Tecumseh Quick Reference Service Information Covers Engine and Transmission Product Form No.
Introduction This booklet contains the quick reference and basic troubleshooting information previously found on Tecumseh wall charts and in the Technician's Handbooks. This booklet is designed to be used as a work bench quick reference guide when servicing Tecumseh engines and motion drive systems. Technician's Note: Tecumseh engines are manufactured to meet EPA and CARB standards.
Note: Torque specifications listed should not be confused with the torque value observed on engines which have been run. The Torque specifications take relaxation into account so sufficient clamping force exists after an engine has reached operating temperature. Torques listed are intended to cover highly critical areas. More extensive torques are found in the respective repair manual. Torque Specifications TWO-CYCLE ENGINE SERIES 840 - 850 TWO-CYCLE ENGINE SERIES 120-204 360-420 160-220 13.5-23 41-47.
Two Cycle Troubleshooting As an aid in troubleshooting any piece of equipment, interview the customer, and review conditions and symptoms of the problem. Examine exterior for clues: leaks, excessive dirt, damaged or new parts.
Two Cycle Troubleshooting - continued IGNITION SYSTEM Engine Will Not Start Check for spark No Spark Spark Check flywheel for correct key, damaged key or key adaptor Replace spark plug Isolate engine from all equipment (disconnect wiring harness), repeat test Set proper air gap on external coil Set proper point gap, check condensor and timing (if equipped) Test coil for intermittent or weak spark Check electric starter if applicable Spark Equipment problem, check switches, wiring and equipment con
Note: Torque specifications listed should not be confused with the torque value observed on engines which have been run. The Torque specifications take relaxation into account so sufficient clamping force exists after an engine has reached operating temperature. Torques listed are intended to cover highly critical areas. More extensive torques are found in the respective repair manual.
Torque Specifications - continued FOUR-CYCLE LARGE FRAME ENGINE SERIES (CAST IRON BLOCK HH, VH and OH) Connecting Rod 86-110 10-12.5 Cylinder Head 180-240 20.5-27 Mounting Flange & Cylinder Cover 100-130 11-14.5 Rocker Arm Shaft to Box 180-220 20.5-25 Rocker Arm Box to Cylinder Head 80-90 9-10 Flywheel Nut 600-660 68-74.5 Engine Designation OH Nm VH Inch lbs. Torque HH Location • • • • • • • • • • • • • • FOUR-CYCLE HEAVY FRAME ENGINE SERIES (V-TWIN) Inch lbs.
Four Cycle Troubleshooting As an aid in troubleshooting any piece of equipment, interview the customer, and review conditions and symptoms of problem. Examine exterior for clues: leaks, excessive dirt, damaged or new parts.
Four Cycle Troubleshooting - continued IGNITION SYSTEM Engine Will Not Start Check for spark No Spark Spark Check flywheel for correct key, damaged or sheared key Replace spark plug Set proper air gap on external coil Isolate engine from all equipment (disconnect wiring harness), repeat test Set proper point gap, check condensor and timing Test coil for intermittent or weak spark Spark Equipment problem, check switches, wiring and equipment controls Engine problem, check for shorts or grounds in
Tecumseh 2 Cycle Diaphragm Adjustments NOTE: For meeting emission requirements, some carburetors have fixed-main or idle jets. The absence of the adjustment screw indicates fixed jets and no adjustment is necessary. Diaphragm-Dual Adjustment. Turn mixture adjusting screws in finger tight to the closed position, then one (1) turn out from closed position. This setting is approximate. This will allow the engine to be started so the carburetor can be fine tuned.
TC Series Governor Adjustment Three different styles of governor systems are used on TC engines. Use the following illustrations (diags. 2 and 3) to identify the governor system used and the following procedure to adjust the governed engine speed. 1. Allow the engine to run for at least 5 minutes to reach operating temperature. Make sure the air filter (if equipped) is clean and the choke is in the off position. 2. Using a Vibratach (part# 670156) or other tachometer, determine the engine's R.P.M.
Walbro (WTA, WT) and Tillotson (HU) Diaphragm Adjustment Carburetor Pre-Set and Adjustment Both the Walbro and the Tillotson carburetors used on TC engines have non-adjustable main mixture jets. Only the idle mixture is adjustable by turning the idle mixture screw. Use the following procedure to pre-set the idle mixture screw. Turn the idle mixture screw (clockwise) finger tight to the closed position, then turn the screw counterclockwise to obtain the proper preset (diag. 4).
