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Hobart 140GT17P Operation And Maintenance Manual With Illustrated Parts List

6906 series engine-driven generator set
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OPERATION AND MAINTENANCE MANUAL

ILLUSTRATED PARTS LIST

ENGINE-DRIVEN GENERATOR SETS
Models 140GT17P, 140GT17K, and 140GT17P5
140-KVA, 400-HZ, 115/200-V AC, 3-PHASE
SPEC. No.
6906-1
6906-2
6906-3
6906-4
6906-5
6906-6
with
for
SERIES 6906
DESCRIPTION
Basic Series 6906 generator set, trailer-mounted
Basic Series 6906 generator set, truck-mounted
Basic Series 6906 generator set, mounted on
5th-wheel trailer, with T-R provisions, fuel tank,
battery, and trays for battery and cables.
Basic Series 6906 generator set, truck-mounted,
and equipped with magnetic amplifier type voltage
regulator, Part No. 281407
Basic Series 6906 generator set, mounted on 5th-wheel
trailer
Basic Series 6906 generator set, mounted on 5th-wheel
trailer, with fuel tank, cable tray, battery/cable tray,
rear fenders, and rear bumper
Hobart Brothers Company
Airport Systems Group
Ground Power Equipment
Troy, Ohio 45373
U.S.A.
OM-2029
010187
Revised 093089
Revised 031690
Revised 072790
Revised 040893

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Summary of Contents for Hobart 140GT17P

  • Page 1: Illustrated Parts List

    Revised 072790 Revised 040893 OPERATION AND MAINTENANCE MANUAL with ILLUSTRATED PARTS LIST ENGINE-DRIVEN GENERATOR SETS SERIES 6906 Models 140GT17P, 140GT17K, and 140GT17P5 140-KVA, 400-HZ, 115/200-V AC, 3-PHASE SPEC. No. DESCRIPTION 6906-1 Basic Series 6906 generator set, trailer-mounted 6906-2 Basic Series 6906 generator set, truck-mounted...
  • Page 2 This page intentionally left blank...
  • Page 3 SAFETY INSTRUCTIONS AND WARNINGS FOR ELECTRICAL POWER EQUIPMENT WARNING ELECTRIC SHOCK can KILL. Do not touch live electrical parts. ELECTRIC ARC FLASH can injure eyes, burn skin, cause equipment damage, and ignite combustible material. DO NOT use power cables to break load and prevent tools from causing short circuits. IMPROPER PHASE CONNECTION, PARALLELING, OR USE can damage this and attached equipment.
  • Page 4 a. Shut OFF all power at the disconnecting switch or line breaker before inspecting or servicing the equipment. b. Lock switch OPEN (or remove line fuses) so that power cannot be turned on accidentally. c. Disconnect power to equipment if it is out of service. d.
  • Page 5 OM-2029 LIST OF EFFECTIVE PAGES CHAPTER/ CHAPTER/ SECTION PAGE DATE SECTION PAGE DATE List of Mar 16/90 Sept 30/89 Effective Mar 16/90 Sept 30/89 Pages July 27/90 July 27/90 Introduction Sept 30/89 Sept 30/89 July 27/90 Contents Sept 30/89 July 27/90 Contents Sept 30/89 Sept 30/89...
  • Page 6 OM-2029 LIST OF EFFECTIVE PAGES (CONTINUED) CHAPTER/ CHAPTER/ SECTION PAGE DATE SECTION PAGE DATE Sept 30/89 Sept 30/89 Sept 30/89 July 27/90 Sept 30/89 Sept 30/89 Sept 30/89 Sept 30/89 July 27/90 Sept 30/89 Sept 30/89 Sept 30/89 Sept 30/89 Sept 30/89 Sept 30/89 Sept 30/89...

  • Page 7: Table Of Contents

    D. Quick Start Kit 6. Canopy 7. Engine, Generator, and Controls Assembly A. Basic Engine B. Engine Manufacturer’s Equipment C. Hobart Engine Equipment (1) Electric governor system (a) Magnetic pickup (b) Control unit (c) Actuator (2) Engine electrical system (3) Engine protective devices...

  • Page 8: Subject Chapter/Section Page

    OM-2029 SUBJECT CHAPTER/SECTION PAGE E. Control Box Assembly (1) Generator Control Box Front Panel Components (a) Generator output monitors (meters) (b) Meter and line switches (c) Indicating lights (d) Load contactor circuit breaker (e) Protective system circuit breaker (2) Generator Control Box Interior Components (Figure 7) (a) Sensing modules (b) Memory and time delay module...
  • Page 9 OM-2029 SUBJECT CHAPTER/SECTION PAGE SECTION 3. OPERATION 1.General 2. Operating the Generator Set A. Pre-start Inspection B. Normal Engine Starting Procedures C. Cold Weather Engine Starting Procedures D. Preparation for Power Delivery (Normal Automatic Voltage Control) E. Power Delivery No. 1 Output Circuit No.
  • Page 10 OM-2029 SUBJECT CHAPTER/SECTION PAGE 6. Engine Cooling System A. General B. Radiator Cap (1) General (2) Removal (3) Installation C. Warm Weather Operation D. Cold Weather Operation (1) General (2) Checking coolant solution (3) Preparing the coolant solution (4) Installing the antifreeze solution E.
  • Page 11 OM-2029 SUBJECT CHAPTER/SECTION PAGE 3.Electrical System (12-V DC) A. Lights B. Circuit Breakers C. Wiring and Connections 4. Electrical System (115-V AC) A. Monitoring Instruments B. Indicating Lights C. Protective Modules D. Wiring and Connections 5. Trailer and Truck SECTION 3. ADJUSTMENT/TEST 1.
  • Page 12 3. Arrangement 4. Explanation of Parts List A. Contents B. Parts List Form (1) FIGURE-ITEM NO. Column (2) HOBART PART NUMBER Column (3) NOMENCLATURE Column (4) REC. SPARES Column (5) “EFF” (Effectivity) Column (6) UNITS PER ASSEMBLY Column SECTION 2. MANUFACTURERS’...
  • Page 13 Figure 2 is an illustration that shows the various components of the inboard battery kit, which is identified as Hobart Part No. 281926. This illustration is accompanied by a parts list whose item numbers corre- spond with the call-out numbers on the illustration.
  • Page 14 OM-2029 Inboard Battery Kit Part No. 281926 Figure 2 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 281926 BATTERY INSTALLATION (For units having ONE battery) 281871-1 . BATTERY, 12 VOLTS 281927 . SUPPORT, BATTERY 181831 . FRAME, HOLD-DOWN, BATTERY 481209-4 .

  • Page 15: Customer Service

    OM-2029 3. Customer Service If you have any questions concerning your Hobart Ground Airport Systems Group equipment, you are in- vited to contact our service department by mail, telephone, or FAX. Write: Hobart Brothers Company Airport Systems Group 1177 Trade Road East Troy, Ohio 45373, U.S.A.
  • Page 16 OM-2029 This page intentionally left blank. Addendum June 6/90 Page 4...

  • Page 19: Chapter 1. Description/Operation

    (or distribution panel when applicable) . This regulator is adjustable for a variety of output cable sizes and lengths. A magnetic amplifier type voltage regulator (Hobart part no. 281407) is used on Specification 6906-3, Specification 6906-4, Specification 6906-5 and Specification 6906-6 generator sets.

