MTD 133-502A Specifications

TecumsehQuick ReferenceService InformationCovers Engine and Transmission ProductForm No.695933 R 7/00

91Tecumseh 2 Cycle Diaphragm AdjustmentsNOTE: For meeting emission requirements, somecarburetors have fixed-main or idle jets. Theabsence of the adju

10TC Series Governor Adjustment1. AIR VANE2. BACKLASH SPRING3. GOVERNOR LINK4. GOVERNOR SPRING5. MOUNTING SCREW6. SPEED ADJUSTMENT SCREW7. SPEED CONTR

11IDLE MIXTURESCREWIDLE SPEED ADJUSTMENTSCREW4Carburetor Pre-Set and AdjustmentBoth the Walbro and the Tillotson carburetors usedon TC engines have no

122-Cycle Engine Speed and Mixture Adjustments: TVS/TVXL840Rotate sleeve clockwise to increase R.P.M., counterclockwise to decrease R.P.M.NOTE: The s

13HORIZONTAL FIXED SPEED15VERTICAL ENGINEFIXED SPEED-REMOTE CONTROLVERTICAL ENGINEVARIABLE SPEED-REMOTE CONTROLHORIZONTAL FIXED SPEED(ALUMINUM AIR VAN

14Static Governor AdjustmentsThe purpose of making a static governor adjustmentis to remove all free-play between the governorspool and the carburetor

15* As of August 1992, all small frame engines, including VLV40-6.75, usea retainerless shaft. Service replacement shafts will be retainerlessfor all

16SHAFTWASHERBRACKETSPOOLRETAININGRINGGEARASSY.(GOV)SCREWSROD ASSY.(GOV.)SPOOLWASHERRETAININGRINGGEAR ASSY.(GOV.)WASHERSPACERSHAFTSPOOLWASHERRETAINING

17MAIN MIXTURESCREW1718** NON-ADJUSTABLENO CHOKEPRIMER* ADJUSTABLEMIXTURES, CHOKESMALL WIRE (DRILL BIT)HOLE IN BRACKETHOLE IN SPEEDCONTROL CHOKEACTUAT

18HIGH SPEEDADJUSTMENTSCREWLOW SPEEDADJUSTMENT SCREWIDLEMIXTURESCREWMAIN MIXTURE SCREWCOUNTERCLOCKWISETO INCREASE SPEEDCLOCKWISE TODECREASE SPEEDSPEED

1IntroductionThis booklet contains the quick reference and basic trouble-shooting information previously found on Tecumseh wall chartsand in the Techn

19TNT 100 VERTICAL ENGINES2526BEND CONTROLBRACKET TO SETRPMVERTICAL ENGINESTVS 115 ENGINE WITH DUALSYSTEM CARBURETORBEND TO INCREASE SPEEDBE

20BEND TO INCREASE SPEEDBEND TO DECREASE SPEEDLONG BENDSHORT BENDGOVERNOR SPRINGTWIST COUNTERCLOCKWISETO DISCONNECT30VLV Governor an

21MAIN MIXTURESCREWMAIN MIXTURESCREW323334SMALL PIECE OF WIREHOLE IN CONTROL BRACKETMOUNTINGBOLTSHOLE INCHOKEACTUATINGLEVERHOLE IN CHOKE LEVERHIGH SPE

22BEND TO INCREASE SPEEDBEND TO DECREASE SPEEDTo adjust high speed on an up/down control (diag.35)bend the adjustment tab. Low speed is adj

23Engine Speed and Mixture Adjustments - continuedOVM/OVXL,TVM 170, 195 & 220Governor Override System for TVM170, 195 and 220 Engines (diag. 41)Th

24SMALL FRAME GOVERNED IDLEHORIZONTAL MEDIUM FRAMECONSTANT SPEED APPLICATIONSLIGHTWEIGHT R.V. TYPE44454647HORIZONTAL MEDIUM FRAMEIDLE SPEEDCRACK SCREW

25INCREASE DECREASEHorizontal Shaft Engines - continued53OHH RV CONTROLGOVERNOR SPRINGGOVERNED IDLE LINK51OHH REMOTE & MANUAL49

265556Governor Adjustment for Horizontal EnginesMove the remote controls to the RUNposition.Loosen Screw "A".Pivot plate "B" count

27Low Oil Shutdown SwitchesCheck the LOS switch while it is in the engine. Theengine must be level, and the oil level at the fullmark. Place the spe

28Low Oil SensorThis sensor must use a #194 bulb, resistance of thebulb MUST be .27 ampere in series with the sensorfor proper operation and to preven

2TVSTVXLHSKHXLTC200TC300AV520/600TVS600AH/HSK600AH520TCH200/300Note: Torque specifications listed should not be confused with the torque value observ