2-Cycle Engine Speed and Mixture Adjustments: TVS/TVXL840 IDLE SPEED ADJUSTMENT HIGH SPEED ADJUSTMENT 5 Linkage Location To aid in the proper reassembly of the governor linkage, mark the linkage locations. HOLDING SCREW STATIC GOVERNOR ADJUSTMENT SCREW 6 Static Governor Adjustment To adjust the static governor, loosen the holding screw, rotate the governor arm and slotted shaft in the direction that will open the throttle to the wide open position, and then re-tighten the holding screw.
Governors and Linkage for Air Vane - continued ADJUST RPM BY LOOSENING SCREW AND SLIDING BRACKET IN DE CR CR EA EA SE SE IDLE RPM ADJUSTMENT IDLE MIXTURE HORIZONTAL FIXED SPEED (ALUMINUM AIR VANE GOVERNOR) ADJUST RPM BY LOOSENING SCREW AND SLIDING BRACKET 11 HIGH SPEED RPM ADJUSTMENT THIS HOLE NOT PRESENT ON ALL MODELS SPRING VERTICAL ENGINE VARIABLE SPEED-REMOTE CONTROL 12 SPRING GOVERNOR LINK IN DE CR CR EA EA SE SE IDLE RPM ADJUSTMENT HIGH SPEED RPM ADJUSTMENT IDLE MIXTURE THIS HOLE NOT P
Static Governor Adjustments The purpose of making a static governor adjustment is to remove all free-play between the governor spool and the carburetor (see illustration). Any freeplay here will result in hunting/surging or erratic running. After completing this procedure, always re-check the engine speeds using the steps outlined in the following pages. SPRING CHOKE THROTTLE GOVERNOR ROD NO FREE PLAY To set the static governor, do the following: 1. Be sure the engine is stopped or damage may occur. 2.
Small Frame, Vertical and Horizontal* Models: LAV35,40,50 - H25,30,35 - HS40,50 - HSK - HSSK TNT100,120 - ECH90 - TVS75,90,105,115,120 - OVRM ALL - ECV100,105,110,120 Retainerless Governor System for Small Frames* RETAINING RING SPOOL SPOOL UPSET ROLLED RETAINING RING SHAFT GEAR ASSY. (GOV.) WASHER GEAR ASSY. (GOV.) WASHER SHAFT NOTE: Gear assembly must have .010 - .020 (.25 - .50 mm) end play after shaft is installed into flange. * As of August 1992, all small frame engines, including VLV40-6.
OHM120 - OHSK 80-130 Medium Frame Horizontal Models: HH60,70 - H50,60,70 - HM70,80,100 HMSK SPOOL SHAFT WASHER RETAINING RING ROD ASSY. (GOV.) GEAR ASSY. (GOV.) SPOOL WASHER WASHER RETAINING RING SPACER GEAR ASSY. (GOV) BRACKET SHAFT SCREWS OVM120, OVXL120, 125 - OHV11-17 OH120, 140, 160, 180 SPOOL SPOOL WASHER RETAINING RING WASHER GEAR ASSY. (GOV.) WASHER SPACER NOTE; SPACER MAY BE PART OF THE GEAR ASSEMBLY. GEAR & SHAFT ASSY. (GOV.) SHAFT NOTE: On models OHV13.
Engine Speed and Mixture Adjustments 3-5 H.P. Vertical Shaft Engines NOTE: Starting and operating problems may exist when engines are used at high elevations (over 4,000 feet above sea level). In cases where a fixed main carburetor is used, refer to Bulletin 110 for correction. Engines which are identified as compliant with CARB (California Air Resources Board) or EPA (US Environmental Protection Agency) regulations can NOT be changed from their factory jetting unless specifically authorized.
Engine Speed and Mixture Adjustments - continued 3-5 H.P. Vertical Shaft Engines HIGH SPEED ADJUSTMENT SCREW LOW SPEED ADJUSTMENT SCREW SPEED CONTROL MOUNTING BOLTS COUNTERCLOCKWISE TO INCREASE SPEED CLOCKWISE TO DECREASE SPEED IDLE MIXTURE SCREW 20 MAIN MIXTURE SCREW The second is on a bracket located between the blower housing and the speed control (diag. 20). Low speed is adjusted by the throttle crack screw on the carburetor (diag. 19 and 20).