  • Page 20: Sept

    OM-2029 1. Canopy 5. Engine fan exhaust vent 2. Lifting eye 6. Engine exhaust pipe 3. Windows 7. Radiator cap 4. Mounting frame Generator Set (without trailer) Figure 1 September 30/89 Revised Page 2...

  • Page 21: Dual Outputs

    OM-2029 Generator Set Mounted on Fifth-Wheel Trailer Figure 1A C. Dual Outputs Each generator set is equipped with two output circuits and dual controls so that power may be deliv- ered to an aircraft requiring two inputs, or to one or two aircraft with single input requirements. D.
  • Page 22 OM-2029 PHYSICAL BASIC UNIT Length overall 109.6 inches (2784 mm) Width 45.5 inches (1156 mm) Height overall 62.0 inches (1575 mm) Weight 3500 pounds (1496.8 kg) FOUR-WHEEL TRAILER-MOUNTED UNIT Length overall 119.0 inches (3023 mm) Width 80.0 inches (2032 mm) Height 79.0 inches (2007mm) Weight...

  • Page 23: Identification

    6906-4 Truck Similar to Spec 6906-2, except that it has magnetic amplifier type voltage regulator, Hobart Part No. 281407 6906-5 5th-Wheel Trailer Similar to Spec 6906-1, except for the trailer, and this unit DOES NOT have a fuel tank, battery, or a tray for battery and cables.

  • Page 24: Optional Equipment

    A. Four-Wheel Trailer (Specification 6906-1) This is a standard four wheel trailer, used on earlier Series 6906 generator set models, and identified by Hobart Part No. 408595. B. Fifth-Wheel Trailer A trailer with fifth-wheel front running gear is available, with or without batteries and fuel tank. This trailer with fifth-wheel replaces the previously used four wheel trailer, and reduces greatly the turning radius when the unit is being towed.

  • Page 25: Engine Manufacturer's Equipment

    (2) Reverse-flow, engine cooling fan to blow air outward through the radiator. C. Hobart Engine Equipment The engine is modified at Hobart Brothers by the addition of the following equipment: (1) Electric governor system An electric governor kit is installed on the engine to replace a conventional, mechanical type. The electric governor was selected for control of engine speed (and generator output frequency) be- cause it provides faster engine response to changes in load conditions.
  • Page 26 OM-2029 1. Radiator 8. Generator Control Box 15. Actuator, Governor 2. Fan Guard 9. Control Box, Governor 16. Lube Oil Pressure Switch 3. Muffler & Exhause Pipe 10. Power Module Panel 17. Lube Oil Pressure Sensor 4. Diesel Engine 11. Generator Assembly 18.
  • Page 27 OM-2029 (3) Engine protective devices (a) High coolant temperature switch A high coolant temperature switch (18, Fig. 3) is mounted at the rear of the engine to monitor the coolant temperature. If the coolant temperature reaches 210 degrees F (99 degrees C) , this normally closed switch opens and actuates the fuel valve solenoid which shuts down the engine.
  • Page 28 OM-2029 (5) Water Temperature Sender The water temperature sender (19, Fig. 3) is mounted at the top rear of the engine. This device actuates the temperature gage (5, Fig. 9) on the engine control panel. (6) Oil Pressure Sender The oil pressure sender (17, Fig. 3) is mounted at the right lower rear of the engine. This device senses oil pressure and operates the oil puressure gage (4, Fig.

  • Page 29: Generator

    OM-2029 D. Generator The 400-Hz generator is a brushless, revolving field, three-phase, alternating current type. The rotor assembly is mounted by two, permanently lubricated, sealed, ball bearings. The front bearing is sup- ported by the fan housing; the rear bearing is mounted in the exciter housing. Both of these housings are attached to the main generator stator housing.

  • Page 30: Generator Control Box Front Panel Components

    OM-2029 (1) Generator Control Box Front Panel Components (a) Generator output monitors (meters) • Refer to Figure 7. The generator output is monitored by three instruments; a frequency me- ter (10), a voltmeter (12), and an ammeter (13). The frequency meter is a resonant-reed type, and indicates frequency of generator ouput alternating current in the range of 380 to 420 Hz (cycles per second).

  • Page 31: (E) Protective System Circuit Breaker

    OM-2029 1. Control box 10. Frequency meter 2. Control panel 11. Underfrequency indicating light 3. Panel light 12. Generator voltmeter 4. Load contactor circuit breaker (2Amp) 13. Generator ammeter 5. Test-reset switch 14. Overload indicating light 6. Protective system circuit breaker 15.

  • Page 32: Generator Control Box Interior Components (Figure 7)

    OM-2029 (2) Generator Control Box Interior Components (Figure 8) Mounted on the generator contrl box interior are electrical and safety devices designed to protect the aircraft electrical system against damage which could result from overvoltage, undervoltage, overfrequency, or underfrequency. Also on this panel are devices for the protection and control of the generator output electrical system.

  • Page 33: (C) Plug-Interlock Relays

    OM-2029 (c) Plug-interlock relays Each ouput of the generator has a plug interlock relay. For either output, the function of the plug interlock relay is to cause its output load contactor to open in the event the cable plug connector becomes accidentally disconnected from the aircraft during power delivery, or if an attempt is made to deliver power when the output cable is not connected to the aircraft.

  • Page 34: (G) Auxiliary Underfrequency Relay

    OM-2029 1. Control box rear inside panel 11. Sensing/pre-amplifier assembly 2. Protective system interlock relay of voltage regulator No. 2 output 12.Control box right side panel 3. Plug interlock relay, No. 2 output 13. Control box bottom inside panel 4. Governor idle speed relay 14.
  • Page 35 Specification 6906-1 and Specification 6906-2 generator sets are equipped with a solid state voltage regulator, Hobart Part No. 489812A. Information and instructions for this regulator are contained in Hobart regulator manual OM2020, found in Chapter 6 of this generator set manual (OM-2029).

  • Page 36: Engine Control Panel (See Fig. 9)

    OM-2029 F. Engine Control Panel (See Fig. 9) The engine control panel is mounted directly below the control box. In addition to engine controls and instruments, generator output controls are mounted here. A plexiglass window in the canopy rear door, slants outward at the bottom to form an opening for access to controls when the door is closed.
  • Page 37 OM-2029 (b) Contactor control switches • This is another three-position, toggle switch identical to the engine-generator control switch. When placed in the spring loaded CLOSE position, it provides 115-V AC power di- rectly to a rectifier which supplies DC power for closing the load contactor. When released it returns to the normal ON position and continues to provide power to the rectifier, but in this switch position, AC power must pass through the plug interlock and fuse interlock re- lays.

  • Page 38: Power Module Panel Assembly

    OM-2029 1. Engine control panel 10. Indicator, No. 2 load contactor 2. Panel light 11. Switch, No. 1 load contactor 3. Engine ammeter 12. Switch, No. 2 load contactor 4. Oil pressure gage 13. Engine ON indicator light 5. Water temperature gage 14.

