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Home›Engines›Cummins/Onan KTA50-G11

Cummins/Onan KTA50-G11 Engine

The Cummins/Onan KTA50-G11 is an engine. It powers generator sets from Cummins/Onan, including the 1250DFLC.

Also known as: Cummins KTA50-G11

Part of the Cummins/Onan KTA50 engine family — 16 variants share parts & fitment.

On this pageSpecsGenerator setsFAQ

Engine specifications

Common problems

15
  • Over Current 1471
  • Low Coolant Level 197
  • Weak Battery 1442
  • Under Frequency 1448
  • Too Long in Idle 2342
  • Speed/Hz Match 1469
  • Speed Signal Lost 121
  • Shutdown After Battle Short 1123
  • Short Circuit 1445
  • Remote Emergency Stop 1434
  • Pre-Low Oil Pressure Sensor 143
  • Pre-High Cool Temp 146
  • Power Down Failure 1417
  • Overspeed 234
  • Over Frequency 1449

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan KTA50-G11.

Parts cataloged across the Cummins/Onan KTA50 family

300
Part #DescriptionCategory
140-2096Element, Primary (Outer)Air filter
140-2098Air Cleaner - Throwaway TypeAir filter
140-2467Element, Safety (Inner)Air filter
140-2501Cleaner, Air (Disposable)Air filter
140-2502Band, Mounting – Air CleanerAir filter
140-2503Bracket, MountingAir filter
140-3163Cleaner, Air (No Replaceable Element)Air filter
140-3230Cleaner, Air (Includes Elements - See Ref. No. 25 and 26)Air filter
309-0272Regulator, Voltage - 24 VDC (Used on 35 A MP Alternator)Alternator
309-0561Alternator & Drive Components Group Pulley. Alternator - Multi Groove (Use with 35 A MP Alternator)Alternator
503-1743-01Alternator & Orive Components Group Pulley, Alternator - Multi Groove (Use with 35 AMP Alternator)Alternator
206587CAP, MAIN BEARINGBearing cap
206588CAP, MAIN BEARINGBearing cap
98-5347Decal - Caution Fan Drive & Lube Components Group Belt.Belt
106069SCREW, HEXAGON HEAD CAPBolt
205584SCREW, TWELVE POINT CAPBolt
206028SCREW, SOCKET HEAD CAPBolt
3032633SCREW, TWELVE POINT CAPBolt
3177945SCREW, HEX FLANGE HEAD CAPBolt
3628452SCREW, HEXAGON HEAD CAPBolt
S-112SCREW, HEXAGON HEAD CAPBolt
205684BRACKET, LIFTINGBracket lifting
205230BUSSINGBushing
0300-4623-29DFLB (600V)Current transformer
0300-4623-30DFLC (600V)Current transformer
0300-4623-52DFLB BR (0-480V)Current transformer
0300-4623-54DFLC BR (0-480V)Current transformer
3178803CYLINDER BLOCK OPTION BP6089Cylinder block
3178910CYLINDER BLOCKCylinder block
148582DOE, PINDowel pin
70662DOE, PINDowel pin
3629497DRAINCOCKDraincock
206224PLUG, EXPANSIONExpansion plug
206742PLUG, EXPANSIONExpansion plug
3629168PLUG, EXPANSIONExpansion plug
122-0757Filter. Water - W/Corosion Inhibiting ChemicalFilter
159-1445Reservoir, FuelFluid
FS1216Fuel/Water Sep Spin-OnFuel filter
121-0113Gasket, PumpGasket
121-0117Gasket, Hand HoleGasket
205059WASHER, PLAINGasket
3002993DOE, RINGGasket
3025485WASHER, PLAINGasket
3176857DOE, RINGGasket
3178450WASHER, PLAINGasket
3178457WASHER, PLAINGasket
M-4352581Upper Gasket SetGasket
S-604WASHER, LOCKGasket
S-610WASHER, LOCKGasket
338-2529Harness. WiringHarness
128-0108Insulation, Hose – Bulk (Order By The Foot – 12 Feet Required)Hose
130-3538Chemical DCA4 Service Pre-Charging Complete SystemHose
130-3576Clamp, HoseHose
130-5588-02Tube, Water HeaterHose
130-5589-02Tube, Water HeaterHose
130-5590-02Tube, Water HeaterHose
130-5591-02Tube, Water HeaterHose
338-2925Hose, RadiatorHose