Engine Speed and Mixture Adjustments - continued 3-5 H.P. Vertical Shaft Engines LOW SPEED TAB BEND HIGH SPEED TAB BEND TO INCREASE SPEED TO DECREASE SPEED HIGH SPEED PIN POSITION BEND CONTROL BRACKET TO SET RPM DECREASE TOOL (670326) INCREASE SNAP IN CONTROL VERTICAL ENGINES 24 25 GOVERNED / NON-GOVERNED IDLE With the engine running at its lowest speed, set the governed idle at the designated R.P.M. by bending the idle R.P.M. tab.
VLV Governor and Linkage Governor Adjustment With the engine stopped, loosen the screw holding the governor clamp and lever. Turn the clamp clockwise, then push the governor lever (connected to the throttle) to a full wide open throttle position. Hold the lever and clamp in this position and tighten the screw. TWIST COUNTERCLOCKWISE TO DISCONNECT GOVERNOR SPRING Linkage Installation The solid link is always connected from the throttle lever on the carburetor to the lower hole on the governor lever.
Engine Speed and Mixture Adjustments 5-15 HP Vertical Shaft Engines SMALL PIECE OF WIRE HOLE IN CONTROL BRACKET The first step is adjusting the speed control bracket for full choke operation. Loosen the two speed control bracket mounting bolts and move the control lever to the full high speed/full choke position. Insert a piece of wire through the hole in the speed control bracket, the choke actuating lever, and the choke lever (diag. 32).
Engine Speed and Mixture Adjustments - continued 2.5-17.5 HP Vertical Shaft Engines To adjust high speed on an up/down control (diag.35) bend the adjustment tab. Low speed is adjusted by a screw at the bottom of the control bracket. Both the governor override system and the up/down speed control have a governed idle. On these systems it is important to also adjust the throttle crack screw.
Engine Speed and Mixture Adjustments - continued LOW SPEED TAB HIGH SPEED PIN POSITION HIGH SPEED TAB NOTE: ON REMOTE CONTROL THIS WILL NOT BE PRESENT HIGH SPEED ADJUST LOW SPEED ADJUST DECREASE INCREASE OVRM SNAP IN CONTROL 37 OVRM 38 OVRM 39 STANDARD TVM ENGINE WITHOUT GOVERNOR OVERRIDE 40 SPEED CHANGES APPROXIMATELY 200 RPM PER SLOT MAIN MIXTURE SCREW GOVERNOR ADJUSTING SCREW (LOW SPEED) HIGH SPEED OVM/OVXL,TVM 170, 195 & 220 41 OHV 11-17 Governor Override System for TVM170, 195 and 22
Engine Speed and Mixture Adjustments Horizontal Shaft Engines IDLE SPEED CRACK SCREW IDLE SPEED CRACK SCREW HIGH SPEED RPM ADJUSTMENT SCREW HORIZONTAL LIGHTWEIGHT HIGH SPEED RPM ADJUSTMENT SCREW LIGHTWEIGHT R.V.
Horizontal Shaft Engines - continued IDLE SPEED CRACK SCREW HIGH SPEED RPM ADJUSTMENT SCREW 48 MEDIUM FRAME 49 HM80-100 SERIES WINTER APPLICATION CONTROL GOVERNED IDLE LINK AND ADJUSTMENT HIGH SPEED ADJUSTMENT HIGH SPEED ADJUST BEND TO ADJUST SPEED DECREASE INCREASE 50 OHH REMOTE & MANUAL OHH FIXED SPEED 51 T-10 (TORX) THROTTLE CRACK SCREW GOVERNED HIGH SPEED ADJUST BEND INCREASE GOVERNOR SPRING GOVERNED IDLE LINK OHH RV CONTROL 52 CORRECT BUSHING INSTALLATION DEEP SIDE HERE DECREASE
Engine Speed Adjustments - 8-18 HP, Cast Iron Governor Adjustment for Horizontal Engines Move the remote controls to the RUN position. Loosen Screw "A". Pivot plate "B" counterclockwise and hold. Move lever "C" to left. Tighten screw "A" securely. VARIABLE SPEED "C" PIVOT POINT GOVERNOR SPRING "A" "B" MOVE TO "RUN" POSITION TURN CCW When the governor is properly set the carburetor throttle lever will be in a wide open position when the controls are set for starting.
Switches, Sensors, and Solenoids Low Oil Shutdown Switches Check the LOS switch while it is in the engine. The engine must be level, and the oil level at the full mark. Place the speed control in the run position. Remove the spark plug wire from the spark plug. Install a gap type tester connected to the spark plug wire and a good engine ground. Spin the engine over using the electric or recoil starter. A bright blue spark should be seen at the tester.