  • Page 39: Load Contactor

    OM-2029 (1) Load contactor Two load contactors are used in this unit. One contactor (8) serves output circuit No. 1, and the other contactor (9) serves output circuit No. 2. Each load contactor is a sealed unit which contains a magnetic operating coil and four sets of contacts.

  • Page 40: Overload Module

    OM-2029 (4) Overload module Each output of the generator set has an overload module (item 13 for No. 1 output, or item 14 for No. 2 output). Each overload module is a solid-state device designed to interpret a signal from a set of overload current transformers (item 5 for No. 1 output, or item 5 for No. 2 output) and to send a signal to the protective monitor module when an overload condition exists in any generator output phase.
  • Page 41 OM-2029 1. Power module panel 10. Rectifier, No. 1 contactor 2. Overload resistors, 25-watt, No. 1 output 11. Rectifier, No. 2 contactor 3. Overload transformers, No. 2 output 12. Capacitors, 0.1 mfd, 500-V 4. Overload resistors, 25-watt, No. 2 output 13.
  • Page 42 OM-2029 Output Terminal Panel Figure 11 September 30/89 Revised Page 24...

  • Page 43: Use, Storage, Or Shipping

    Generator sets for stationary mounting are in- stalled by the customer. Other generator sets, when ordered with truck or trailer, are mounted at the Hobart factory and are shipped in running condition and ready for operation after inspection and check.

  • Page 44: Installing Output Cables

    OM-2029 (6) Check air cleaner The air cleaner (Sect. 1-1, Fig. 3, item 7) is a “dry” type. Be sure there are no papers, tapes, or other material covering the air inlet area. C. Installing Output Cables Units are generally shipped without generator set-to-aircraft cables. (1) Three-phase, AC output cable assembly installation The AC output terminal panel access cover is located on the right side, just to the right of the en- gine control panel (see Fig.

  • Page 45: Preparation For Storage

    OM-2029 2. Preparation for Storage When a generator set is to be stored or removed from operation, special precautions should be taken to protect the internal and external parts from rust, corrosion, and gumming in the engine fuel system. A. General (1) The unit should be prepared for storage as soon as possible after being removed from service.
  • Page 46 OM-2029 This page intentionally left blank. September 30/89 Revised Page 4...

  • Page 47: Section 3. Operation

    OM-2029 SECTION 3. OPERATION 1.General This section contains information and instructions for the safe and efficient operation of the equipment. Operating instructions are presented in step-by-step sequence of procedures to be followed in supplying 400-Hz power to an aircraft. WARNING: IMPROPER OPERATION CAN KILL! EAR PROTECTION EQUIP- MENT MAY BE NECESSARY WHEN WORKING IN CLOSE PROXIMITY TO THIS EQUIPMENT.
  • Page 48 OM-2029 1. Panel light 15. Engine ammeter 2. Load contactor circuit breaker (2-A) 16. Engine circuit breaker (10-A) 3. Test-reset switch 17. Indicator, No. 1 load contactor 4. Protective system circuit breaker 18. Switch, No. 1 load contactor 5. Meter selector switch 19.
  • Page 49 OM-2029 30. Automatic voltage control rheostat 35. Damping circuit GAIN potentiometer 31. Foot compensation potentiometer 36. Test bank/aircraft switch, No. 1 output 32. Line-drop compensation ON/OFF switch 37. Test bank/aircraft switch, No. 2 output 33. Cable size potentiometer 38. Regulated/diagnostic switch 34.

  • Page 50: Cold Weather Engine Starting Procedures

    OM-2029 C. Cold Weather Engine Starting Procedures A cold weather starting-aid kit (Fig. 2) is provided to assist in starting the engine at temperatures be- low 50 degree F. To start the engine, using the starting aid, proceed as follows: (1) Position switches and controls as instructed in steps (1) and (3), paragraph B, Normal Engine Starting Procedures, above.

  • Page 51: Preparation For Power Delivery (Normal Automatic Voltage Control)

    OM-2029 (3) Cold weather starting procedures are exactly the same as for normal starting except: (a) Before cranking the engine, pull the starting aid control OUT to the full extent of its travel. Hold for 2 to 3 seconds. (This allows the starting aid valve chamber to fill with pressurized ethyl ether.) (b) Push the control IN.

  • Page 52: No. 2 Output Circuit

    (1) When delivering power from a T-R, prepare the generator set for DC power delivery the same as for AC delivery, except do not connect AC output cable and do not close AC load contactor. (2) For T-R operating instructions, see Hobart Manual No. OM-433. July 27/90 Revised...

  • Page 53: Simultaneous 28.5-V Dc And 115-V Ac Power Delivery

    OM-2029 Transformer-Rectifier Figure 3 B. Simultaneous 28.5-V DC and 115-V AC Power Delivery If both 28.5-V DC and 115-V AC must be delivered at the same time, the following rules and precau- tions must be observed. (1) Place T-R current limiting switch in OFF position. This will eliminate the soft start feature of the T- R, but will prevent AC voltage from dropping low enough to trip the AC load contactor.

  • Page 54: Trailer Operation (Optional)

    OM-2029 4. Trailer Operation (Optional) A. Towing Observe the following rules when towing the trailer. (1) Be sure all output cables are disconnected and properly stowed. (2) Be sure parking brake is released. (3) Avoid turns which are shorter than the steering linkage will freely allow. (4) Avoid dangerous speed and sudden turns.

  • Page 55: Chapter 2. Service

    OM-2029 CHAPTER 2. SERVICE SECTION 1. MAINTENANCE 1. General To make certain the generator set is always ready for operation, it must be inspected and maintained regularly and systematically so that defects may be discovered and corrected before they result in serious damage or failure of the equipment.

  • Page 56: Lubrication Schedule

    To assist in engine starting during cold weather when SAE-30 oil is used, an optional ether start- ing aid is available from Hobart Brothers Company. Multigrade oils are NOT recommended, and should be considered only as a “last resort” to facilitate engine starting.

  • Page 57: Air Cleaner Service

    OM-2029 ITEM MAINTENANCE REQUIRED Lube Oil Check oil level daily or after every 10 hours of use. Change oil after 200 hours or one month of use. Use heavy duty oil such as SAE-30 (MIL-L-2104B). Engine lube oil capacity: 18 quarts Lube Oil Filter Change oil filter every 200 hours or 1 month of use.

  • Page 58: Cartridge Installation (See Fig. 2)

    OM-2029 B. Cartridge Installation (See Fig. 2) (1) Carefully install the new cartridge into the housing. Avoid bumping the cartridge tubes against the housing sealing flange. Seat the cartridge properly within the housing. Press all edges and corners of the cartridge firmly with fingers to effect a positive air seal against the sealing flange of the housing. CAUTION: UNDER NO CIRCUMSTANCES SHOULD THE CARTRIDGE BE POUNDED OR STRUCK IN THE CENTER TO EFFECT A SEAL.

  • Page 59: Engine Cooling System

    OM-2029 6. Engine Cooling System A. General Cooling system device requires much more than maintaining the proper coolant level in the radiator. During warm seasons and in warm climates, plain water can be used as a coolant if the system is protected against rust by a rust inhibitor additive.