501-0704Line, Flexible Fuel - Fuel OutHose
501-0707Line, Flexible Fuel - Fuel InHose
502-1162Connector, Hose (3/8")Hose
503-0183Clamp, HoseHose
503-0685Clamp, HoseHose
503-0868Clamp, Hose - T-Bolt Type (3.5" NON)Hose
503-1140Hose, RubberHose
503-1484Elbow, Hose (45 Deg) (7" ID)Hose
503-1620Hose – Bulk (3/8" ID) (Order by the Foot)Hose
503-1727Hose, Radiator (3” ID x 10”)Hose
503-1728Hose (3” ID x 5–1/2”)Hose
503-1870-11Clamp, HoseHose
503-1870-12Clamp, HoseHose
505-0324Hose. Bulk (Sold by the Foot) Two Feet Required Nipple, Pipe - Half (3/4 NPT x 2"LG)Hose
518-0548-24Clamp, HoseHose
98-5759Drive - Multi Groove Hose, Flexible - Lube (Grease)Hose
98-5842Clamp, Hose - T-Bolt Type (3.5" NON)Hose
3375004Dial Indicator Kit for injector and valve adjustmentInjector
3822575Injector and valve adjustment kitInjector
3011884INSERT, LINERInsert liner
3019150INSERT, LINERInsert liner
3021148INSERT, LINERInsert liner
206580BEARING, MAINMain bearing
206581BEARING, MAIN A/R No.2,3,4,5,6,7,&8, UpperMain bearing
206582BEARING, MAIN A/R No.2,3,4,5,6,7,&8, UpperMain bearing
206583BEARING, MAIN A/R No.2,3,4,5,6,7,&8, UpperMain bearing
206584BEARING, MAIN A/R No.2,3,4,5,6,7,&8, UpperMain bearing
206590BEARING, MAINMain bearing
206591BEARING, MAIN A/R No.2,3,4,5,6,7,&8, LowerMain bearing
206592BEARING, MAIN A/R No.2,3,4,5,6,7,&8, LowerMain bearing
206593BEARING, MAIN A/R No.2,3,4,5,6,7,&8, LowerMain bearing
206594BEARING, MAIN A/R No.2,3,4,5,6,7,&8, LowerMain bearing
206600BEARING, MAINMain bearing
206601BEARING, MAIN A/R No.1&9, UpperMain bearing
206602BEARING, MAIN A/R No.1&9, UpperMain bearing
206603BEARING, MAIN A/R No.1&9, UpperMain bearing
206604BEARING, MAIN A/R No.1&9, UpperMain bearing
206610BEARING, MAINMain bearing
206611BEARING, MAIN A/R No.1&9, LowerMain bearing
206612BEARING, MAIN A/R No.1&9, LowerMain bearing
206613BEARING, MAIN A/R No.1&9, LowerMain bearing
206614BEARING, MAIN A/R No.1&9, LowerMain bearing
3018210SET, MAIN BEARING STANDARDMain bearing set
3018211SET, MAIN BEARING A/R .010 Inch O/SMain bearing set
3018212SET, MAIN BEARING A/R .020 Inch O/SMain bearing set
3018213SET, MAIN BEARING A/R .030 Inch O/SMain bearing set
LF3325Full-flow spin-on lubricating oil filter elementOil filter
016-40820Harness, Wiring (Includes Cable Ties and Terminals)Service part / kit
102-1335Plug, Oil DrainService part / kit
121-0116Cover, Hydraulic HoleService part / kit
130-2981Cap. Radiator - 7#PSIService part / kit
130-3758Radiator (includes Cap)Service part / kit
140-1260Fitting, Safety FilterService part / kit
140-1548Indicator, ServiceService part / kit
140-2097Cleaner, Air (Includes Elements)Service part / kit
140-2099BandService part / kit
140-2395Tube, Air InletService part / kit
140-2504-01Bracket - Right SideService part / kit
140-2504-02Bracket - Left SideService part / kit
140-2508Tube, Air Inlet (7" x 9" - 3/4")Service part / kit
140-2509Tube, Air InletService part / kit
140-2515Bracket, MountingService part / kit
140-2519Tube, Air InletService part / kit
140-2521Tube, Air InletService part / kit
140-2528Shield – Air In HeatService part / kit
300-2856Board Assy, Printed CircuitService part / kit
300-2863Board Assy, Printed Circuit - Relay Assembly- (A14)Service part / kit
3007525(3022157) KIT, LINER LINER, CYLINDERService part / kit
301-9054-01Decal - Panel Front Markings (Control With Meters)Service part / kit
