OPERATOR’S, ORGANIZATIONAL DS, AND GS …

1 TM 55-1740-200-14 DEPARTMENT OF THE ARMY TECHNICAL MANUALOPERATOR S, ORGANIZATIONAL DS, AND GS MAINTENANCE MANUALINCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTTRACTOR, WHEELED, AIRCRAFT TOWINGHEADQUARTERS, DEPARTMENT OF THE ARMYMAY 1970TM 55-1740-200-14 WARNINGPRECAUTIONARY DATAP ersonnel performing operations, procedures,and practices which are included orimplied in this technical manual shall observe the following warnings. Disregard ofthese warnings and precautionary information can cause serious injury, death, ordestruction of not operate the towing tractor while air pressure warning buzzer is sounding.

2 Thisbuzzer denotes insufficient air pressure for If operating the towing tractor in an enclosed building, ensure exhaustgases are sufficiently ventilated. The exhaust gases contain carbon monoxide which is acolorless, odorless, and poisonous TOXIC/FLAMMABLE MATERIALS. Due to the toxicity and flammability ofthe solvents and solutions used in the cleaning procedures, adequate ventilation mustbe provided. Avoid prolonged contact with solutions and chemicals. Do not usedrycleaning solvent or flammable cleaners near an open flame or in areas where veryhigh temperature When handling gasoline, always provide a metal-to-metal contact between thecontainer and tank.

3 This will prevent a spark from being generated as gasoline flowsover the metal Prior to performing maintenance on the electrical system, ensure thebattery is 55-1740-200-14 TECHNICAL MANUALHEADQUARTERSDEPARTMENT OF THE , D. C.,12 May 1970 ChapterOperator s, ORGANIZATIONAL , DS, and GS Maintenance ManualIncluding Repair Parts and Special Tools ListTRACTOR, WHEELED, AIRCRAFT TOWINGTABLE OF CONTENTSPageLIST OF ILLUSTRATIONSii12 INTRODUCTIONSECTION I GENERAL ..l lSECTION II DESCRIPTION ANDLEADING Description .. Description.. Particulars.. 1-10 SECTION III TEST EQUIPMENT,SPECIAL TOOLS, ANDMATERIALS1 Equipment.

4 Tools.. 1-12 OPERATING .. of Operation .. Operation .. 2-7 ORGANIZATIONAL MAINTENANCE IN-STRUCTIONS SECTION I PREPARA-TION FOR INSTALLATION, STORAGEAND for Installation .. 3-13-12. Prepartion for Shipment andStorage ..3-2 SECTION II INSTALLATION (Not applicable)SECTION III INSPECTION ANDSERVICING3-19. General.. 3-3 SECTION IV PREVENTIVE .. 3-73-33. Cleaning ..3-73-46. Lubrication..3-12 ChapterPageSECTION V OPERATIONAL CHECKOUT3-50. GENERAL .. 3-12 SECTION VI REPAIR AND REPLACEMENTOF AUTHORIZED PARTS3-60. GENERAL..3-194 DIRECT SUPPORT AND GENERAL SUPPORTMAINTENANCE INSTRUCTIONS SECTIONI PREPARATION FOR MAINTENANCE,STORAGE, AND for Maintenance.

5 4-1 SECTION II CHECKOUT AND .. and AnalysisProcedures ..SECTION III REPAIR PROCEDURES4-203. General ..4-205. Removal and Disassembly..4-365. Repair Procedures..4-366. General ..4-461. Lubrication ..4-463 . Testing ..3 SECTION IV REASSEMBLY ANDALINEMENT4-465. General ..SECTION V ILLUSTRATED PARTSBREAKDOWN4-620 . General ..APPENDICESAREFERENCES ..BBASIC ISSUE ITEMS LIST .. B-1 CMAINTENANCE ALLOCATIONCHART ..C-lDREPAIR PARTS AND SPECIALTOOLS LIST ..D 1 ALPHABETICAL INDEX .. Index 1i..4-2..4-2.. 4-20.. 4-20..4-98..4-98..4-110..4-110.. 4-110..4-128..A-1TM 55-1740-200-14 LIST OF ILLUSTRATIONSN umberTitlePageNumberTitlePage1-11-21-31 -41 -52-12-22- 32-42-53-13-23-33-43-53-63-73-83-93-l03- 113-123-133-144-14-24-34-44-54-64-74-84- 94-l04-114-12 Type MB-4 Towing Tractor.