  • Page 60: Preparing The Coolant Solution

    OM-2029 CAUTION: (a) DO NOT USE “METHANOL” OR ALCOHOL AS AN ANTIFREEZE. (b) DO NOT USE TWO DIFFERENT TYPES OF ANTIFREEZE.MIXED SOLUTIONS (TWO TYPES) MAKE IT IMPOSSIBLE TO DETERMINE IF THE COOLING SYSTEM HAS ADEQUATE PROTECTION AGAINST FREEZING. (2) Checking coolant solution Check the solution frequently to be sure the cooling system has sufficient protection against freez- ing.

  • Page 61: Cleaning The Cooling System

    OM-2029 FREEZING POINT PERCENTAGE OF ANTI- (FARENHEIT) FREEZE IN SOLUTION +20 DEG +10 DEG 0 DEG 33-1/3% -10 DEG -20 DEG -30 DEG -40 DEG -50 DEG -60 DEG -70 DEG Antifreeze Solution Table Figure 3 F. Cleaning the Cooling System Drain and thoroughly flush the cooling system twice a year or more often if necessary.

  • Page 62: Generator Maintenance

    OM-2029 NOTE: If antifreeze solution is not premixed, pour required antifreeze in first. Install corrosion inhibitor according to directions on container. (3) Start the engine and allow it to idle. Add coolant if trapped air escapes from the system and the coolant level falls.

  • Page 63: Trailer And Truck Maintenance

    Lubricate and check wheel bearing adjustment each 800 hours or semiannually. Use a good quality bearing lubricant (See Figure 5). NOTE: The chart in Figure 4 shows the trailer assembly identified by Hobart Part No. 408595 and used with the basic generator set in this series, Specification 6906-1. Specifications 6906-3 and 6903-5 require trailers with fifth-wheel front running gear (Hobart Part No.
  • Page 64 OM-2029 Trailer Lubrication Chart (Trailer No. 408595 illustrated) Figure 4 March 16/90 Revised Page 10...
  • Page 65 OM-2029 Fifth-Wheel Lubrication Fittings Figure 4A SYMBOL NAME SPECIFICATION NOTES Grease, Automtive Federal Sinclair Litholene and Industrial VV-G-632 Industrial No. 2; Mobil-Mobilplex 47, or equivalent Oil, Engine, Heavy Military MIL-L-2104B SAE-30, Summer Duty or equivalent SAE-10, Winter Grease, Automotive Military MIL-G-10924B Wheel bearings or equivalent Lubricants...

  • Page 66: Checking Wheel Bearings

    OM-2029 E. Checking Wheel Bearings (1) Raise the vehicle until wheels are clear of floor. (2) Grasp the top of the tire with one hand and the bottom with the other hand. Push the top and pull the bottom, alternately, to check for looseness in the bearings. If looseness is detected, adjust the bearings as follows: F.

  • Page 67: Cleaning The Battery

    OM-2029 E. Cleaning the Battery If the top of the battery is dirty, it may be cleaned with a brush dipped in ammonia or soda solution. Disconnect lead connectors from battery posts. Vent plugs should be tightened to prevent cleaning so- lution from entering cells.

  • Page 68: Service Helps

    OM-2029 11. Service Helps A. Wiring All small wire leads are routed through plastic flexible conduit which protects them and makes a neat easily removable and replaceable wiring harness arrangement. This wiring method allows the replace- ment of a single wire lead with a minimum of difficulty. All wires are color coded. B.

  • Page 69: Section 2. Inspection/Check

    OM-2029 SECTION 2. INSPECTION/CHECK 1. General This section describes inspections and checks to be performed in conjunction with Inspection/Check Schedule, Figure 1. 2. Engine A. Fuel (See Fig. 1 for time schedules) (1) Check fuel quantity DAILY. (2) Drain fuel filters and change fuel filter elements in accordance with instructions in Perkins Shop Manual.
  • Page 70 OM-2029 Daily Weekly Weekly Monthly Monthly 6 Mo. 8 Hrs. 50 Hrs. 100 Hrs. 200 Hrs. 400 Hrs. 1200 Hrs. ENGINE Check fuel quantity Check crankcase oil level Check coolant level Change engine oil filter element Change engine oil Replace air cleaner cartridge Inspect cooling system hoses, tubes, fittings &...

  • Page 71: Electrical System (12-V Dc)

    OM-2029 3. Electrical System (12-V DC) A. Lights Check all lights for proper operation DAILY. Replace any defective lamps (bulbs) as soon as discov- ered. Figure 2 lists ALL lamps, their location, and part numbers. Light Lamp Lamp Identification Location Manufacturer Number Instrument Panel...

  • Page 72: Electrical System (115-V Ac)

    OM-2029 Item Protected Location Illustration Size & Type Instrument panel Engine control Sect. 1-1, Fig.9, 10A Circuit breaker lights & engine panel item 8 circuit Protective relay Generator Sect. 1-1, Fig.6, 2A Circuit breaker system control panel item 6 Voltage regulator Voltage regulator Sect.

  • Page 73: Trailer And Truck

    OM-2029 5. Trailer and Truck For Series 6906 generator sets that are truck-mounted, inspect the truck according to instructions in the truck manufacturer’s shop manual. For Series 6906 generator sets that are trailer mounted, a general visual inspection of the trailer on a trailer-mounted generator set should be done at the same time that routine maintenance (as required in Section 2-1) is done.
  • Page 74 OM-2029 This page intentionally left blank September 30/89 Revised Page 6...

  • Page 75: Section 3. Adjustment/Test

    OM-2029 SECTION 3. ADJUSTMENT/TEST 1. General Adjustment and test procedures are most applicable to testing and adjusting the generator set after a ma- jor repair, replacement of parts, or overhaul. 2. Generator Set Test A. Pre-operational Test Procedures (1) Connect cables from the generator output terminals to a load bank. Use cables of the same size and length as those to be used in service.
  • Page 76 OM-2029 1. Panel light 15. Engine ammeter 2. Load contactor circuit breaker (2-A) 16. Engine circuit breaker (10-A) 3. Test-reset switch 17. Indicator, No. 1 load contactor 4. Protective system circuit breaker 18. Switch, No. 1 load contactor 5. Meter selector switch 19.
  • Page 77 OM-2029 30. Automatic voltage control rheostat 35. Damping circuit GAIN potentiometer 31. Foot compensation potentiometer 36. Test bank/aircraft switch, No. 1 output 32. Line-drop compensation ON/OFF switch 37. Test bank/aircraft switch, No. 2 output 33. Cable size potentiometer 38. Regulated/diagnostic switch 34.
  • Page 78 OM-2029 (4) Again check for oil, fuel, and coolant leaks and correct any leaking condition. (5) Position switches and controls for automatic voltage regulation and power delivery as follows: (a) Place regulated-diagnostic switch (38, Fig. 1) in REGULATED position. (b) Place test-bank switch (36) in AIRCRAFT position. (c) Meter switch (5) may be in any position except pointing straight down.
  • Page 79 OM-2029 (19) Connect a source of 24-V DC power (two twelve-volt batteries connected in series) to terminals “N” and “F” (or “E”) at the output terminal panel. Connection polarity should be: MINUS to terminal N and PLUS to terminal E or F. (20) With test-bank switch in AIRCRAFT position, hold the No.
  • Page 80 OM-2029 (33) Operate at 125% rated load for 5 minutes immediately following the fullload run. The overload de- vice MUST trip within 5 minutes and the overload indicating light (12, Fig. 1) must come ON to indi- cate an overload condition. (34) Reduce load to normal.
  • Page 81 OM-2029 NOTE: The 4 to 12 second time delay is generally set at 5 seconds. (d) If the undervoltage circuit performs satisfactorily, return the unit to normal operation by adjust- ing the voltage to 115 V, pressing the reset switch, and closing the load contactor. (39) Check underfrequency sensing relay, protective monitor, and indicating light.

