7 months ago

Bobcat Engine VH4D Repair manual


WIRING CIRCUIT, Flg. 42, Flg. 43 The fool-proof type connectors used to prevent incorrect wiring from the stator to the rectifier and regulator modules. To disconnect plugs, squeeze outer ends of receptical and pull apart. The rectifier is insulated from ground, but the stator and regulator module are grounded to the engine through their mounting surface. The regulator module therefore should not be removed and mounted at some remote location. This is a negative ground circuit. Connect grotmd strap from negative post of battery to starting motor flange, or good clean grounding surface on engine. PRELINIMARY FLYWHEEL ALTERNATOR SERVICE PROCEDURE: TESTS Wsual Inspection should be made to eliminate conditions that may be interpreted as a defected alternator. Examine leads for broken or loose connections, and make sure modules are securely mounted. The regulator module must be mounted to a metal surface for grounding purposes, (Test 5.0) while the rectitier module, although insulated from ground, should be securely mounted for heat dissipation. The mounting surfaces must be clean and free of contaminants, oil, grease, etc. Check Battery. Use a Automotive battery in good condition, fully charged and with clean, tight terminal connections. Check Ammeter. Be certain the ammeter is functioning correctly. Amperage output is regulated by engine speed. The maximum amperage output for Model VH4D is: Maximum RPM IOAMP System 25 AMP Syetem When assured that the problem is with the alternator, follow the tests outlined in ’Trouble Shooting’. TROUBLE SHOOTING FLYWHEEL ALTERNATOR 12 VOLT - 10 AMP and 25 AMP Systems Trouble Shooting Procedure is a guide showing methods of testing the charging components. The following chart of Tests 1.0 to 4.1 are with the engine running, and substituting known good components in place of suspected faulty components. $totic Tests 5.0 thru 7.2, following the running tests, are more conclusive but some test require special Wisconsin Test Lights. Problem: Battery Overcharge Test 1.0 Engine not running check battery with DC Voltmeter. I. 1 If voltage is greater than 13.5 volts 1.2 With engine running at full RPM, check battery voltage with DC Voltmeter. I. 3 [[ the charge increases beyond 13.5 volts. 1.4 If the charge remains under 13.5 volts. Possible Cuase & Remedy 1.1 Place 12 volt light bulb or carbon pile across battery to reduce voltabe to below 13.5 volts. 1.3 Faulty regulator, l~eplace, -- static check regulator per "rest No. 5.1. 1.4 Alternator functioning properly. Check battery condition. 2800 9 amps 20 amps SOLENOIDSWITCH_ SPARK PLUGS Fig. 43, WIRING DIAGRAM ELECTRICAL SYSTEM WITH 10 AMP or 25 AMP FLYWH EEL ALTERNATOR 12 VOLT 7 BATTERY I MOTOR 3 1 ~"’~L-~--411 ~ ’ I~--- ~--~ R at’o RECTIFIER REGULATOR ~ I "~ ~ Ot , n cHoK I ~ STARTER (~ST ATOR term. ~. ~ ~ ~ / II HI-TEIP (optional) Make connections; for lights at charge SWITCH side of ammeter (negative terminal). COIL 29

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