PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 6: ELECTRICAL
PA1553
46
CAUTION
When replacing the alternator on the vehicle,
ensure that an alternator with the proper drive
ratio is used. Installation of an alternator with
any other drive ratio will result in severe and
costly damage to the alternator and engine.
7.8.4 Alternator Reassembly
Reassembly is the reverse of disassembly.
NOTE
When tightening the outside nut on the “DC”
output terminal, torque the nut to 30- 35 lbf-ft
(41-47 Nm). The lower nut should be
supported while doing so.
When reinstalling diodes, tighten to a torque of
9-11 lbf-ft (12-15 Nm).
7.8.5 Output check
When removed from the engine, the alternator
may be checked without circulating oil on a test
bench, providing the output is limited to 100
amperes or less. The alternator may be bench
tested without circulating oil at outputs
exceeding 100 amperes, as long as the period
of operation is limited to less than 15 seconds.
CAUTION
Operating the alternator at outputs greater
than 100 amperes without adequate oil
circulation for periods exceeding 15 seconds,
will cause the alternator to overheat, resulting
in damage to the winding and diodes.
If the alternator is to be operated at an output
greater than 100 amperes for longer than 15
seconds, circulating oil must be provided. SAE
30 engine oil must be applied to the connection
on the diode end cover at a pressure of 35 psi
and at a temperature of 60
o
F to 220
o
F (16
o
C to
104
o
C). This will provide an oil flow of about one
gallon per minute.
To check the alternator on a test bench, make
electrical connections as shown in figure 24.
Make sure the negative battery terminal is
connected to the alternator frame.
7.9 ALTERNATOR DRIVE BELT
Removal
1. Insert a ¾‘’ socket drive into the tensioning
arm opening (Fig. 31).
2. Twist the tensioning arm to slacken belt.
3. Remove belt.
Installation
Installation of the alternator drive belt is the
reverse of removal.
7.9.1 Adjustment
Correct belt tension is required to maximize belt
life. The tensioning arm maintains proper belt
tension, no adjustment is required.
Check for wear and proper tension every 6,250
miles (10 000 km) or twice a year, whichever
comes first.
FIGURE 31: ALTERNATOR DRIVE BELT 06509
8. VOLTAGE REGULATOR (DELCO)
The 24 volt regulator used with Delco alternator
is located in the engine compartment R.H. side
area.
The transistor regulator illustrated in figure 32 is
an assembly mainly consisting of diodes,
capacitors, resistors and transistors. These

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English