  • Page 82: Generator Set Adjustment

    OM-2029 3. Generator Set Adjustment A. Generator Adjustment The 400-Hz generator is a brushless type requiring no adjustments of any kind. B. Generator Control Adjustments The following items may require adjustment at some time during the life of the equipment. (1) 400-Hz Voltage Regulator To adjust 400-Hz voltage regulator, refer to TM-759 or OM-2020 for your particular regulator.

  • Page 83: Basic Engine Adjustments

    C. Basic Engine Adjustments Adjustment procedures applicable to the diesel engine are included in the John Deere Diesel Hand- book which accompanies this Hobart manual. Specific information for this particular engine is listed in Figure 3. D. Engine Accessories Adjustment (1) Generator and fan belt adjustment Refer to 2-1;...
  • Page 84 OM-2029 RULE 1. Adjust linkage to use FULL TRAVEL of actuator output shaft (1). RULE 2. Linkage must move speed control lever (7) from FULL IDLE to FULL SPEED position, or VERY CLOSE to FULL SPEED position in order for the generator to pull 125% load. Check and adjust linkage as follows, with engine stopped.

  • Page 85: Magnetic Pickup Adjustment

    OM-2029 (2) Magnetic pickup adjustment The strength of the magnetic pickup signal to the control box can be weakened if the tip of the pickup is too far from the flywheel ring gear. If the pickup is to be removed for any reason, or if the signal is weak (less than 2.5-V AC) as indicated by a voltage test at the pick-up with the engine running at rated speed, proceed as follows: (a) Disconnect “pull-apart”...

  • Page 86: Governor Control Unit Adjustment

    OM-2029 (3) Governor Control Unit Adjustment Before making an adjustment to the control unit (Fig. 6), make certain that linkage between actua- tor lever (3, Fig. 4) and fuel control lever (7, Fig. 4) is properly adjusted. There must be no lost motion or “play”...
  • Page 87 OM-2029 Electric Governor Controller: Illustration and Connection Diagram Figure 6 March 16/90 Page 13...

  • Page 88: Generator And Exciter Test

    OM-2029 5. Generator and Exciter Test The generator fields may be tested with a “Kelvin” bridge. This is a double-bridge type instrument required for the very low resistances encountered in this test. It is understood that 0 resistance indicates a SHORT CIRCUITED condition.

  • Page 89: Chapter 3. Troubleshooting

    OM-2029 CHAPTER 3. TROUBLESHOOTING SECTION 1. TROUBLE SHOOTING PROCEDURES 1. General A. Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until the exact cause of a trouble is found. As a rule, the best place to start looking for the cause of a trouble in a circuit is at the source of power.

  • Page 90: Equipment For Troubleshooting

    OM-2029 3. Equipment for Troubleshooting A good quality multi-scale voltohmmeter is the only instrument required for trouble shooting. At least two “jumper” leads with “alligator” clips and test prods will be required. The 12-V, engine electrical system may be used as a 12-V DC power source. If a test box, part number 388318-2, is available, tests may be made more quickly and accurately, however, the test receptacle connector (31, Fig.
  • Page 91 OM-2029 7. Checking Connections and Leads ALWAYS make a check of connections and leads to a component suspected of being faulty. With the ex- ception of a few instances, we will assume that connections and wiring have always been checked first and that power has not been lost as a result of defective wiring or connections.
  • Page 92 OM-2029 1. Panel light 15. Engine ammeter 2. Load contactor circuit breaker (2-A) 16. Engine circuit breaker (10-A) 3. Test-reset switch 17. Indicator, No. 1 load contactor 4. Protective system circuit breaker 18. Switch, No. 1 load contactor 5. Meter selector switch 19.
  • Page 93 OM-2029 30. Automatic voltage control rheostat 31. Foot compensation potentiometer 32. Line-drop compensation ON/OFF switch 33. Cable size potentiometer 34. Generator main overload relay 35. Test bank/aircraft switch, No. 1 output 36. Test bank/aircraft switch, No. 2 output 37. Regulated/diagnostic switch 38.
  • Page 94 OM-2029 End View of Voltage Regulator Amphenol Connector Figure 2 September 30/89 Revised Page 6...
  • Page 95 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY NOTE: Diesel engine trouble shooting is covered in Perkins Engine Shop Manual under Fault Diagnosis. ENGINE CONTROLS 1. Engine will not A. Batteries discharged, A. Check voltage across bat- start.
  • Page 96 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 3. Engine will not A. No fuel A. Before attempting to find start. Cranking the cause of “no fuel”, speed normal.prime the fuel filters by removing pipe plug in thecover of each.
  • Page 97 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 3. Engine will not (6) Faulty fuel pump (6) Check pump. start. Cranking speed normal. (a) Relief valve (a) An open relief valve not seating will cause low out- put pressure.
  • Page 98 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 5. Engine starts.Stops A. The shut-down circuit A. Restart the engine, hold after a few seconds may have functioned permissive start switch in by automatic shut- normally to stop the START position, and observe down.
  • Page 99 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 7. Engine will not A. 12-V DC power not A. Apply 12-V DC directly to come “up” to gov- reaching governor terminal 1 on governor con- erned speed in GEN control box due to trol box.
  • Page 100 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 7. Engine will not E. Defective control E. Connect a DC voltmeter to come “up” to gov- unit the leads from the control erned speed in GEN unit to the actuator.
  • Page 101 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 9. Engine is unsteady A. Fault in engine A. Before condemning the gover- (surges) under load nor system for surging, make certain the fault is not in the engine.
  • Page 102 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 11. Engine “misses”. A. Insufficient fuel A. Check fuel flow in accor- Runs unevenly. dance with John Deere Diesel Handbook. Repair or replace parts as required. Also see Engine, Trouble 3.
  • Page 103 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY ENGINE AND CONTROLS (CONTINUED) 1. No (or low) gener- A. Defective generator A. The first check is an easy ator output voltage or excitation circuit one which will allow the in all phases.
  • Page 104 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY GENERATOR EXCITATION CIRCUITS (CONTINUED) 1. No (or low) genera- C. Defect in VOLTAGE C. Check as follows: tor output voltage REG. excitation cir- in all phases. Gen- cuit. erator operating at 400 Hz in AUTOMATIC (1) Defective AUTO- (1) Check the switch thor-...
  • Page 105 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY GENERATOR AND EXCITATION CIRCUIT (CONTINUED) 1. No (or low) gen- (4) Defective Amph- (4) Disconnect voltage reg- erator output volt- enol connector at ulator Amphenol connec- age in all phases. voltage regu- tor (See TM-759 or OM-2020).
  • Page 106 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY GENERATOR CONTROLS AND INSTRUMENTS (CONTINUED) 2. No (or low) output B. Defect in manual voltage A. Check as follows: voltage when operating control portion in MANUAL mode of excitation circuit (Continued) (1) Defective AUTO- (1) Check contacts and oper-...
  • Page 107 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY NO. 1 LOAD CONTACTOR OPERATING CIRCUIT (CONTINUED) 1. Load contactor (K1) (2) Defective (open) (2) Use a jumper with clip will not close when relay in protective and prod terminals to control switch (20, module (1-1;...
  • Page 108 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY N0. 1 LOAD CONTACTOR OPERATING CIRCUIT (CONTINUED) 2. Load contactor (K1) A. 28.5-V DC is not A. Check voltage at terminal Z will close when reaching plug interlock on test receptacle. Voltage control switch (20, relay (K2) from should be 28.5-V DC.
  • Page 109 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY GENERATOR CONTROLS AND INSTRUMENTS (CONTINUED) 2. Load contactor will E. Defective fuse- E. Open protective relay tray close when control interlock relay (K17) and connect a jumper across switch (20, Fig. 1) or resistor (R46) the resistor R46) (Sect.
  • Page 110 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY PROTECTIVE CIRCUIT NOTE: The protective relays and protective monitor are not completely functional until the load contactor is CLOSED. Since it is not advisable to vary voltages for test purposes while delivering power to an aircraft, the generator should be connected to a load bank for trouble shooting the protective circuits.
  • Page 111 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY PROTECTIVE CIRCUIT (CONTINUED) 2. Load contactor B. Defective over-under B. Use rheostat to reduce opens during power voltage module (K26) voltage to 104 V. The delivery. Under- undervoltage indicating voltage indicating light should NOT come on light ON (Cont’d)
  • Page 112 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY PROTECTIVE CIRCUIT (CONTINUED) 4. Load contactor A. Electric governor B. Proceed as follows: opens during power improperly adjusted, delivery. Under- or malfunctioning frequency light ON. (1) Governor improperly (1) Adjust in accordance adjusted with Sect.
  • Page 113 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR Trou AND CONDITION PROBABLE CAUSE REMEDY GENERATOR 1. No (or low) voltage A. Shorted diode in A. Check diodes in accordance output exciter rectifier with Sect. 2-3, para. 6. If (CR2). diodes are good, proceed to (She step B.
  • Page 114 OM-2029 TROUBLE, SYMPTOM TEST, CHECK, AND/OR AND CONDITION PROBABLE CAUSE REMEDY EXTERNAL LOAD 4. Unbalanced output C. Defective connection A. Check plug and receptacle (Continued) in output circuit. connectors at aircraft. Tighten, repair, or replace as required. D. Break or cut in out- D.

