GMC 4000 Series Service Manual page 411

Sec. 6Y
Page 400
STARTING SYSTEM
Figure 8 — Circuit for Checking Motor Free Speed
5. Connect a jumper lead from "battery" term ­
inal to switch terminal on solenoid.
6. Observe ammeter, voltmeter and tachom­
eter, and compare readings with "No Load Test"
specifications listed in "Specifications" at end of
this section.
STARTER SOLENOID
Starter solenoid is used to shift the starter
drive pinion into engagement with flywheel teeth
and to complete the circuit from battery to starter.
STARTER MODEL
Typ e of Drive
Voltage
Rotation (V iew ed at Drive En d )
No Load T est
Volts
Am ps. (M in .)
Am ps. (M a x.)
RPM (M in .)
RPM (M a x.)
in c lu d e s Solenoid
(a )P in io n Clearance 0.010"-0.140"
STARTER SOLENOID MODEL STARTER SOLENOID MODEL
Voltage Voltage
Curren t Consumption Curren t Consumption
Both W indings Both W indings
Am ps Amps
Volts Volts
Hold-ln W inding n uiu-in vvinuing
U n H I n W i n r t m r r
Amps Am ps
Volts
Volts
STARTER INTERLOCK RELAY
Model...............................................................................................................................
M a k e .................................................................................................................................
Point Opening ( I n . ) .......................................................................................................
Opening Voltage (R a n g e ).............................................................................................
G M C S E R V I C E M A N U A L
STARTING MOTOR SPECIFICATIONS
1107375(a) 1107376(a)
Overrunning O verrunning
Clutch
Clutch
12
12
CW
10.6 10.6
55*
65*
100* 95*
3600 3800
5100
1114344
1114359
12
12
41-47
10 10
14.5-16.5
10 10
Solenoid has two windings, the pulling winding
and the holding winding. When ignition switch is
turned to "START" position both windings are
energized, producing a magnetic field which pulls
the plunger in. Inward movement of plunger shifts
starter pinion into engagement with flywheel ring
gear teeth, and closes main contacts in the so le­
noid switch to complete circuit from battery to
starter.
The pulling winding draws comparatively heavy
current for a short interval. This is required to
shift the pinion into engagement. The holding wind­
ing also aids the pulling winding. As soon as plung­
er closes the main switch contacts, pulling winding
is de-energized and only the holding winding draws
current for the balance of the starting cycle.
SOLENOID MAINTENANCE
Solenoids require no periodic maintenance
other than keeping the terminals clean and tight.
Always check action of solenoid if it has been re­
moved. If unit fails to function, first check wiring
before condemning the solenoid. Solenoid windings
can be checked for current draw, open circuit, or
shorts. Refer to "Specifications" at end of this s e c ­
tion for current values. Solenoid coil, term inals,
and switch plunger can be replaced if burned or
otherwise damaged. Whenever the solenoid is re­
placed on overrunning clutch type starting motors,
pinion clearance must be checked, as previously
directed under "Pinion Clearance Check."
1108360(a) 1108368(a)
Overrunning O verrunning O verrunning
Clutch Clutch
12
12
CW CW
10.6 10.6
65* 49*
100* 87*
3600 6200
6000 5100
1114362 1114362
12
41-47
41-47 41-47
10 10
14.5-16.5 14.5-16.5 14.5-16.5
10
....Delco-Remy
....0.017-0.033
1113686"a)
1108372(a)
O verrunning
Clutch Clutch
12 12
CWCW CW
11.0
11.8
—
1 3 0 *
72 160 *
5000
6025
10,700 —
7000
1114343 1115510
12
12 12
41-47
70.4-77.8
10 10
14.5-16.5 18-20
10 10 10
1115848
3.7-5.2