Switches, Sensors, and Solenoids - continued Low Oil Sensor This sensor must use a #194 bulb, resistance of the bulb MUST be .27 ampere in series with the sensor for proper operation and to prevent sensor damage. Remove the sensor from the engine and attach the electrical plug. Attach a jumper lead from an engine ground to the threaded portion of the sensor. Place the keyswitch in the run position.
Wiring CONDITION. All wiring must be fully insulated between connection points, securely fastened and free of foreign material (such as rust and corrosion) at the connection points. This is especially important in the use of batteries where much of the potential may be lost due to loose connections or corrosion. Remember to check the insulation on the wire. All it takes is a pin hole for a wire to "ground out" on the engine or frame. This is of special concern when moisture or water is present.
Diodes In order to charge a battery it is necessary to convert alternating current (A.C.) to direct current (D.C.) This is accomplished by using a diode or rectifier. Using a single diode will make use of one half of the A.C. signal and is known as HALF WAVE RECTIFICATION. This is acceptable in certain applications. In certain situations it is necessary to make use of the entire A.C. signal. To accomplish this we use multiple diodes in a bridge configuration which produces FULL WAVE RECTIFICATION.
Key Switches Switches are the common point on the vehicle where most of the wiring centrally comes together. There are many varieties of switches available. Replace damaged or failed switches according to the equipment manufacturer's specifications. NEVER substitute an automotive switch for a switch replacement on a small engine application, or a switch from an engine with a battery ignition. The more common switches are shown below: A. B. C. E. F.
Continuity Check for Switches Switch A Connect Ohmmeter Leads to: S&G X M&G M&S Switch B (metal case) Connect Ohmmeter Leads to: S&G S&B X S & A, S & metal case M&B M & A, M & metal case B&A B & metal case A & metal case with 5th terminal R & S, R & M R & B, R & A R & metal case Switch C Connect Ohmmeter Leads to: A&S A & M, A & G (3) A & R, A & B S & M, S & R, S & G (3) S&B X M & R, M & B M & G (3) R & G (3) R&B B & G (3) 32 Con in s tinuity tart pos w / key ition Con in o tinuity ff po w sitio / key n
1 AMP (18 WATT) A.C. - ADD-ON ALTERNATOR 350 Milliamp 611077 (Alternator Only) Red ENGINE CENTERING TUBE RECOIL STARTER ADD-ON ALTERNATOR 34960 34990 Red Black ALTERNATOR SHAFT A.C. CONNECTOR D.C. CONNECTOR Yellow Red 35493 SELF-TAPPING SCREWS Brown 3 Amp A.C. 18 Watt A.C. Lighting Yellow wire under sleeve Green Black Red 611111 610981 3 Amp D.C. 3 Amp A.C. Green Red Green Yellow Yellow Green Red 610968 Yellow - Alternator A.C. Leads Red - Alternator D.C.
Charging System Charging System - continued 3 Amp D.C. 2 and 3 Amp D.C. Green Green Red Diode 3 Amp Red Diode Red 2 Amp 611116 (3 Amp) 611113 (requires optional flywheel) 3 Amp D.C. - 5 Amp A.C. 5 Amp D.C. Yellow Red Yellow Red Yellow Diode Red Yellow 611176 611104 * Uses regulator / rectifier 611175A 7 Amp D.C. 7 Amp D.C. Yellow Red Green Green Yellow Red Yellow 610818 610975 * Uses regulator/rectifier 610749 * Uses regulator / rectifier 610938 Yellow - Alternator A.C.
Charging System - continued 7 Amp D.C. 7 Amp D.C. 611097 611256 Red Yellow Yellow Green Green Green Yellow Yellow Red Red Green Red Yellow Yellow * Uses regulator/rectifier 611098; an open circuit D.C. voltage check cannot be made. 10 Amp Alternator 10 Amp D.C. 611159 610761 Green Green Yellow Yellow Green Yellow Yellow Black * Uses regulator/rectifier 610749 20 Amp Alternator 12 Amp D.C.
CAUTION: When testing Alternator/Charging System: DO NOT disconnect positive lead(s) from the battery while the engine is running. With the engine stopped, disconnect lead(s), then perform test and stop engine before re-connecting. Connecting or disconnecting while the engine is running will send a voltage surge through the regulator, causing damage. Testing Procedures Black D.C. Charging Adaptor Rectifier Bridge Check With Ohmmeter for D.C.
