Onan MDGBA MDGCA MDGCB Genset Service Manual, Operators & Parts -3- Manuals - IMPROVED -

Printed in U.S.A. 960–0206B 4–2001 MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB (Spec D) MDGDC, MDGDD (Spec A) Parts Catalog MCGBA MCGCA MCGDA MCGDB MCGGA MDGDA MDGDB MDGDC MDGDD Marine Generator Set

SAFETY PRECAUTIONS The following symbols are used in Onan manuals to alert users to the potentially dangerous conditions relating to maintenence of equipment and replacement of parts. Please read and observe. This symbol warns of immedi- ate hazards which will result in severe personal injury or death. This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death. This symbol refers to a hazard or unsafe practice which can result in severe personal injury or product or property damage. MODEL IDENTIFICATION To avoid errors or delay in filling your parts order, al- ways give the MODEL, SPEC NO. and SERIAL NO. from the Onan nameplate. For handy reference, insert your nameplate information in the spaces below. MODEL AND SPEC NO. SERIAL NO. SOFTWARE VERSION AND DATE PRODUCT SAFETY PRECAUTIONS Contact with USED ENGINE OILS has been identified by a United States federal agency and some USA state agencies as causing CANCER or REPRODUCTIVE TOXICITY. When checking or changing engine oils take all necessary precautions not to ingest, breathe the fumes or contact the used oil. Contact with ASBESTOS has been identified by a United States federal agency and some USA state agencies as causing CANCER or REPRODUCTIVE TOXICITY. When handling engine gaskets take all necessary precautions not to ingest, breathe or contact the dust from the gaskets! Use adequate ven- tilation and wear protective gloves, masks and clothing! Contact with BENZINE and LEAD, found in gasoline, fuel additives and solvents has been identified by a United States federal agency and some USA state agencies as causing CANCER or REPRODUC- TIVE TOXICITY. When checking, draining or adding gasoline and fuel additives or using solvents take all necessary precautions not to ingest, breathe the fumes or contact the liquids. Use adequate ventila- tion and wear protective gloves, masks and protective clothing! Service and repair of Onan equipment must be performed by trained, experienced personnel only. Im- proper service or repair may result in property damage, severe personal injury or death. Do not use this catalog as a guide to servicing your equipment. Read and follow the IMPORTANT SAFETY INSTRUCTIONS in the Service Manual appropriate for the equipment you are working on.

1 Introduction This catalog applies to Onan Generator Models MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC and MDGDD as listed in the Generator Set Data Table. Parts are arranged in groups of related items and each illustrated part is identified by a reference number corresponding to the same reference number in the parts list. Parts illustrations are typical. Unless otherwise mentioned in the description or page heading, parts are interchangeable between models. Throughout this catalog left and right sides are determined by facing the engine end (front) of the set. Engine parts that have been modified or added by Onan are identified in this catalog. All other engine replacement parts must be ordered from the engine manufacturer by referring to the engine manufacturer’s nameplate and supplying all available information. Contact your nearest engine parts dealer for assistance in order- ing replacement parts. Replacement Engine Onan/Cummins Generator Model Cummins Engine Model 30MCGBA 4B 3.9-D(M) Configuration No. D381036MX02 35MCGBA 4B 3.9-D(M) Configuration No. D381036MX02 35MCGCA 4B T3.9-D(M) Configuration No. D382035MX02 45MCGCA 4B T3.9-D(M) Configuration No. D382035MX02 45MCGGA 6B 5.9-D(M) Configuration No. D401052MX02 55MCGGA 6B 5.9-D(M) Configuration No. D401052MX02 60MCGDA 6B T5.9-D(M) Configuration No. D402051MX02 65MCGDB 6B T5.9-D(M) Configuration No. D402051MX02 70MCGDA 6B T5.9-D(M) Configuration No. D402051MX02 90MCGDB 6B T5.9-D(M) Configuration No. D402051MX02 45MDGDC 6B T5.9-G Configuration No. D402012GX02 55MDGDC 6B T5.9-G Configuration No. D402012GX02 60MDGDD 6B T5.9-G Configuration No. D402012GX02 65MDGDA 6B T5.9-D(M) Configuration No. D402051MX02 70MDGDD 6B T5.9-G Configuration No. D402012GX02 75MDGDA 6B T5.9-D(M) Configuration No. D402051MX02 75MDGDB 6B T5.9-D(M) Configuration No. D402051MX02 95MDGDB 6B T5.9-D(M) Configuration No. D402051MX02 Replacement engines cannot be ordered from Onan. Order from your nearest Cummins distributor.

