Master MGH8500IE Owner'S Operation And Installation Manual Download Page 1

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PORTABLE GASOLINE

GENERATORS

OWNER’S OPERATION AND INSTALLATION MANUAL

IMPORTANT: Read and understand this manual before operating or servicing
generator. Improper use of generator can cause serious injury. Keep this
manual for future reference.

Generator Model: MGH8500IE

120/240V

ISTLO

120/240V

ISTLO

120V

ISTLO

120V
GF

120V

HOU

R M

-ID

RES

RESE

RESET

OFF

FUEL

Summary of Contents for MGH8500IE

Page 1: ...g or servicing generator Improper use of generator can cause serious injury Keep this manual for future reference Generator Model MGH8500IE 12 0 24 0V TW ISTL OCK 12 0 24 0V TW ISTL OCK 12 0V TW ISTL OCK 12 0V GFC I 12 0V HOUR METE R AUTO ID LE RESET RESET RESET RESET OFF ON RE SE T TE ST EN M 00 00 00 05 HO UR S 1 1 0 E F F U E L ...

Page 2: ...Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this generator Safetyinformationappearsthroughoutthese instructions Pay close attention to them Below are definitions for the safety infor mation listed throughout this manual DANGER indicates a hazard which will causeseverepersonalinjury death orsubstan tial property d...

Page 3: ...s often if powered items overheat if electrical output drops if it is sparking if it produces smoke or flames if it vibrates at high levels if it has a damaged receptacle 12 Keep generator and nearby areas clean Keep generator free of oil mud and other foreign matter Remove anything that creates slip pery areas around generator Remove oily rags and other items that create fire hazards Keep a fire ...

Page 4: ...power Additional Features Circuit breaker protection Large fuel tank Oil alert system 15 Amp ground fault circuit interrupter GFCI receptacle Electric starter UNPACKING 1 Remove generator from carton 2 Remove any protective packaging ap plied to generator for shipment 3 Check for loose or missing parts Check for shipping damage If any parts are missing or damaged please contact our Technical Servi...

Page 5: ...age This system automatically shuts down the engine and prevents engine restarting if the oil level falls too low Note Whenthishappens theengineswitch remains in the ON position The oil alert system is wired into the ON OFF Switch If this system shuts down the engine the engine will not start until you add oil Add oil to engine see Engine Oil page 6 Note Operate generator on a level surface If not...

Page 6: ...use oil recom mended in engine owner s manual Note If oil level is too low oil alert system will shutdown engine and prevent engine from restarting Figure 6 Checking Oil Level FUEL WARNING Gasolinepresents a hazard of fire or explosion Gasoline is flammable Its vapor is explosive Keep fuel out of children s reach Refuel generator in a well ventedarea Donotfillfueltank in the dark Do not refuel whi...

Page 7: ...n system This system con sists of the battery mounting bracket hook bolts and nut see Figure 9 To Engine Block To Starter Solenoid Ampere AWG for Length of Load Cord in Feet 50 100 150 2 18 18 18 3 18 18 18 4 16 16 16 5 16 16 16 6 16 16 14 8 16 14 12 10 16 14 12 12 14 14 12 14 14 12 10 16 12 12 10 20 10 10 8 EXTENSION CORDS Only use grounded extension cords Be sure touseextensioncordwithproperwire...

Page 8: ...tility circuit Personal injury equip mentdamage ordamagetohome could occur GENERATOR GROUNDING Ground Wire Alternator Copper or Brass Grounding Point Figure 11 Grounding Generator WARNING For a grounding point do not use metal pipe be ing used to carry combustible materials or gases Grounding generator helps prevent electric shockfromagroundfaultcondition Follow these steps to ground your generato...

Page 9: ...d watt age of generator For rated wattage of your generator see Specifications page 4 Elec tric motors present a special problem when figuring load Read Step 3 carefully 1 Make two lists of items you want pow ered by generator List all motors and motorpoweredappliancesinone Listall lights small appliances etc in the other For standby service to home or building only include items you must power 2 ...

Page 10: ...rning engine operation DANGER Neverconnectgen erator to any existing electrical circuits Thegeneratoroutputwill back feed into the utility power line Thismayelectrocuteapower companylinerepairperson Also if generator is powering electri calcircuits thechanceofanelec trical fire exists DANGER Use only in well ventedareas Makesureareahas plenty of free moving fresh out side air Never run generator i...

Page 11: ...START position see Figure 15 Hold it there until engine starts When engine starts let switch return to the ON position IMPORTANT Do not use electric starter more than five seconds Starter motor damage may occur If engine fails to start release the switch and wait ten seconds After ten seconds try start ing again Note If engine does not start check the oil in the crankcase Add oil as nec essary Be ...

Page 12: ... first Voltage sensitive items include TVs VCRs and other home electronic items OPERATION Continued WARNING Alwayssettheidle speedbeforeturningontheAuto Idle If idle speed is not set the largerresistoronthecontrolboard may become hot Heat from the resistor may damage the protec tive coating on the control board Adjusting the Idle Speed IMPORTANT Adjust the idle speed only If the idle speed becomes...

Page 13: ...uum to clean air inlet and outlet louvers of alternator CAUTION Shut off generator before performing maintenance CAUTION The engine speed is preset The throttle is locked in preset position Do not adjust throttle Preset position lets en gine run at 3600 RPM under load The engine must maintain 3600 RPM for generator to create cor rect voltage Running engine at lower speeds will damage gen erator an...