29WiringCONDITION. All wiring must be fully insulated between connection points, securely fastened and free offoreign material (such as rust and corr

306465GROUNDED SOLENOIDSTART POSITIONCIRCUIT CLOSEDRUNNING ANDSTOP POSITIONINSULATED SOLENOIDSTART POSITIONCIRCUIT CLOSEDRUNNING AND STOPPOSITION CIRC

31Key SwitchesSwitches are the common point on the vehicle where most of the wiring centrally comes together. Thereare many varieties of switches ava

32Continuity w / keyin start positionContinuity w / keyin off positionNO Continuity inany key positionContinuity w / keyin run positionContinuity w /

333549361111134960349903 Amp A.C.6109813 Amp A.C.611095ENGINEALTERNATORSHAFTCENTERINGTUBERECOILSTARTERADD-ONALTERNATORSELF-TAPPINGSCREWSA.C.CONNECTORD

342 and 3 Amp D.C.611116 (3 Amp)3 Amp D.C. - 5 Amp A.C.7 Amp D.C.610818* Uses regulator/rectifier 6107497 Amp D.C.3 Amp D.C.6111135 Amp D.C.* Uses reg

35* Uses regulator/rectifier 61074910 Amp Alternator20 Amp Alternator* Uses regulator/rectifier 610996 or 610907A; depending on specnumber an open cir

36Testing ProceduresD.C. Charging AdaptorRectifier Bridge Check With Ohmmeter for D.C.AdaptorContinuity should exist during one of the two followingte

37BATTERY GROUND (BLACK)ELECTRIC STARTERLEAD (ORANGE)BLACKRED(-) ENGINE GROUND(+) POSITIVE LEADMAGNETO GROUND(GREEN)D.C. OUTPUTLEAD (RED)67YELLOW#4414

3835 Watt A.C.Before making any exterior tests, check for aninoperative switch, shorted wires and burned outheadlight and/or stop tail light. To chec

3NOTE: Refer to Technician's Handbook for a moredetailed list of remedies.*Carburetor Troubleshooting use Technician'sHandbook or Carbureto

392.5 Amp D.C., 35 Watt LightingIf output is below standard listed, pull back protectivecoating in front of the diode and check A.C. output.If A.C. is

40If less than the above readings, proceed in making an A.C. output check by pulling back the protectivecoating from the fuse holder and diode. Using

41Minimum values should read:2500 R.P.M. - 24.0 Volts A.C.3000 R.P.M. - 29.0 Volts A.C.3300 R.P.M. - 32.0 Volts A.C.3600 R.P.M. - 35.0 Volts A.C.If le

42MODELS OVM/OVXL/OHV3 Amp D.C. (Red wire)2500 R.P.M. - 8.0 Volts D.C.3000 R.P.M. - 11.0 Volts D.C.3600 R.P.M. - 13.0 Volts D.C.5 Amp A.C. (Yellow wir

4381YellowRedDIODEA.C.DIODERedD.C.D.C.82YellowModels OVM/OVXL/OHV(Read between Engine and Diode, diag. 81 &82)With the engine running the minimum

44All ModelsWith the engine running the minimum values shouldread:2500 R.P.M. - 20.0 Volts A.C.3000 R.P.M. - 25.0 Volts A.C.3300 R.P.M. - 26.5 Volts A

455 Amp Alternator System Regulator-Rectifier Under Blower HousingCHECKING THE SYSTEM: An open circuit D.C.voltage check cannot be made with this sys

46Check for a defective ammeter, wiring, etc. If lessthan the above readings, disconnect the plug fromthe regulator-rectifier, and insert the A.C. vol

4710 Amp A.C. AlternatorCHECKING THE SYSTEM: Unplug the connectorat the wiring harness supplied by the OEM. Proceedto make an A.C. output check. Pl

4816 Amp Alternator System with External RegulatorD.C. OUTPUT - REDSOLENOIDGREENLIGHTSWITCHAMMETERMAGNETOGROUNDBATTERYREGULATEDD.C. OUTPUTFUSEYELLOWRE

4NOTE: Refer to Technician's Handbook for a more detailed list of remedies.Two Cycle Troubleshooting - continuedIGNITION SYSTEMEngine WillNot St

49D.C. Output(2) HeadlightsSwitchA.C. Output LeadYellowD.C. OutputLead RedA.C. OutputView A-AKey SwitchAmmeterBatteryMagneto GroundStarting MotorSolen

50Typical Wiring Circuits - continued7 AMP ALTERNATOR SYSTEMSEXTERNAL REGULATOR-RECTIFIER5 Amp Alternator SystemAASwitchLight, etc.D.C (+)FuseMSBRAKey

51Typical Wiring Circuits - continuedD.C. Output -RedGreenFuseRegulatedD.C. OutputMagnetoGroundBatteryAmmeterBRSMA(+)SwitchLight(+)Solenoid16 AMP ALTE