2 Generator Set Data Table Model and Electrical Data Battery Model and Specification Watts Volts Hertz Wire Phase Battery Voltage 30MCGBA* 35MCGBA* 35MCGCA* 45MCGCA* 45MCGGA* 30,000 35,000 35,000 45,000 45,000 # # # # # 50 60 50 60 50 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 45MCGGA 55MCGGA* 60MCGDA* 65MCGDB* 70MCGDA* 90MCGDB* 45,000 55,000 60,000 65,000 70,000 90,000 # # # # # # 50 60 50 50 60 60 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 45MDGDC* 55MDGDC* 60MDGDD* 65MDGDA* 70MDGDD* 75MDGDA* 75MDGDB* 95MDGDB* 45,000 55,000 60,000 65,000 70,000 75,000 75,000 95,000 # # # # # # # # 50 60 50 50 60 60 50 60 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 4 or 12 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC 12 or 24 VDC # – Broad range reconnectible. * – The specification number denotes customer requested options or deviations from a standard model. The specification letter advances (D to E, E to F, etc.) with major manufacturing changes.

Index 3 Actuator, Governor – Barber Coleman – MDGDC, MDGDD, 27 Actuator, Governor – MCGBA, MCGCA, MCGDA, MCGDB, MDGDA, MDGDB, 23 Actuator, Governor – MCGGA, 25 Actuator, Governor – Woodward – MDGDC, MDGDD, 28 Adapter, Generator, 75 Adapter, Generator Stator, 75 Adapter, Tachometer Takeoff Drive, 59 Adapter, Turbocharger, 53 Alternator (Isolated Ground Electrical System), 33 Alternator (Negative Ground Electrical System), 31 Ammeter – Engine Control (Optional), 91 Ammeter, AC Control, 93 Baffle Assembly, Generator Housing, 67 Base, Housing, 67 Bell, End – Generator, 77 Belt, V Ribbed – Alternator (Isolated Ground Electrical System), 33 Belt, V Ribbed – Alternator (Negative Ground Electrical System), 31 Block, Main Terminal, 71 Block, Terminal – Engine Control (Optional), 91 Block, Terminal – Generator Heater, 84 Box, Circuit Breaker, 101 Box, Circuit Breaker – Entrance Box, 104 Box, Engine Control – Optional, 91 Box, Engine Control – Standard, 89 Box, Terminal – Generator Heater, 84 Bracket. Automatic Voltage Regulator – MCGBA, MCGCA, 97 Bracket, Automatic Voltage Regulator – MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD, 99 Bracket, Circuit Breaker, 101 Bracket, Engine Mounting – MCGBA, MCGCA, 61 Bracket, Engine Mounting – MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD, 63 Bracket, Fuel Filter, 34 Bracket, Generator Mounting, 77, 83 Bracket, Lift, 72 Bracket, Low Oil Level – MCGBA, MCGCA, 38 Bracket, Low Oil Level – MCGDA, MCGDB, MCGCA, MDGDA, MDGDB, MDGDC, MDGDD, 39 Bracket, Remote Oil Filter, 42 Breaker, Circuit, 101 Breaker, Circuit (Automatic Voltage Regulator) – MCGBA, MCGCA, 97 Breaker, Circuit (Automatic Voltage Regulator) – MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD, 99 Breaker, Circuit – Engine Control (Optional), 91 Breaker, Circuit – Engine Control (Standard), 89 Cable, Oil Heater, 36 Cap, Coolant Recovery Tank, 45 Cap, Radiator – MCGBA, MCGGA, 46 Cap, Radiator – MCGCA, MCGDA, MCGDB, MDGDA, MDGDB, MDGDC, MDGDD, 53 Cartridge, Generator Heater, 84 Cleaner, Air – MCGBA, MCGGA, 19 Cleaner, Air – MCGCA, MCGDA, MCGDB, MDGDA, MDGDB, 18 Cleaner, Air – MDGDC, MDGDD, 21 Clutch, 65 Connection, Water Inlet – Heat Exchanger – MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, 55 Connection, Water Inlet – Heat Exchanger – MDGDC, MDGDD, 57 Control, Governor – Barber Coleman – MDGDC, MDGDD, 27 Control, Governor – MCGBA, MCGCA, MCGDA, MCGDB, MDGDA, MDGDB, 23 Control, Governor – MCGGA, 25 Control, Governor – Woodward – MDGDC, MDGDD, 28 Cooling System, 47 Cover Assembly, Generator – Housing, 69 Cover Assembly, Power Takeoff, 69 Cover, AC Control Panel, 93 Cover, Automatic Voltage Regulator – Control Housing, 71 Cover, Automatic Voltage Regulator – MCGBA, MCGCA, 97 Cover, Belt Guard, 44 Cover, Circuit Breaker – Bottom, 101 Cover, Circuit Breaker – Bottom (Entrance Box), 104 Cover, Circuit Breaker – Entrance Box, 104 Cover, Circuit Breaker – Front, 101 Cover, Circuit Breaker – Front (Entrance Box), 104 Cover, End Bell – Permanent Magnet Exciter, 85 Cover, Engine Control – Optional, 91 Cover, Engine Control – Standard, 89 Cover, Generator End Bell, 83 Cover, Intake Manifold, 53 Cover, Intake Manifold – MCGBA, MCGGA, 19 Cover, Lube Oil Filter – Remote, 42 Cover, Saddle – Side, 71 Cover, Saddle – Top, 71 Cover, Stator – Bottom, 75

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Onan MDGBA MDGCA MDGCB Genset Service Manual, Operators & Parts -3- Manuals - IMPROVED -

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