EXHAUSTINTAKEVALVE

*Maximum allowable before replacement, reboring, regrinding. **Measure at top of guide with valve closed.

DIMENSION

Flywheel Alternator

ALTERNATOR/RECTIFIER–REGULATOR SERVICE

No adjustments are possible on the alternator system and field service on this system is not recommended. The faulty part should be replaced by a new part. To pinpoint a faulty part, use the following procedure:

PROBLEM

Dead Battery or Weak Battery.

CAUSE

No charge to battery.

Faulty battery.

Engine not grounded.

Correction

Perform Test 1.

Perform Test 2.

Perform Test 3.

Ground engine to frame.

Faulty Battery. Overcharged Battery (uses excessive amount of water, or feels hot to touch).

Charge System Service

Low electrolyte level.

Low specific gravity. Dead cell.

The rectifier–regulator is not functioning properly.

Check.

Check.

Replace the battery.

Perform Test 3.

Adjustment of the charging circuit cannot be made. The rectifier/regulator is a sealed unit and repair can not be made. Replace any part that has a defect. A defective rectifier/regulator will often have an odor.

NOTE:Do not run the engine without a battery in the system. It will cause damage to the rectifier/regulator unit.

NOTE:Disconnect the wires from rectifier/regulator while welding on the Bobcat.

Problem

Battery has defect. Battery has low or no charge.

Cause

Electrolyte level is low. Specific gravity is low. A cell is dead.

Moisture in ignition switch. No charge to battery.

Battery has defect. Engine does not have electric ground.

Correction

Add distilled water. Charge battery.

Battery replacement. Clean switch.

Do test 1 & 2.

Do test 3.

Mark ground from engine to frame.

Excessive charge to battery (battery uses excessive amount of water or feels hot to touch).

Do test 3.

Charge System Checks

Test No. 1 (Fig. 71).

Charging System Test

Remove orange wire. Connect all other wires. Insert a small blade into the regulator end of connector to release the retainer on the spade terminal. Pull out the wire.

The rectifier/regulator is not operating correctly. +

Connect a red DC voltmeter to the B terminal on rectifier/regulator. Connect the black wire from the voltmeter to ground. Run the engine at full throttle with no load. Check the voltage.

1.Above 14 volts–the alternator system is ok. Check the battery cable connections at the battery and the starter solenoid.

2.Less than 14 volts–check for a defective rectifier/regulator (Test No. 2).

3.0 volts–check for a defective stator or rectifier/regulator (Test No. 2). Test No. 2 (Fig. 72)

Test No. 2 (Fig. 72)

Generator Stator Test

Remove connector at rectifier/ regulator. Connect voltmeter tostator wires. Connect all other wires. Also test the stator for circuit to ground. Stop the engine for this test. Use the ohmeter scale on the tester. The ohmeter should read infinity. Use tester with AC voltage scale. Disconnect the AC wire from the rectifier/regulator. Connect an AC voltmeter to the AC terminal and the AC wire. Run the engine at full throttle with no load. Check the voltage.

1.28 volts or more–the stator is correct. The rectifier/regulator has a defect. Replace the rectifier/regulator.

2.Less than 28 volts–the stator has a defect. Replace the stator.

Test No. 3 (Fig. 73)

Overcharge Test

Connect all wires and cables as in normal operation. Connect the red wire from a DC voltmeter to the common terminal of the starter solenoid. Connect the black wire from the voltmeter to the engine. Run the engine at full throttle with no load. Check the voltage.

1.Less than 14.7 volts–the alternator is correct. The battery has a defect and will not hold charge. Test the specific gravity of the battery. Replace the battery if necessary.

2.14.7 volts or more–the rectifier/ regulator has a defect. Replace the rectifier/regulator.