J a I) SERVICE BULLETIN REFERENCES 1983 19.35
TROUBLE SHOOTING Engine Won t Start or Hard Starting Possible Cause ALL MODELS No fuel in tank. Fuel valve off. Insufficient or excessive priming. Spark plug lead disconnected. Spark plug fouled. Low compression in cylinder (80 PSI min.) Incorrect air gap between C.D. pack and flywheel. C.D. pack defective. (Refer to CD Pack Testing, Pg.19) Primer hose disconnected from carburetor or connector. Primer hose restricted. (Refer to Primer System Draining, Pg. 20). Air filter restricted. Carburetor needle valve incorrectly adjusted. Throttle valve stuck closed. Carburetor-to crankcase screws not tight. Carburetor-to crankcase gasket leaking air. Float chamber screws loose. Float chamber gasket leaking air. Restriction in high speed nozzle. High speed nozzle loose. Float valve stuck closed. Restriction in fuel passages (tank, valve, hose, float valve seat). Float level set too low. Reed Valves stuck closed or bent open more than.015. Air leak between crankcase halves. Intake plug leaking or missing. Main bearing seals leaking. Exhaust system restricted. Zone Start Models Bail not pulled back against handle. Incorrect kill switch adjustment (see Fig. 16). Kill switch inoperative. (See Ignition Circuit Switch Troubleshooting, Pg. 17). Brake dragging on flywheel. Power Restart (PRS) Models Bail not pulled back against handle. Incorrect kill switch adjustment (see Fig. 16). Kill switch inoperative. (See Ignition Circuit Switch Troubleshooting, Pg. 17). Brake dragging on flywheel. Battery disconnected. Battery run down (should be 12.5 14 volts). Starter motor cable disconnected. Starter solenoid defective. Key switch and cable connect disconnected or loose from engine harness. Key switch defective or loose connectors. BBC Models Switch turned off. Switch defective or loose connectors. Ignition circuit ( Kill ) Switch (Zone & PRS Models) The following conditions are indications of Switch misadjustment or failure. Engine misfires when in self-propelling mode Adjust Switch (See Fig. 16) Engine stops if bail is against handle Adjust Switch (See Fig. 16), Engine won t start (no spark) Adjust or replace switch Primer System Draining not held extremely tight If a mower is tipped back on its handle (as shown below), fuel may run from the carburetor and settle in the lowest point of the primer line when the mach,ine is set upright. If this occurs, remove the primer hose from the carburetor and drain the fuel. Symptoms include rich running and hot starting problems. REVISED 1983 19-36 SERVICE BULLETIN REFERENCES
Wire Routing Diagram Power Restart (PRS) ( Battery A To Handle SERVICE BULLETIN REFERENCES. REVISED... 1983 19-37
A. Starter will notturnengine (1stcheck) 1. Bail not pulled back against handle completely. Trouble Shooting And Test Procedures To Be Followed In Sequence Below (For Plug And Switch References See Page 19-22) 2. Key Switch not actuated functioning. or not 3. Plugs A-B-C- or E not connected. 4. Brake Switch (G) not actuated or not functioning. 5. Low charge in battery. B. Starter will notturnengine (2ndcheck) 1. Disconnect plug (C) from battery. 2. Connect volt-ohm-meter (VOM) across plug ((2-2). 3. Meter should indicate. High Resistance To Engine Low Resistance OHMS ± 10 MIN. 4. If the meter does not indicate the correct reading on the resistance scale, a. See alternator test procedures pages 13-19 & 13-20. 5. Connect meter (vom) as illustrated in step (3-A). 6. Pull bail back against handle. 7. Turn switch key. 9. If there is no reading on the meter, proceed as follows otherwise if there is a reading on the meter, proceed to step (14). 10. With no reading on step (9) Disconnect plug (a), connect a jumper lead across plug (A-2) shorting terminals to each other. 11. Pull bail back against handle. If meter indicates 80 ohms ± 15, the key switch is defective. 8. Meter should indicate 80 ohms ± 15 on low resistance scale 19-38 1983 SERVICE BULLETIN REFERENCES
12. Remove jumper lead from (A-2). Connect the jumper lead between terminals (4 and 3) on plug (B-2). See below. PLUG (B-2) JUMPER LEAD REAR VIEW 13. If meter indicates 80 ohms ± 15, the brake (kill) switch is defective or requires readjustment. If the meter does not indicate 80 ohms ± 15, the solenoid relay is defective and requires replacement. 14. Connect jumper lead across terminals (4 and 2) on plug (B-2) PLUG (B-2) JUMPER LEAD REAR VIEW 15. If meter indicates 3 ohms 2.5, replace solenoid relay. If meter does not indicate 3 ohms ± 2.5, starter the assembly requires replacement.
Wire Routing Diagram Zone (manual) Start Tubing 19-40 SERVICE BULLETIN REFERENCES