/mack/dmm/recalls/000002813000050655000000111/recall.aspxTue, 04 Apr 1978 00:00:00 GMT1977 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000051831000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1977 MACK DMM RECALLED FOR SEAT BELTS, FRONT, ANCHORAGETHE INVOLVED VEHICLES DO NOT CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 209, "SEATBELT ASSEMBLIES". ALTHOUGH THE SEATBELTS IN QUESTION PERFORMED MARGINALLY WITH RESPECT TO THE 5000 LB. LOAD REQUIREMENT, ADDITIONAL TESTING CONFIRMED THAT THE ANCHOR COULD FAIL, ALLOWING EITHER THE ANCHOR TO SLIP OVER THE HOLD-DOWN NUT OR THE ANCHOR TO SEPARATE INTO TWO PIECES.http://www.arfc.org/commercial/mack/dmm/recalls/000002611000051831000000265/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1976 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000051128000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1975 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000050654000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1974 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000050655000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1973 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000051830000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT1972 MACK DMM RECALLED FOR ENGINE AND ENGINE COOLING, COOLING SYSTEM, FANTHE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.http://www.arfc.org/commercial/mack/dmm/recalls/000002610000051833000000136/recall.aspxWed, 12 Oct 1977 00:00:00 GMT