350 Milliamp Charging System (+) POSITIVE LEAD CHECKING THE SYSTEM: The battery must be in the circuit to perform the test properly. Set the voltmeter to the 0-20 D.C. volt scale. Connect a voltmeter across the battery. The voltmeter should read battery voltage. Start the engine. With the engine running, there should be an increase in the voltage reading. If there is no change in the voltage reading, the alternator is defective and should be replaced (diag. 67).
35 Watt A.C. Before making any exterior tests, check for an inoperative switch, shorted wires and burned out headlight and/or stop tail light. To check out the alternator, check the A.C. lead to ground at each yellow wire (diag. 69). With engine running, minimum values should read: 2500 R.P.M. - 8.0 Volts A.C. 3000 R.P.M. - 9.5 Volts A.C. 3300 R.P.M. - 10.5 Volts A.C. 3600 R.P.M. - 11.5 Volts A.C. A.C. YELLOW GREEN IGNITION STOP If the above minimum readings are noted, the alternator is okay.
2.5 Amp D.C., 35 Watt Lighting If output is below standard listed, pull back protective coating in front of the diode and check A.C. output. If A.C. is good check each diode it services as required (diag. 71). RED D.C. value (+) or (-); check both sides of A.C. outputs. R.P.M. D.C. Volts 2500 - 8.0 Volts D.C. 3000 - 9.5 Volts D.C. 3300 - 10.5 Volts D.C. 3600 - 11.5 Volts D.C. D.C. TWO DIODES D.C. NEGATIVE OUTPUT LEAD (BROWN D.C.) R.P.M. Volts A.C. 2500 - 18 Volts A.C. 3000 - 22 Volts A.C.
If less than the above readings, proceed in making an A.C. output check by pulling back the protective coating from the fuse holder and diode. Using an A.C. voltmeter, check voltage from a point between the engine and the diode as shown in the diagram (diag. 73). With the engine running the minimum values should read: 2500 R.P.M. - 18.0 Volts A.C. 3000 R.P.M. - 22.0 Volts A.C. 3300 R.P.M. - 24.0 Volts A.C. 3600 R.P.M. - 26.0 Volts A.C. If low or no voltage is experienced, replace the alternator.
Minimum 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. RECTIFIER PANEL A.C. MOUNTED ON VOLTMETER ENGINE If less than above output, generating coil assembly is defective. NOTE: If there is no regulator in this system. The total output of the two diodes is three (3) AMPS. If the battery is overcharging (boiling and bubbling), reduce the D.C. input by one-half by removing one of the diodes. FUSE 76 3 Amp D.C.
MODELS OVM/OVXL/OHV 3 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 wire) 2500 R.P.M. - 8.5 Volts A.C. 3000 R.P.M. - 11.0 Volts A.C. 3600 R.P.M. - 13.0 Volts A.C. Red DIODE Yellow MODELS OHV 13.5 - 17.0 (3/5 Amp split) 3 Amp D.C. (Red wire) 2500 R.P.M. - 6.5 Volts D.C. 3000 R.P.M. - 9.0 Volts D.C. 3600 R.P.M. - 11.0 Volts D.C. D.C. D.C. 75 5 Amp A.C. (Yellow wire) 2500 R.P.M. - 15.0 Volts A.C. 3000 R.P.M. - 18.0 Volts A.
Models OVM/OVXL/OHV (Read between Engine and Diode, diag. 81 & 82) With the engine running the minimum values should read: 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.C. 3600 R.P.M. - 29.0 Volts A.C. A.C. Red DIODE Models OHV13.5-17.0 (Read between Engine and Diode) 2500 R.P.M. - 17.0 Volts A.C. 3000 R.P.M. - 21.0 Volts A.C. 3600 R.P.M. - 24.5 Volts A.C. If low or no voltage is experienced, replace the alternator. If the alternator puts out the minimum A.C.
All Models With the engine running the minimum values should read: 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.C. 3600 R.P.M. - 29.0 Volts A.C. DIODE If low or no voltage is experienced, replace the alternator. If the alternator puts out the minimum A.C. voltage, replace the diode. Red Yellow A.C. A.C. 83 3 Amp A.C.
