GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 674 / 998

6P4-2 PG-200 (PMGR) STARTING MOTOR
9. C lu tc h
12. S h ift Lever
13. P lu n g e r
16. S o le n o id
19. B earing
22. A rm a tu re
31. TIG W e lds
32. R eturn S p rin g
33. P la ne ta ry G ear R e d u c tio n
A s s e m b ly
34. P e rm a ne nt M a g n e t F ield
35. B ru s h e s
36. W e lde d C o n n e c tio n s
37. P in io n S top
83. Drive End B e aring
F-05834
Figure 1— PG-200 (PMGR) Starting Motor
22
^ 2 1
C 7
26
22. B a tte ry
23. “ S ” Term inal
24. “ M ” T erm inal
25. “ BAT" T erm inal
26. V o ltm e te r
27. A m m e te r
28. T a c h o m e te r
29. Load S w itc h
30. C a rb o n Pile F-05835
Figure 2— No Load Test Hookup
desired, a carbon pile connected across the battery can be
used to reduce the voltage to the specified value. Compare
the test results as follows:
1. Rated current draw and no-load speed indicates nor­
mal condition of the starting motor.
2. Low free speed and high current draw indicates:
a. Too much friction. Tight, dirty, or worn bear­
ings or bent arm ature shaft allowing the arm a­
ture to drag.
b. S h o rte d a r m a tu r e . T h is c a n be fu r th e r
checked on a growler after disassem bly.
c. Grounded arm ature or fields. Check further
after disassembly.
3. Failure to operate with high current draw indicates:
a. A direct ground in the term inal or brush assem­
bly.
b. Seized bearings. This should have been noted
by turning the arm ature by hand.
4. Failure to operate with no current draw indicates:
a. Open brush leads.
b. Open arm ature coils. Inspect the com m utator
for badly burned bars after disassem bly.
c. Broken brush springs, worn brushes, high
insulation betw een the com m utator bars.
Look for these or other causes which would pre­
vent good contact between the brushes and
comm utator.
5. Low no-load speed and low current draw indicates a
high internal resistance due to poor connections,
worn leads, dirty com m utator and causes listed under
step 4.
DISASSEMBLY
If the motor does not perform to specifications, it may
need to be disassembled for further testing of the com po­
nents. Normally the starting m otor should be disassem bled
only so far as is necessary to make repair or replacem ent of
parts. As a precaution, it is suggested that safety glasses
be worn when disassem bling or assem bling the starting
motor.
Remove or Disconnect (Figures 3 through 6)
Tool Required:
J 28509-A Bearing Puller