4---6
A
D
C
B
Figure 4---9. Alternator Brush Assembly
4.4.6Slip Ring Servicing
Clean brush contacting surfaces with fine crocus
cloth. Wipe dust and residue away.
If surfaces are worn beyond this restoration, replace
entire rotor assembly.
4.4.7Alternator Installation
a. Make sure negative battery terminal is discon-
nected.
b. Install alternator to mounting bracket with the
alternator pivot bolt and adjustment arm bolt loosely in
position.
c. Place V---belt on alternator sheave.
d. Check the center alignment of the generator
driving pulley and alternator pulley, to ensure proper
drive. Pulley misalignment will create excess belt wear
and limit alternator bearing life. The center line of the
alternator sheave, and the driving sheave must be in line.
e. Pivot alternator to place tension on belt. For
correct belt tension see paragraph 4.5.1.a.3. Tighten
pivot and adjustment bolts.
f. Connect wiring to alternator.
g. Connect battery cable. Start unit and check for
output per paragraph 4.4.4.
4.5 SERVICING AND ADJUSTING V---BELT
WARNING
Beware of moving V---belts and belt driven
components
NOTE
Frayed, cracked or worn V---belts must be
replaced. After installing a new belt, it is
advisable to check the adjustment after running
the unit for three or four hours. This is to allow
for the initial stretch which is common on new
belts. Once this initial stretch has taken place the
belt may be checked at regular intervals.
4.5.1Water Pump/Alternator V---Belt
The V---belt is driven by a sheave on the engine
crankshaft. Adjustment is achieved by altering position
of the alternator.
a. Replacing the V---Belt
1. Loosen the idler bracket pivot bolt.
2. Replace belt. Use hand force only on idler pulley
to tighten belt.
Do not use pry bar or excessive force as it
may cause water pump/alternator bearings to fail.
When
belt is tight, tighten idler bracket pivot bolt.
3. Check belt tension, correct specifications are
40---45 lbs. on the Burroughs gauge, Carrier Transicold
Part No. 07---00203.
4.6 SERVICING THE GENERATOR
(MAIN ALTERNATOR)
4.6.1Preventive Maintenance and Operating Precau-
tions
Costly repairs and down time can usually be pre-
vented by operating electrical equipment under condi-
tions which are compatible with those at which the
equipment was designed to operate. Follow the instruc-
tions outlined below to insure maximum efficiency of the
electrical equipment.
a. Cooling
Keep all cooling parts clean and make certain
sufficient room is left on all sides for a plentiful supply of
fresh coolant air flow.
DO NOT EXCEED TEMPERA-
TURE RISE AS SHOWN FOR 80
_
C (176
_
F) ABOVE A
40
_
C (104
_
F) AMBIENT
. This ensures that the insulation
NEMA Class “F” will not be damaged.
DO NOT
EXCEED RATED LOAD
except as specified for the
equipment
. OPERATE GENERATOR AT RATED
SPEED
. Failure to operate generators at rated load or
speed will cause overheating and possible damage to
windings due to over voltage or current.
b. Bearing Replacement
Factory lubricated shielded bearings will normally
provide several years of trouble free service when
operated under normal conditions. Excessive bearing
load and adverse environment conditions will greatly
shorten bearing life. Should bearing failure occur,
bearings can be replaced.
ALWAYS REPLACE WITH
THE SAME TYPE BEARING AS INSTALLED AT THE
FACTORY. CHECK PARTS LIST FOR PART NUMBER.
Include generator serial number when ordering bearings.
Do the following to remove bearing:
1. Remove bearing cap. (See Figure 4---10)
2. Remove bearing with the use of a bearing or wheel
puller.
3. Install new bearing. Ball bearings on Lima genera-
tors are pre---lubricated and require no further lubrica-
tion for the life of the bearing.
4. Replace end cap.
2
1
3
4
1. Bolt
3. Bearing
2. Bearing cap
4. Rotating diode bridge
Figure 4---10. Rectifier Removal
c. Rotating Diode Bridge (Rectifier Assembly) Replace-
ment
The rotating diode bridge can be removed and
replaced. Overcurrent, overvoltage, overspeed, or re-