Page 14: ...oth diodes on rotor 3 Check resistance of coils see Electri cal Component Specifications page 15 4 Replace capacitor 1 Set engine speed to 3720 RPM 62 Hz with no load 1 Replace both diodes on rotor 2 Do not overload generator 3 Contact an authorized engine service center Note For additional help visit DESA Specialty Products technical service web site at www desatech com www desatech com Note See ...

Page 15: ...rimary MFD Diodes 2 Model Winding Winding Winding 450 Volt 1000 Volt MGH8500IE 0 431 0962 7 782 45 8 Amp ELECTRICAL COMPONENT SPECIFICATIONS Connect T2 green and T3 black Measure resistance between T1 red and T4 blue Resistance between brown and white leads Remove diodes to check resistance ...

Page 16: ...ound To Solenoid Green Yellow To Roll Cage Yellow White White Blue Red Black Blk Blk Blk Black Red Red Red Red Red Red Red Green Green 120 240V 20A 30A Receptacle 120 240V 20A 30A Receptacle 120V 30A Receptacle 120V 15A Receptacle 120V 20A Receptacle White Wht Wht Wht Wht Wht Wht White White White White Auto Idle Stator 110 120V T1 T2 T3 T4 L2 L1 110 120V 220 240V Rotor Auxiliary Phase Diode Diode...

Page 17: ...d Taptite 8mm Screw 4 10 WLE 5 Lock Washer 5 16 4 11 115315 01 Bearing 1 12 115316 01 Diode 2 13 Rotor Alternator 1 14 115317 01 Fan 1 15 Bolt 3 8 16 x 5 8 4 16 Lock Washer 3 8 4 17 115242 01 Flange Alternator 1 1 2 3 6 5 4 8 9 10 7 11 12 15 16 17 13 14 ILLUSTRATED PARTS LIST Alternator Assembly This list contains replaceable parts used in your generator When ordering parts follow the instructions...

Page 18: ...TWISTLOCK 12 0V GFCI 12 0V HOUR METER AUTO IDLE RESET RESET RESET RESET OFF ON RE SE T TE ST EN M 00 00 00 05 HO UR S 1 1 0 E F F U E L Unleaded Gasoline Only SAFETY INFORMATION 17 8 15 10 12 11 13 11 12 16 14 15 16 9 14 15 1 2 14 3 4 6 5 7 14 ILLUSTRATED PARTS LIST Fuel Tank and Roll Cage ...

Page 19: ...ank with 90 fitting 1 3 114787 01 Screw 1 4 28 x 3 4 4 4 WP 4C Washer 1 4 4 5 19508001 Gas Line Clamp 2 6 25985005 Fuel Line 1 7 099743 01 Fuel Filter 1 8 115398 01 Roll Cage 1 9 M10908 27 Screw 10 32 x 1 2 6 10 114685 02 Spacer 1 11 Bolt 5 16 18 x 1 2 2 12 WLE 5 Lock Washer 5 16 2 13 099853 02 Shock Mount 1 14 NEC 5C Lock Nut 5 16 18 4 15 WP 5C Flat Washer 5 16 3 16 099853 03 Shock Mounts 2 17 11...

Page 20: ...0 115407 PORTABLE GASOLINE GENERATORS R Control Board Assembly and Mounting Solenoid Assembly and Mounting 6 5 7 4 3 2 DESA T1 1 ILLUSTRATED PARTS LIST Solenoid and Control Board Assemblies and Mounting ...

Page 21: ...O NUMBER DESCRIPTION QTY 1 115812 01 Control Board Assembly Includes Circuit Board Locking Supports 1 2 100324 03 Solenoid Assembly Includes Plunger Nut and Lock Washer 1 3 102939 01 Solenoid Mounting Bracket 1 4 103811 01 Nylon Washer 1 5 103812 01 Retaining Ring 1 6 100755 02 Linkage Rod 1 7 22822000 Roll Pin 1 PARTS AVAILABLE NOT SHOWN 100320 01 Yellow Wire 1 100322 01 White Wire with 2 Flags 1...

Page 22: ... 02 Screw 8 18 x 1 2 6 13 100366 01 Rocker Switch 1 14 115812 01 Auto Idle Control Board Kit 1 114721 03 Control Panel Assembly 1 114963 02 Panel Schematic Decal 1 103258 02 Solenoid Assembly Kit with Bracket 1 ILLUSTRATED PARTS LIST Control Panel This list contains replaceable parts used in your generator When ordering parts fol low the instructions listed under Replace ment Parts on page 23 of t...

Page 23: ...NT PARTS AND ACCESSORIES For original replacement parts and accesso ries contactyournearestAuthorizedDealer or Authorized Service Center for this prod uct If they can not supply the part or acces sory contactyournearestPartsCentrallisted below EachAuthorizedDealer Authorized Service Center and Parts Central is inde pendently owned and operated See pages 17 through 22 for an Illustrated Parts List ...

Page 24: ...tion modification tampering contaminated fuels repair using improper parts or repair by anyone other than an authorized dealer or service center Routine maintenance is the responsibility of the owner Travel handling transportation and incidental costs associated with warranty repairs are not reimbursable under this warranty and are the responsibility of the owner To the full extent allowed by the ...

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