301-9054-02Clip - FastenerService part / kit
301-9054-03Clip - FastenerService part / kit
3012611CYLINDER LINER (O/S) KIT, LINER A/R .020 inch O/SService part / kit
3012612CYLINDER LINER (O/S) KIT, LINER A/R .030 Inch O/SService part / kit
302-1720Meter, Frequency (M23)Service part / kit
302-1753Ammeter (M22) See Current Transformer & Ammeter Installation Figure for Parts)Service part / kit
302-1800Ammeter (M22) Scale in Amps as Indicated 0-2000/0-4000 (600 VAC Application) 0-3000/0-6000 (120-480 VAC Application)Service part / kit
302-1908Screw. Cap - Hex Head (M8-1.25 x 35MM)Service part / kit
305-0813-01Battery charger, Onan, 120V, 375WService part / kit
305-0818-02EOOO-21002Service part / kit
307-1056Relay. 24 VDCService part / kit
307-19872 307-1056 3 3 815-0388 6 4 323-0804 3 5 815-0544 3 6 319-0447 1 7 NOTE 1 REF 8 NOTE 2Service part / kit
308-0882Decal - Panel Front Markings (Control Without Meters)Service part / kit
309-0436Decal - Model Identification ONAN GEN SET CUMMINS GEN SET CUMMINS ONAN GEN SETService part / kit
309-0437(222"F)Service part / kit
309-0635-02Valve, CheckService part / kit
3096680Piston STC 13.8:1 RatioService part / kit
3096681Piston KT Series 15.5:1 RatioService part / kit
3096682Piston KTA Series 14.5:1 RatioService part / kit
3096683Piston 13.5:1 RatioService part / kit
3096684Piston KTA 15.7:1 RatioService part / kit
3096685Piston STC 13.9:1 RatioService part / kit
319-0447Screw. Machine - Pan Head. Cross-Recessed Drive (#6-32 x 1/2")Service part / kit
319-0754Tie. CableService part / kit
322-0363Component 322-0363Service part / kit
323-0804Screw. Machine - Round Head with IT Lock Washer (#6-32 x 1/2")Service part / kit
323-1200# Socket, Contact (Used in J1, J2)Service part / kit
323-1304tiotming, UmectorService part / kit
323-1306Genset component (SJB series)Service part / kit
3318201Battery Cable GroupService part / kit
332-0052Clamp, LoopService part / kit
332-0607Block, Terminal (T81)Service part / kit
332-1279Terminal. Lug - Ring (3/8Service part / kit
332-1292Terminal Board (Includes Parts Marked #)Service part / kit
332-1445Tie, Cable 18 98-5219 1 Decal - Panel Front (Not I l l u s t r a t e d ) 19 98-5220 1 DecalService part / kit
332-1673Terminal, Wire - SpadeService part / kit
332-2634Clamp, HoseService part / kit
332-2723Strip. MarkerService part / kit
333-0677-01Heater, Coolant - 4990 WattService part / kit
333-0677-02Heater, Coolant - 6420 WattService part / kit
3375005Dial indicator extensionService part / kit
3375007Support Plate / Support Block for dial indicatorService part / kit
338-1835Harness, Wiring (A13 to A l l )Service part / kit
338-1836Harness, Wiring (A14 to All) (Relays)Service part / kit
338-1904Harness. Wiring (A15 to All)Service part / kit
338-2278Harness. Wiring - AC (Includes Terminal Block & Cable Ties) [Used only with meters]Service part / kit
338-2532Terminal. Lug - Forked (No. 6 Screw)Service part / kit
355-0093Voltmeter (M21) Dual Scale 0-300/0-600V Single Scale 0-750VService part / kit
3628731Piston STC KitService part / kit
3630913Piston KTA-50-G7Service part / kit
3631241Piston Kit STC 13.9:1 RatioService part / kit
3631242Piston Kit 13.5:1 RatioService part / kit
3631243Piston Kit KTA 15.7:1 RatioService part / kit
3631244Piston Kit KTA Series 14.5:1 RatioService part / kit