  • Page 115: General

    The Illustrated Parts List identifies, describes, and illustrates main assemblies, subassemblies, and detail parts of the engine-driven generator sets manufactured by Hobart Brothers Company, Power Systems Group, Troy, Ohio, 45373. These sets are identified as Hobart Series No. 6906-1, 6906-2, 6906-3 & 6906-4.
  • Page 116 (2) HOBART PART NUMBER Column ALL part numbers appearing in this column are Hobart numbers. In all instances where the part is a purchased item, the vendor’s identifying five-digit code and his part number will appear in the NOMEN- CLATURE column.
  • Page 117 OM-2029 SECTION 2. MANUFACTURER’S CODES 1. Explanation of Manufacturer’s (Vendor) Code List The following list is a compilation of vendor codes with names and addresses for suppliers of purchased parts listed in this publication. The codes are in accordance with the Federal Supply Codes for Manufac- turer’s Cataloging Handbook H4-1, and are arranged in numerical order.
  • Page 118 OM-2029 CODE VENDOR’S NAME AND ADDRESS 18265 Donaldson Co. Inc., 400 W. 94th St., P.O. Box 1299, Minneapolis, MN 55440 19220 Eberhard Manufacturing Company, 21944 Drake Road, Strongsville, OH 44136 20038 ESB Inc., 5 Penn Center Plaza, P.O. Box 8109, Philadelphia, Pennsylvania 19101 21335 Fafnir Bearing Compan,y Division of Textron, 37 Booth Street, New Britain, Connecticut 06050...
  • Page 119 OM-2029 CODE VENDOR’S NAME AND ADDRESS 50603 H.B. Electrical Mfg. Co. Inc., 1125 National Pky., Mansfield, OH 44906 51377 Kysor of Cadilac, 1100 Wright St., Cadillac, MI 49601 51589 ST - SEMICON INC., 415 N. College Ave., Bloomington, IN 47401 57448 Allis Chalmers Corp., Stevens &...
  • Page 120 OM-2029 CODE VENDOR’S NAME AND ADDRESS 78388 Synchro - Start Products, Inc. Sub. of Knowles Electronics Inc., 8109 N. Lawndale Ave., P.O. Box 147, Skokie, IL 60076 79470 Dana Corp., The Weatherhead Division, 767 Beta Drive, Cleveland, OH 44143 81074 ITT - Holub Industries, 413 Elm Street, Sycamore, Illinois 60178 81518 Flexaust Co.

