JLG 534D-10 - Manual (Page 158)

Electrical System
9.10 534D-9, 534D-10 & 544D
9.7 CHARGING CIRCUIT
Before using a battery charger, an attempt can be made
to recharge the battery by jump-starting the machine
(Refer to the appropriate Operation & Safety Manual).
Allow the engine to run, which will enable the alternator to
charge the battery.
If the engine alternator charging warning indicator
illuminates, perform the following checks:
1. Check the all battery cable connections at the
battery, and verify that they are clean and tight.
2. Check the external alternator wiring and
connections, and verify that they are in good
condition.
3. Check the fan belt condition and tension.
4. Run the engine and check the alternator for noise. A
loose drive pulley, loose mounting hardware, worn or
dirty internal alternator bearings, a defective stator
or defective diodes can cause noise. Replace a worn
or defective alternator.
9.7.1 Alternator
a. Alternator Removal
1. Open the engine cover.
2. Remove the battery negative (-) cable at the negative
battery (-) terminal.
3. Install a 1/2" square drive ratchet into the square
hole in the serpentine belt tensioner bracket.
4. While lifting the automatic belt tensioner away from
the belt, remove the fan serpentine belt.
Note: Record how the alternator is installed to ensure
correct installation later.
5. Label and disconnect the wire leads.
6. Remove the lower mounting bolt (1) securing the
alternator to the lower mounting hole on the engine.
7. While supporting the alternator with one hand,
remove the upper mounting bolt (2) from the
alternator mount. Remove the alternator from the
machine.
b. Alternator Installation
1. Position the alternator and align with the upper
alternator mount on the engine bracket. Insert the
upper mounting bolt through the alternator mount.
DO NOT tighten completely at this time.
2. Align the lower alternator mount hole with the lower
mounting bracket on the engine, and insert the lower
mounting bolt. Tighten the lower bolt and upper
capscrew securely.
3. Place a 1/2" square drive ratchet into the square
hole on the serpentine belt tensioner bracket. Apply
pressure against the tensioner bracket and route the
serpentine belt onto the alternator and engine
pulleys. Release and check the tensioner pulley to
verify that it is pivoting freely in order to provide the
proper tension on the belt. Check for proper belt
alignment. (Refer to the appropriate Operation &
Safety Manual.)
4. Connect the wire leads.
5. Connect the negative (-) battery cable to the negative
(-) battery terminal.
6. Close and secure engine cover.
MX1190
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