3631245Piston Kit KT Series 15.5:1 RatioService part / kit
3631246Piston Kit STC 13.8:1 RatioService part / kit
3801268CYLINDER LINER (O/S) KIT, LINER A/R .040 Inch O/SService part / kit
3803530Piston Assembly STCService part / kit
3804747Piston Kit KTA-50-G7Service part / kit
3804885Piston KTA-50-G8/G9Service part / kit
406-0333Component 406-0333Service part / kit
406-0334Clip, Retaining - Turnbutton FastenerService part / kit
4089847Piston Kit GTA38/19Service part / kit
4090013Piston Kit KTA-38-M2Service part / kit
4090029Piston Kit QSK19CEService part / kit
4090181Piston GTA38/19Service part / kit
4097889Piston KTA-38-M2Service part / kit
4910463Piston QSK19R/MService part / kit
4910465Piston QSK SeriesService part / kit
4916177Piston GTA/GQSK19Service part / kit
4918058Piston QSK19CEService part / kit
4922319Piston QSK19CService part / kit
4955233Piston Kit QSK19R/MService part / kit
4955235Piston Kit QSK SeriesService part / kit
4955236Piston Kit QSK19CService part / kit
4955238Piston Kit GTA/GQSK19Service part / kit
501-0520Screw, Cap - Hex Head (3/8-24 x 5/8")Service part / kit
501-0524Washer, Lock - EIT (3/8")Service part / kit
501-0558Line. Flexible - BypassService part / kit
503-1717Elbow, Reducer (45 Deg) (7" ID to 6" ID)Service part / kit
503-1720Insert, Reducer (6" OD to 5-1/2" ID)Service part / kit
503-1730503-0183 21 503-1731 22 505-0324 23 504-0171 24 505-0102 25 505-0132 26 505-0102 27 28 29Service part / kit
504-0028Valve, Radiator DrainService part / kit
505-0007Belt. Drive - Multi Groove (Used with 35 A MP Alternator * Pulley, Alternator - Multi Groove (Use with 75 A MP Alternator)Service part / kit
505-0017Bushing, Pipe – Reducer (3/8" to 1/4")Service part / kit
505-0021Bushing, Pipe - Reducer (3/4º to 1/2º)Service part / kit
505-0100Nipple, Pipe - Close (1/2”)Service part / kit
505-0102Filter. Water - W/Corosion InhibitingService part / kit
505-0117Bushing, Reducer - Flush, Brass (1/2' NPT x3/8° NPT)Service part / kit
505-0132Nipple, Pipe - Close (3/4 NPT x l-3/8"LG) Elbow. Pipe - 90* (3/4 NPT)Service part / kit
505-0376Elbow – 45 Deg (3/8")Service part / kit
508-0015Washer, Insulating - Fiber (#8)Service part / kit
511-0161-02.*Service part / kit
517-0131Capacitor (Used across Voltmeter Terminals on some Sets)Service part / kit
518-0548-42Clamp, Retainer 4 Prior To December 1996 Production (Mounted On Top And Side Of Control Box Wrapper)Service part / kit
526-0030Washer, Flat (3/8")Service part / kit
800-0055Screw, Cap – Hex Head (3/8–16 x 2-1/4")Service part / kit
800-0062Nut, InsulatedService part / kit
800-0094Screw, Cap – Hex Head (1/2–13 x 2")Service part / kit
800-0270DCA4 Service Pre-Charging Complete SystemService part / kit
800-2060Screw, Cap - Hex Head (M8x 1.25 x35)Service part / kit
809-0035Screw, Machine - Thread Cutting, Round Head (#8 X 3/4')Service part / kit
812-0063853-0003 300-2856 338-1836 812-0063 853-0003 300-2863 338-1835 332-1445 NOTE 1 NOTE 2 332Service part / kit
812-0065Screw, Machine - Round Head (#6 - 32 x 5/8')Service part / kit
812-0084Screw. Machine - Round Head (Service part / kit
815-0388Bracket. Mounting - Relay Lead(s), Electrical Wire, Electrical - 20 AW G, Insulated Terminal, Wire - Forked, 18-20 GaugeService part / kit
815-0544Screw, Machine - Round Head IT Washer (#6 - 32 x 1/2')Service part / kit
821-0004Screw, Self-Locking - HexService part / kit