  • Page 121: Explanation Of Parts List Arrangement

    OM-2029 SECTION 3. PARTS LIST 1. Explanation of Parts List Arrangement The parts list is arranged so that the illustration will appear on a lefthand page and the applicable parts list will appear on the opposite right-hand page. Unless the list is unusually long, the user will be able to look at the illustration and read the parts list without turning a page.
  • Page 122 OM-2029 Generator Set Figure 1 September 30/89 Revised Page 2...
  • Page 123 . BATTERY COMPARTMENT 180466 . FUEL TANK 76A-1152 . . CAP, FUEL 180467 . SUPPORT, FUEL TANK 402987 . NAMEPLATE, HOBART 404101-1 . LIGHT, CLEARANCE, V75175, NO.514-0168 400613-10 . . LAMP, 12V 408670-1 . BATTERY, 12V 280038 . CLAMP, BATTERY HOLDDOWN 5CW-2048 .
  • Page 124 OM-2029 Generator Set on Fifth-Wheel Trailer (Specification 6906-6 Illustrated) Figure 1A July 27/90 Page 3A...
  • Page 125 . INSULATOR, SUPPORT, FUEL TANK 180447 . COMPARTMENT, BATTERY 281841 . BOX, BATTERY & CABLE, ASSEMBLY 402987 . NAMEPLATE, HOBART . BATTERY, 12V  C,F 281871-1 . CLAMP, BATTERY HOLDDOWN  280951 * Not Illustrated  This battery replaces the battery (Part No. 408670-1) that was used on earlier units ...
  • Page 126 OM-2029 This page intentionally left blank. July 27/90 Page 3C...
  • Page 127 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 1A - (CONTINUED) 5CW-2048 . ROD, BATTERY CLAMP 481209-2 . CABLE, BATTERY, POSITIVE 383067-2 . CABLE, BATTERY, NEGATIVE 180477 . SUPPORT, MTG., BATTERY BOX 281842 . BUMPER ASSEMBLY 282103 .
  • Page 128 OM-2029 Canopy Assembly Figure 2 September 30/89 Revised Page 4...
  • Page 129 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 280134 CANOPY ASSEMBLY (For NHA See Fig. 1) 280144 . CANOPY, TOP ASSEMBLY 280467 . PANEL, END FRONT, ASSEMBLY 280146 . DOOR, LT. FRT. & RT. REAR, LG., ASSY.
  • Page 130 OM-2029 Generator Set Without Canopy Figure 3 September 30/89 Revised Page 6...
  • Page 131 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY No Number GENERATOR SET WITHOUT CANOPY (For NHA See Fig. 1) No Number . RADIATOR AND COOLING SYSTEM GROUP (For Details See Fig. 4) 280512 . GUARD, FAN, RIGHT 280511 .
  • Page 132 OM-2029 This page intentionally left blank September 30/89 Revised Page 8...
  • Page 133 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY No Number GENERATOR SET WITHOUT CANOPY (CONTINUED) 403809-1 . SWITCH, LOW OIL PRESSURE 403782-0 . SWITCH, SHUTDOWN 280511 . GUARD, FAN, LEFT 280512 . GUARD, FAN, RIGHT 78B-1119-1 . SWITCH, TEMERATURE SENDER 281271 .
  • Page 134 OM-2029 Radiator and Cooling System Group Figure 4 September 30/89 Revised Page 10...
  • Page 135 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY No Number RADIATOR AND COOLING SYSTEM GROUP (For NHA See Fig. 3) 280164 . RADIATOR ASSEMBLY FW-2267-A . . CAP, RADIATOR 180441 . . HEAD, RADIATOR ASSY. 402257 . . GASKET, RADIATOR 384486 .
  • Page 136 OM-2029 Air Cleaner Assembly Figure 5 September 30/89 Revised Page 12...
  • Page 137 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 280103 KIT, AIR CLEANER, ASSY (For NHA See Fig. 3) REF 408592 . AIR CLEANER V18265, NO. FHG09-0024 408593 . CLAMP, MOUNTING, AIR CLEANER V18265, NO. P00-4073 84A-1006 . REDUCER, 2-3/4 - 4 408590 .
  • Page 138 OM-2029 Electric Governor Kit Figure 6 September 30/89 Revised Page 14...
  • Page 139 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 280240 KIT, ELECTRIC GOVERNOR, ASSY (For NHA See Fig. 3) 281774-2 . SENSOR, MAGNETIC GOVERNOR, V03613 84A-1009 . CONTROLLER, GOVERNOR, ELECTRIC V03613, NO. 8290-040 84A-1020 . GOVERNOR, ACTUATOR, ELECTRIC V03613, NO.
  • Page 140 OM-2029 Panel, Engine Control Assembly Figure 7 September 30/89 Revised Page 16...
  • Page 141 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 280172 PANEL, ENGINE CONTROL ASSY. (For NHA See Fig. 3) 280173 . PANEL, ENGINE CONTROL 84B-1003 . LIGHT, PANEL, 12V, V77977, NO. 431W 78A-1115-1 . AMMETER, V16476, NO. 06354 78A-1117-1 .
  • Page 142 OM-2029 Generator Control Box Assembly Figure 8 July 27/90 Page 18...
  • Page 143 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 180508-1 GENERATOR CONTROL BOX ASSEMBLY (For NHA See Fig. 3) 180508-2 GENERATOR CONTROL BOX ASSEMBLY (For NHA See Fig. 3) 280179 . PANEL, CONTROL GENERATOR ASSY. 84B-1003 . LIGHT, PANEL, 12V 402662 .
  • Page 144 OM-2029 This page intentionally left blank. September 30/89 Revised Page 20...
  • Page 145 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY GENERATOR CONTROL BOX ASSEMBLY (CONTINUED) 401937-5 . BLOCK, TERMINAL, 20A, V98410, NO. 35014-3523 400646-2 . RELAY, OVERLOAD 482038 . BOARD, OVER-UNDER VOLTAGE ASSY. 482039 . BOARD, OVER-UNDER FREQUENCY ASSY.
  • Page 146 OM-2029 Stator Terminal Panel Assembly Figure 9 September 30/89 Revised Page 22...
  • Page 147 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 385449 PANEL ASSY, TERMINAL, STATOR (For NHA See Fig. 3) W-11280-2 . NUT, PLAIN HEX, 1/4-20 W-11254-4 . WASHER, LOCK, 1/4 W-11242-5 . WASHER, FLAT, 1/4 A-25 . WASHER, INSULATING, V89873, NO. E6147D1 DW-1704 .
  • Page 148 OM-2029 Power Module Panel Assembly Figure 10 September 30/89 Revised Page 24...
  • Page 149 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 180463A-1 PANEL ASSEMBLY, POWER MODULE (For NHA See Fig. 3) 180463A-2 PANEL ASSEMBLY, POWER MODULE (For NHA See Fig. 3) 180462 . PANEL, POWER MODULE ASSEMBLY 404402-1 . RESISTOR, OVERLOAD BURDEN, 16.6 OHM, 25 WATT, V50508, NO.
  • Page 150 OM-2029 Generator Group Figure 11 September 30/89 Revised Page 26...
  • Page 151 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY No Number GENERATOR GROUP (For NHA See Fig. 3) 489350 . GENERATOR ASSEMBLY 480127A . COVER, FAN HOUSING 383295B . FAN & COUPLING ASSEMBLY 480646 . KEY, MACHINE FLEXIBLE COUPLING 384204 .
  • Page 152 OM-2029 Fuel Line Assembly Figure 12 September 30/89 Revised Page 28...
  • Page 153 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 280436 FUEL LINE ASSEMBLY A,C-F 400818-2 . NIPPLE, HEX, PIPE, STEEL 400819-1 . VALVE, BALL W-7814-8 . BUSHING, PIPE, STEEL, 3/4 X 1/4 W-10888-4 . ELBOW, MALE INVT., FLARE BRS.
  • Page 154 OM-2029 Trailer Assembly with Fifth-Wheel Front Running Gear (For Specifications 6906-3, 6906-5, and 6906-6) Figure 13 September 30/89 Revised Page 30...
  • Page 155 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 13 - 281363 TRAILER, RUNNING GEAR, 5TH WHEEL 10,000-POUND CAPACITY, V22938, No. PDI-786 (For NHA See Fig. 1) C,EF 76A-1147 . TIRES, 8.75 X 16.5, 10-PLY C,EF 76A-1256 . WHEEL ASSEMBLY, (For 8:75 X 16.5 in.