5 Amp Alternator System Regulator-Rectifier Under Blower Housing CHECKING THE SYSTEM: An open circuit D.C. voltage check cannot be made with this system. If a known good battery fails to maintain a charge, proceed in making an A.C. voltage test. To do this, the blower housing must be removed, and the regulator-rectifier must be brought outside of the blower housing. YELLOW RED NOTE: D.C. OUTPUT MUST BE DISCONNECTED TO PERFORM A.C. OUTPUT TEST. Disconnect the red D.C.
Check for a defective ammeter, wiring, etc. If less than the above readings, disconnect the plug from the regulator-rectifier, and insert the A.C. voltmeter probes in the two outside terminals (diag. 87). A.C. With the engine running the minimum values should read: 2500 R.P.M. - 12.0 Volts A.C. 3000 R.P.M. - 14.0 Volts A.C. 3600 R.P.M. - 18.0 Volts A.C. If the minimum readings are noted, the regulatorrectifier is defective. If less than the above readings, the alternator is defective.
10 Amp A.C. Alternator CHECKING THE SYSTEM: Unplug the connector at the wiring harness supplied by the OEM. Proceed to make an A.C. output check. Place one lead of the A.C. voltmeter into the center of the connector. Place the other lead to engine ground (diag. 90). With the engine running the minimum values should read: 2500 R.P.M. - 16.0 Volts A.C. 3000 R.P.M. - 20.0 Volts A.C. 3300 R.P.M. - 22.0 Volts A.C. If less than above output, the alternator assembly is defective. A.C. OUTPUT YELLOW A.C.
16 Amp Alternator System with External Regulator CHECKING THE SYSTEM: An open circuit D.C. voltage check cannot be made with this system. If a known good battery fails to maintain a charge, proceed in making an A.C. voltage test. D.C. OUTPUT - RED SOLENOID Disconnect the red D.C. output connector at the wire harness and connect the probes from an A.C. voltmeter to the wire terminals at the regulatorrectifier (diag. 93).
Typical Wiring Circuits 3 Amp D.C. / 5 Amp A.C. Alternator Yellow A Red A Diode D.C. Output A.C. Output Lead Yellow Starting Motor D.C. Output Lead Red View A-A A.C. Output Solenoid Magneto Ground (2) Headlights Battery Switch Ammeter B M Key Switch S 3 Amp Alternator (D.C.) Magneto Ground Lead (Green) D.C. Output Lead (Red) 6 Amp Fuse on Some Early Models View A-A Diode S. HEAVY DUTY KEY SWITCH OFF-MAGNETO TO GROUND RUN-MAGNETO OPEN STARTBATTERY TO STARTER A A M. Green Insulation B.
Typical Wiring Circuits - continued 5 Amp Alternator System D.C. Output Red A A Light, etc. Solenoid D.C (+) Magneto Ground Switch Fuse Battery Ammeter B Key Switch A R 7 AMP & 12 AMP D.C. REGULATED ALTERNATOR 7 AMP ALTERNATOR SYSTEMS EXTERNAL REGULATOR-RECTIFIER Provided by Tecumseh, Regulator/ Rectifier Mounted and Located Under Blower Housing View A-A Magneto Ground Green Yellow S M A.C. Yellow Green Green A Red A A Yellow A A.C. Output Light, etc.
Typical Wiring Circuits - continued Remote Stop Terminal 10 AMP ALTERNATOR SYSTEMS Light Switch A.C. Output Yellow (2) Headlights Diode Solenoid Starting Motor Magneto Ground (+) A.C. (Yellow Leads) Yellow Resistor 1 Ohm 20 Watt (+) Magneto Ground (Green) 12 V. A Double Pole Double Throw Switch (+) Electric Clutch Ammeter (+) Battery B M S Starter Key Switch A Green (-) Light, etc. Solenoid A.C. Output Switch + Battery - (+) Ammeter B A M RS A.C. B+ A.C.
Typical Wiring Circuits - continued 20 AMP ALTERNATOR SYSTEMS Magneto Ground (Green) Yellow A.C. Output (Yellow) A A Green Magneto Ground Solenoid Light, etc. (+) Switch + Battery B Ammeter R A.C. A.C. A B+ M S Regulator/ Rectifier D.C. (+) Provided by Tecumseh, Regulator/Rectifier Mounted and Located Under Blower Housing Fuse Magneto Ground Lead (Green) View A-A D.C. Output Lead (Red) Green A Red A Magneto Ground Solenoid Light, etc. (+) D.C.