52Typical Wiring Circuits - continued20 AMP ALTERNATOR SYSTEMSYellowGreenMagneto Ground (Green)A.C. Output (Yellow)AAMagnetoGroundLight, etc.Solenoid(

53Identification Number LocationsEarly Models were not identified with a model number on the unit. THE MODEL NUMBER WILL BE FOUND O

54205 - 027C8194A0048The recent warranty audit referenced in bulletin number “123” suggested we review the way our newTecumseh/Peerless® models are id

55Transaxle Troubleshooting95969798In-Line Shift Models (i.e. 800, 820, 915, 920, 930 MST)Transaxle troubleshooting can be a mystery to many technicia

56Hard Shifting Transaxles and Drive BeltsOften hard shifting is blamed on an internal problem in the transaxle.To determine if the problem is transax

57VST TroubleshootingThe information on this page has been provided to help understand the internal operation of the VST. Donot use this information

58TORQUE VALUEMODELSPART AFFECTED IN-LBS FT-LBS NmBolt 5/16-18 (Housing) 100 Series 228-264 19-22 25.8 - 29.9Nut 5/16-18 (Drive Gear) 100 Series 120-1

5TVM & TVXL170-195-220Torque SpecificationsFOUR-CYCLE LIGHT FRAME ENGINE SERIES(TVS, TNT, ECV, LAV, LEV, H, HS, OHH, OVRM and VLV)Location Inch lb

59RIGHT ANGLEAND T DRIVESModelNo. QuantityAll ModelsExcept * 4 oz./118 ml Grease*1408-P91*1409-P91*1410-P91*3002 3 oz./89 ml Grease*3003*3028*3029*303

60EUROPA MODELS *VERTICALS VERTICALS (CONT.)oz. ml oz. mlVantage 21 630 Centura 21 630Prisma 21 630 HTL 21 630Synergy 21 630 BVS 21 630Synergy "5

61TECUMSEH 2-CYCLE ENGINE OIL REQUIREMENTS2-CYCLEENGINE OILPART NO. 730227TECUMSEH 2-CYCLE ENGINEOIL may be used in a variety of2 cycle engines includ

62J17LMAV85/125AV520/600MV100SService Number34046RL86C† OHM120‡ OHSK110-130 OVM120Note:*OVXL models with specification nos.202700, 203000 and up, us

63Head Bolt Torque SequenceLEV, TVS75-120, H, HSK30-70, HS, HSSK40-50,V50-70, TVXL105-115, TVM125-140Torque bolts in 50 in. lb. (5.5 Nm) increments.TV

64Valve ClearanceValve Clearance (Cold) * ±.002 (.05 mm)Engine Model Intake Valve Exhaust ValveLAV35,50 .006" .006"LEV80-120 (.004"

65Recoil Quick Reference PartsDuring the past few years we have introduced you to several new styles of recoil assemblies. These recoilsare used on a

66Tecumseh Flywheel Key Quick ReferenceIdentification ChartKeys are drawn to full scale.29410009Steel32589Steel611191Steel8446Steel650455Steel611054St

67Primer Bulb IdentificationCaution must be used when replacing carburetor primer bulbs. Using the wrong primer bulb could causehard starting and ope

68Piston Ring InstallationPiston ring orientation: Compression rings may have either an inside chamfer or an outside notch. Insidechamfers always face

6Torque Specifications - continuedHHVHOHLocation Inch lbs. Nm Engine DesignationTorqueTVTFOUR-CYCLE LARGE FRAME ENGINE SERIES (CAST IRON BLOCK HH, VH

69Quick Reference for DipsticksNOTE: OBS abbreviation stands for obsoleteSCREW-IN DIPSTICKFEMALE THR’D, PLASTIC TUBESERVICE NO. ID NO.35507 10435556

704 Cycle Quick Reference - Model Letter DesignationECH - Exclusive Craftsman HorizontalECV - Exclusive Craftsman VerticalH - Horizontal ShaftHH - Hor

71VERTICAL 4-CYCLE ENGINES10000 - TNT10012000 - TNT12020000 - LAV25, OVRM5520500 - OVRM10521000 - OVRM6021800 - OVRM6022000 - OVRM6530000 - LAV3033000

72Symbol When You Know Multiply By To Find SymbolLENGTH mm millimeters 0.04 inches in.cm centimeters 0.4 inches in.m meters 3.3 feet ft.m meters 1.1 y

7Four Cycle TroubleshootingAs an aid in troubleshooting any piece of equipment, interview the customer, and reviewconditions and symptoms of problem.

8Four Cycle Troubleshooting - continuedNOTE: Refer to Technician's Handbook for a more detailed list of remedies.IGNITION SYSTEMEngine WillNot S