  • Page 156 OM-2029 This page intentionally left blank March 16/90 Page 32...
  • Page 157 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 13 - 281363 TRAILER ASSEMBLY (CONTINUED) C,EF 76A-1259 . BRACKET ASSEMBLY, HANGER, SPRING (Hook End), V22938, No. 4-4251 C,EF 76A-1261 . . BRACKET, HANGER, SPRING, V22938, No. 4251 C,EF 76A-1188 .
  • Page 158 OM-2029 This page intentionally left blank March 16/90 Page 34...
  • Page 159 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 13 - 281363 TRAILER ASSEMBLY (CONTINUED) C,FE 181837 . .WELDMENT ASSEMBLY, 5TH-WHEEL, V22938, No. 786-2346FZ C,EF 280763 . . PLATE, BEARING C,EF 281350 . . BRACKET, BEARING, PIVOT-ARM, ASSY.
  • Page 160 OM-2029 Brake Kit Assembly Figure 14 March 16/90 Page...
  • Page 161 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 14 - 76A-1278 KIT ASSEMBLY, BRAKE, V22938, No. 5-8214 (For NHA See Fig. 13) C,EF 80A-1066 . NUT, MOUNTING, BRAKE, V22938, No. 5-8214 C,EF 76A-1282 . WASHER, LOCK, MOUNTING, BRAKE, V22938, No.
  • Page 162 OM-2029 This page intentionally left blank March 16/90 Page 38...
  • Page 163 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 14 - 76A-1278 KIT ASSEMBLY, BRAKE, (CONTINUED) C,EF 76A-1347 . . STRUT, V14892, No. 302143 C,EF 76A-1348 . . PIN, ANCHOR, V14892, No. 310574 C,EF 76A-1349 . . PLATE, SHOE GUIDE, V14892, No.
  • Page 164 OM-2029 Solid State Voltage Regulator Assembly (Part No. 489812A) Figure 15 July 27/90 Page 40...
  • Page 165 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 15 - 489812A REGULATOR, VOLTAGE, ASSEMBLY (For NHA See Figure 8) 180075 CHASSIS, REGULATOR 430340 . CHASSIS, LINE DROP COMPENSATION, ASSY 430470 . . CHASSIS 402373 . . NAMEPLATE, LINE COMPENSATION W-11597 .
  • Page 166 OM-2029 Magnetic Amplifier Voltage Regulator Assembly (Part No. 281407) Figure 16 July 27/90 Page 42...
  • Page 167 OM-2029 NOMENCLATURE UNITS FIGURE HOBART ITEM NO. PART NO. 1234567 ASSY 281407 REGULATOR, VOLTAGE, ASSEMBLY (For NHA See Figure 8) 281399 . CHASSIS, REGULATOR 402342 . REACTOR, REGULATOR, 800 VA 430476 . INSULATOR, BOTTOM, RESISTOR W-9746-9 . RESISTOR, 1000-OHM, 25-WATT, V44655, No.
  • Page 168 OM-2029 This page intentionally left blank July 27/90 Page 44...
  • Page 169 OM-2029 SECTION 4. NUMERICAL INDEX 1. Explanation of Numerical Index The purpose of this index is to assist the user in finding the illustration and description of a part when the part number is known. Part numbers are arranged in alpha-numerical sequence. Thus, any part number beginning with the letter A would be located at or near the top of the index list.
  • Page 170 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER W-11254-4 W-11254-6 9-12 W-11278-5 W-11280-2 W-11280-3 W-2974N 8-35 W-7814-3 12-16 W-7814-4 4-24 W-7814-5 4-28 W-7814-8 12-3 W-799J-211 4-23, 6-12 W-8095A-9 8-21 W-8105A-4 8-20 W-9407-201 1A-13 W-9549-19 W-9746-1 10-8 W-9746-3 8-34 W-9916-10 8-19 100GH-112 100GH-117 2-15 100GHP-190...
  • Page 171 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 180492 2-16 180507 180508-1 3-15, 8-0 180508-2 3-0, 8-0 180509 8-37 180511 180522 180890 11-24 180903 1-17 180905 1-18 181029 1-15 181030 1-16 181066 4-21 181397 4-22 181556 11-27 181557 11-28 181558 181559 181834 13-3 181835...
  • Page 172 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 280165 280172 280172 3-14 280173 280179 8-22 280183 3-36 280184 8-10 280189 2-19 280239 280240 3-21 280240 280241 280243 6-11 280372 8-40 280436 12-0 280446 12-9 280466 280467 280511 3-3, 3-3 280589 2-18 280763 13-44 280951...
  • Page 173 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 363136-5 10-7 380522-1 11-21 383067-2 1-14,1A-25 383295B 11-3 384176-1 11-20 384178-1 11-8 384183A-1 11-15 384204 11-5 384486 385275 4-30 385449 3-20, 9-0 385450 9-15 385950 11-23 386751 2-9, 4-10 386921 10-11 387445 2-10 387736C 8-29 387738A...
  • Page 174 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 402662 402665-1 8-12 402826 8-11 402908 402987 1-7, 1A-20 403064 5-10 403091-4 7-11 403704-5 8-15 403704-6 7-10 403704-7 7-13 403782-0 3-30, 4-13 403809-1 3-29 404065-2 10-14 404100 7-12 404101-1 404154-16 404402-1 10-2 404553 13-5, 13-29 404554 13-6, 13-30...
  • Page 175 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 482989 6-10 483800 11-7 484661 10-4 486789 487750-1 1A-10 489190 1A-32 489350 11-1 489658-2 489658-4 10-17 489811 8-27 50GHP-90 56534 5-11 56534 12-13 56544 12-8 56553 4-20 56555 4-11 56564 4-15, 4-16 5CW-1932-0 5CW-2048 1-12, 1A-23 5CW-2127...
  • Page 176 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 76A-1278 13-28, 14-0 76A-1279 14-0 76A-1280 14-0 76A-1281 14-0 76A-1282 14-0 76A-1332 14-0 76A-1333 14-0 76A-1334 14-1 76A-1335 14-2 76A-1336 14-3 76A-1337 14-4 76A-1338 14-5 76A-1339 14-5 76A-1340 14-5 76A-1341 14-5 76A-1342 14-6 76A-1343 14-7 76A-1344...
  • Page 177 OM-2029 FIGURE AND PART NUMBER ITEM NUMBER 84A-1006 84A-1008-1 7-15 84A-1009 3-23, 6-2 84A-1020 84A-1075 84A-1091 84B-1003 7-2, 8-14 September 30/89 Revised Page 9...
  • Page 178 OM-2029 This page intentionally left blank. September 30/89 Revised Page 10...
  • Page 179 OM-2029 CHAPTER 5. OPTIONAL EQUIPMENT This chapter provides documentation covering any optional equipment furnished with your generator. Available options are listed below. OPTION NAME MANUAL HOBART Trailer, Four-Wheel OM-2029 408595 Trailer, with 5th-Wheel Front Running Gear OM-2029 281359 Transformer-Rectifier, 28.5-V DC (6906-3)
  • Page 180 OM-2029 This page intentionally left blank. September 30/89 Revised Page 2...
  • Page 181 Woodward Governor Company Electrically Powered Governor Engine John Deere Operators Manual No. 6466A Flexible Coupling Hobart Brothers Company Coupling Manual TM-736 Exciter Rotor Hobart Brothers Company Rotor Manual TM-360 Hobart Diagrams 280170 - Diagram, Connection & Schematic (6906-1 & 6906-2) 281403 - Diagram, connection &...
  • Page 182 OM-2029 This page intentionally left blank. September 30/89 Revised Page 2...
  • Page 183 OM-2029 UNUSUAL SERVICE CONDITIONS This information is a general guideline and cannot cover all possible conditions of equipment use. The specific local environments may be dependent upon conditions beyond the manufacturer’s control. The manufacturer should be consulted if any unusual conditions of use exist which may affect the physical con- dition or operation of the equipment.
  • Page 184 OM-2029 This page intentionally left blank. Unusual Service Conditions September 30/89 Page 2...

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