Peerless Identification RIGHT ANGLE DRIVES 1100 SERIES 100 SERIES 1200 SERIES A or B A or B A 700 SERIES 600 SERIES A A or B A A A or B 2600 SERIES 2800 SERIES 900 SERIES 920 SERIES 930 SERIES A 810 SERIES 801 SERIES 910 SERIES A A 1300 SERIES A 915 SERIES A 2400 SERIES A 820 SERIES 2300 SERIES 2500 SERIES A or B A A or B MST and VST SAMPLE (OLD STYLE) MOD 506 PEERLESS 1 275 1374 SAMPLE (NEW STYLE) MST205- ooo llllllllll SERIAL 6 0 0 2 Individual Serial Number Manufactured o
Peerless Identification - continued The recent warranty audit referenced in bulletin number “123” suggested we review the way our new Tecumseh/Peerless® models are identified. The review found improvements were needed in the identification system to make them standard with the new emission regulation’s requirements covering engine product and the “New ESA 157 Claim Form”. As a result, we have changed the product ID tag to make it easier to read.
Transaxle Troubleshooting In-Line Shift Models (i.e. 800, 820, 915, 920, 930 MST) Transaxle troubleshooting can be a mystery to many technicians, but by using a common sense approach that most technicians use for engine troubleshooting, the mystery will disappear and be replaced with confidence, skill and eventually, mastery of transaxle service. Before you begin to take off the wheels (the hardest part of transaxle repair) check the associated equipment. A. Check belts for proper adjustment. B.
Hard Shifting Transaxles and Drive Belts Often hard shifting is blamed on an internal problem in the transaxle. To determine if the problem is transaxle or equipment related make these simple checks. 1. Turn the unit off so that all power is removed to the transaxle 2. With the unit off move the shift lever through the shift gate. Movement of the lever should have only slight resistance. The shifting effort should be equal when the engine is off and when running.
VST Troubleshooting The information on this page has been provided to help understand the internal operation of the VST. Do not use this information to attempt any internal repairs. Tecumseh's current policy on hydrostatic transaxles that have internal failures is to replace the complete unit. This has not changed. However, Tecumseh would like to provide a failure checklist to assist in making an accurate evaluation of the complete tractor to eliminate any unnecessary replacements.
Peerless Torque Chart TORQUE VALUE MODELS AFFECTED PART Bolt 5/16-18 (Housing) Nut 5/16-18 (Drive Gear) Bolt 1/4-20 (Case to Cover) Bolt 5/16-18 (Axle Support Housing) Bolt 1/4-20 (Shift Lever Housing) Bolt 1/4-20 (Brake-Disc) Bolt 1/4-20 (Case to Cover) Bolt 1/4-20 (Brake-Disc) Bolt 5/16-18 (Case to Cover) Bolt 1/4-20 (Bearing Cap) Bolt 1/4-20 (Differential) Bolt 1/4-20 (Brake Disc) Bolt 5/16 x 18 Bolt 5/16 x 18 Bolt 1/4-20 (Case to Cover) Bolt 1/4-20 (Shift Lever Housing) Bolt 1/4-20 (Differential) Bolt
Lubrication Requirement PEERLESS LUBE CHART TRANSAXLES Model No. 600 800 801 820 900 910 915 920 930 1200 1301 1305 1309 1313 1302 1303 1304 1306 1307 1308 1310 1311 1312 1314 1315 1316 1317 1318 1320 1321 1322 1325 1328 1329 1319 1323 1326 1327 LTH MST200 VST205 and 1800's 2300 2400 2500 Quantity 24 oz./710 ml Oil 30 oz./887 ml Grease 36 oz./1065 ml Grease 36 oz./1065 ml Grease 26 oz./769 ml Grease 18 oz./532 ml Grease 10 oz./296 ml Grease 30 oz./887 ml Grease 30 oz./887 ml Grease 48 oz.
TECUMSEH 4-CYCLE LUBRICATION REQUIREMENTS We often get questions from both customers and dealers regarding the type and brand of oil we recommend. Tecumseh recommends the use of a high quality, brand name petroleum based oil in our engines. Very few air cooled engines have any type of oil filtration system, making regular oil changes critical to remove impurities from the engine and maximize engine life.
TECUMSEH 2-CYCLE ENGINE OIL REQUIREMENTS The proper type and ratio of two cycle oil is critical to long life and low maintenance of the engine. The use of non certified oils and improper mix ratio’s can cause severe engine damage and possibly void warranty consideration.