6 1-2 Tractor Component Description .. 1-5 Tractor Hydraulic Steering FlowDiagram ..1-6 Tractor Electrical SystemSchematic .. 1-7 Instruction and IdentificationPlates .. 1-9 Hydraulic Steering System .. 2-2 Hydraulic Brake System .. 2-3 Electrical System .. 2-5 Tractor Manual Controls .. 2-6 Instrument Cluster .. 2-7 Crane Lifting Method .. 3-2 Hydraulic Pump Belt Adjustment .. 3-5 Fan and Generator Belt Adjustment .. 3-5 Carburetor Adjustment .. 3-6 Tractor Lubrication Chart .. 3-9 Battery .. 3-19 Headlight .. 3-20 Spotlight .. 3-21 Floodlight .. 3-22 Taillight and Stoplight.

7 3-22 Carburetor Air Cleaner .. 3-23 Engine Oil Filter .. 3-23 Hydraulic Transmission Oil Filter .. 3-24 Crankcase Breather .. 3-24 Steering System AdjustmentSchematic .. 4-4 Towing Tractor - Exploded View .. 4-20 Upper Cab Assembly .. 4-22 Lower Cab Assembly .. 4-24 Hood Assembly .. 4-26 Door Assembly .. 4-28 Deck, Fenders, and RunningBoards .. 4-30 Steering System .. 4-32 Front Valve Drag Link .. 4-36 Relief Valve .. 4-38 Flow Control Valve Assembly .. 4-39 Rear Steer Cam and ValveAssembly .. 4-404-134-144-154-164-174-184-194-204-21 4-224-234-244-254-264-274-284-294-304-31 4-324-334-344 354-364-374-384-394-404-414-424-434-444- 454-464-474-484-494-50 Hydraulic Pump.

8 4-41 Booster Cylinder Assembly .. 4-42 Steering Gear ..4-44 Electrical System ..4-45 Distributor ..4-50 Generator ..4-52 Starter ..4-54 Windshield Wiper, Code Cl .. 4-56 Windshield Wiper, Codes C2 and D.. 4-58 Stoplight-Taillight .. 4-59 Floodlight ..4-60 Headlight ..4-61 Spotlight Assembly ..4-62 Instrument Panel ..4-63 Cab Heater ..4-64 Fuel System ..4-66 Fuel Pump Assembly ..4-68 Carburetor Assembly .. 4-70 Governor ..4-72 Radiator ..4-73 Engine Cooling Group ..4-74 Parking Brake and DifferentialLockout Levers ..4-76 Parking Brake Lining ..4-78 Oiling Group ..4-78 Engine and TransmissionAssembly.

9 4-80 Engine ..4-84 Transmission Propeller Shaft .. 4-86 Axle Propeller Shaft .. 4-87 Transfer Transmission .. 4-88 Brake System .. 4-90 Master Cylinder .. 4-92 Vacuum Booster .. 4-93 Axle Differential .. 4-94 Axle Assembly .. 4-94 Hub Assembly .. 4-96 Wheel Assembly .. 4-98 Frame Assembly .. 4-99 Correct and Incorrect ToothContact Patterns ..4- 125iiTM 55-1740-200-14 CHAPTER 1 INTRODUCTIONSECTION I GENERAL INFORMATION1 1. 2. This publication comprises operation and serviceinstructions for Type MB-4 towing tractor manufacturedby The American Coleman Company, Littleton, Colorado80120, under Model Number G-40.

10 (See figure 1-1.) Thismanual describes in detail maintenance allocated to theoperator, ORGANIZATIONAL ,direct support and generalsupport maintenance personnel by the maintenanceallocation chart. Two basic models of the MB-4 towingtractor, part numbers 690-1 B and 690-1 B 1, are includedin this manual. Designation codes of C and D are appliedto indicate any 3 . PURPOSE OF 4. The towing tractor is an all weatherdesigned to tow and push aircraft weighing up ,0001 5. FORMS AND 6. Maintenance forms, records, and reports which areto be used by maintenance personnel at all maintenancelevels are listed in and prescribed by TM 7.