821-0029Screw, Self–Locking – Hex Washer Head (3/8–16 x 3/4")Service part / kit
821-0033Screw, Self–Locking – Hex Washer Head (7/16–14 x 3/4")Service part / kit
821-5004-03Screw, Self-Locking – Hex Washer Head (3/8–16 x 1")Service part / kit
850-0050Washer, Lock - Spring (3/8”)Service part / kit
853-0003Washer, Lock - ET (#6)Service part / kit
856-0008Washer, Lock - EIT (5/16'1)Service part / kit
856-0010Washer, Lock - EIT (3/8')Service part / kit
870-0131Nut. Hex - with ET (#10-32)Service part / kit
870-0196Nut, Insulating (#8)Service part / kit
870-0281Nut, Self-Locking – Hex Washer Head (3/8–16)Service part / kit
900-0181PCC Control Service ManualService part / kit
903-0128NAService part / kit
903-0208NAService part / kit
903-0608NAService part / kit
98-4732CautionService part / kit
98-4798Decal - Caution "7# PSI HOT WATER SYSTEM"Service part / kit
98-5298Decal - Panel Rear Markings (All Control Panels)Service part / kit
98-5299Decal - Panel Rear Markings (All Control Panels)Service part / kit
98-5316Decal - Panel Rear Markings (All Control Panels)Service part / kit
98-5387Nut, Self-Locking - with ET Lockwasher (#10-32)Service part / kit
98-5393Screw, Tapping - Round Head (#8 x 3/4")Service part / kit
98-5822Bushing, Reducer - Flush (1/2 NPT x 3/8 NPT)Service part / kit
98-6108-03Decal - Model IdentificationService part / kit
98-6111-03ONAN GEN SET CUMMINS GEN SETService part / kit
98-6139-03CUMMINS ONAN GEN SETService part / kit
98-6169Terminal Assembly (Includes Replaceable Items 26 thru 29)Service part / kit
F-2375A single line drawing of the prime power systemService part / kit
M-3804747Piston KitService part / kit
68445PIN, GROOVEPin
3628605PLUG, PIPEPipe plug
3628607PLUG, PIPEPipe plug
3178464PLATE, COVERPlate cover
121-0111Drive, PumpPump
159-1451Pump, Fuel TransferPump
3011076SEAL, D RINGSeal
3014668SEAL, D RINGSeal
3081489SEAL, OILSeal
3177556SEAL, RECTANGULAR RINGSeal
508-0292Washer, Sealing - CopperSeal
509-0283-01SealSeal
509-0336Seal, O-RingSeal
509-0337Seal, O-RingSeal
193-0244Sender, Pressure - 0i1Sensor
193-0375# Sender, Water TemperatureSensor
309-0269Sender, Temperature-Lo EngineSensor
960-0181Service manualService manual
960-0302Service manualService manual
960-0504PCC Control Service ManualService manual
960-0507Detector Control Service ManualService manual
3033853SHAFT, IDLERShaft idler
3175281SHAFT, IDLERShaft idler
205741SHIM, A/R .007 Inch O/SShim
205742SHIM, A/R .008 Inch O/SShim
205743SHIM, A/R .009 Inch O/SShim
205744SHIM, A/R .020 Inch O/SShim
205745SHIM, A/R .031 Inch O/SShim
149-2232Starter - 24 VDCStarter
3000138SUPPORT, BEARINGSupport bearing
309-0649Thermostat (Includes Connector Socket) (S11)Thermostat
3000139BEARING, THRUSTThrust bearing
3001708BEARING, THRUST A/R .010 Inch O/SThrust bearing
3001709BEARING, THRUST A/R .020 Inch O/SThrust bearing
3001710BEARING, THRUST A/R .030 Inch O/SThrust bearing
3001711BEARING, THRUST A/R .040 Inch O/SThrust bearing
3179664VALVE, PISTON COOLINGValve piston cooling

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

Which generators use the Cummins/Onan KTA50-G11 engine?

The Cummins/Onan KTA50-G11 powers 1 generator set(s), including Cummins/Onan 1250DFLC.

What is a common problem with the Cummins/Onan KTA50-G11 engine?

A commonly reported issue on generators using the Cummins/Onan KTA50-G11 is: Over Current.