Spark Plug Replacement 4-CYCLE SPARK PLUG Service Number 34046 Service Number 33636 RL86C RJ17LM † H30-80 HM70-100 OHM120 * OVXL120, ‡ OHSK110-130 * OVXL/C120 OVM120 * OVXL125 Note: Service Number 35552 * OVXL models with specification nos. 202700, 203000 and up, use RN4C. † ‡ OHM 120 models with specification nos. 224000 and up, use RN4C. OHSK 110, 120, 130 models with specification nos. 223000 and up, use RN4C.
Head Bolt Torque Sequence LEV, TVS75-120, H, HSK30-70, HS, HSSK40-50, V50-70, TVXL105-115, TVM125-140 Torque bolts in 50 in. lb. (5.5 Nm) increments. TVM-TVXL170-220, VM, HM, HMSK80-100 Torque bolts in 50 in. lb. (5.5 Nm) increments. HH, VH80-120 Torque bolts in 50 in. lb. (5.5 Nm) increments. OHV11-17, OH120-180, OHM, OHSK, OVM, OVXL Torque bolts in 60 in. lb. (7 Nm) increments. OVRM40-60, OHH, OHSK50-70 Torque bolts in 60 in. lb. (7 Nm) increments. VLV40-6.75 Torque bolts in 50 in. lb. (5.
Valve Clearance Engine Model LAV35,50 LEV80-120 TVS75-120 ECV & TNT100-120 H30-35 & HS40-50 VLV40-6.75 TVT (V-Twin) TVM125-220 V & VH50-70 H & HH50-70 HM70-100 & HHM80 OHSK80-130, OHM, OVM120 OVXL120 & OHV11-17 HH100-120 OH120-180 OVRM40-6.75 OHH/OHSK50-70 HSK60-70 HMSK80-100 Valve Clearance (Cold) * ±.002 (.05 mm) Intake Valve Exhaust Valve .006" .006" (.004" - .008") (.004" - .008") .15 mm .15 mm (.10 - .20 mm) (.10 - .20 mm) .006"* (.15 mm) .004 (.10 mm) .006"* (.15 mm) .004 (.10 mm) .010"* (.
Recoil Quick Reference Parts During the past few years we have introduced you to several new styles of recoil assemblies. These recoils are used on all small and medium frame series engines. To assist you in making repairs, we have developed the quick reference illustrations below. By looking at the direction and style of ribs between the inner and outer parts of the pulley, you can use this chart to obtain the correct parts. Due to various ropes and housings, these parts will not be shown.
Tecumseh Flywheel Key Quick Reference Identification Chart Keys are drawn to full scale.
Primer Bulb Identification Caution must be used when replacing carburetor primer bulbs. Using the wrong primer bulb could cause hard starting and operating problems. Currently, Tecumseh uses five different carburetor mounted bulbs. To avoid problems, use the Master Parts Manual for the correct application. The primer bulbs offered feature two different shapes; derby and stepped (or hourglass).
Piston Ring Installation Piston ring orientation: Compression rings may have either an inside chamfer or an outside notch. Inside chamfers always face up towards the top of the piston. Outside notches, which are generally the second compression ring always face down towards the skirt of the piston.
Quick Reference for Dipsticks SCREW-IN DIPSTICK FEMALE THR’D, PLASTIC TUBE SERVICE NO. ID NO.
4 Cycle Quick Reference - Model Letter Designation ECH - Exclusive Craftsman Horizontal ECV - Exclusive Craftsman Vertical H- Horizontal Shaft HH - Horizontal Heavy Duty (Cast Iron) HHM - Horizontal Heavy Duty (Cast Iron) (Medium Frame) HM - Overhead Valve Vertical (Medium Frame) OVM - Overhead Valve Vertical (Medium Frame) OVRM - Overhead Valve Vertical (Small Frame) (Rotary Mower) OVXL - Overhead Valve Vertical (Medium Frame) (Extra Life) Horizontal Medium Frame HMSK - Horizontal Medium Fr
4 Cycle Quick Reference for Spec.
Metric Conversions Factors (approximate) Conversions TO Metric Measures Symbol in. in. ft. yd. mi. When You Know inches inches feet yards miles Multiply By 25.4 2.54 30 0.9 1.6 To Find millimeters centimeters centimeters meters kilometers Symbol mm cm cm m km MASS (weight) oz. lb. ounces pounds 28 0.45 grams kilograms g kg VOLUME tsp. Tbsp. fl. oz. c pt. qt. gal. in³ teaspoons tablespoons fluid ounces cups pints quarts gallons cubic inch 5 15 30 0.24 0.47 0.95 3.8 16.
