TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 290 of 894
TRUCK SERVICE MANUAL
ELECTRICAL
b. Opens are usually found where the conductors
are joined to the commutator. Loose or poor
connections will cause arcing and burning of the
commutator. If the bars are not burned too bad,
resolder the leads in the riser bars and turn the
commutator down in a lathe. Then under cut the
insulation between the commutator bars 1/32".
c. Grounds in the armature can be found using a
test lamp and prods, see Fig.
12 If the lamp
lights when one prod is positioned on the
commutator and the other prod on the armature
core or shaft the armature is grounded.
If the commutator is worn, dirty or out-of-round
or the insulation is high, the commutator should
be turned down and under cut.
Fig.
12
Testing Armature for Grounds
3. Field Coils-- Check field coils for grounds and
opens with a test lamp.
a.
Grounds With the field coil ground
disconnected, position one test prod on
the field frame and the other to the field
connector.
If the lamp lights the field coils
are grounded and must either be replaced
or repaired.
b.
Opens If the test lamp does not light when
the prods are connected to the ends of coil
leads, the field coils are open.
A pole shoe spreader and pole shoe screw driver
should be used if the field coils are to be removed.
Extra
caution should be taken in replacing the field coils to
prevent grounding or shorting when they are tightened in
place.
If the pole shoe has a long lip on one side, it
should be assembled in the direction of armature
rotation.
CLUTCH ASSEMBLIES
Four kinds of clutches or motor drives (a heavy
duty sprag, a Positork drive, an intermediate duty type
and a splined drive) may be used on the enclosed shift
lever heavy duty motors.
The intermediate clutch may be either the sprag
type or the four roll type.
All four types are moved into
mesh with the flywheel ring gear by action of the
solenoid.
The pinion will remain engaged until starting is
assured and the solenoid is interrupted.
4. Reassembly is the reverse of the disassembly.
Heavy Duty Sprag Clutch and DR250 Drive
1. Remove the cupped pinion stop and split
washer.
When removing the cupped pinion stop
it will probably be damaged.
A new one will be
required at time of reassembly.
2. Remove remaining parts such as pinion washer
or retainer cups and baffle if equipped.
The
splined drive will have a spring cup (spring inside
cup).
3. DO NOT lubricate the sprags on heavy duty
clutches as they are lubricated for life with a
special lubricant.
4. Reassembly is the reverse of the disassembly.
REASSEMB LY
The reassembly procedure for the most part is the
reverse of the disassembly.
286
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