Section C - Electrics
Starter Motor
Dismantling and Assembly
C - 51 C - 51
9803-9450-1
Servicing
Renew brushes 14 and 14A if their length is less than 8mm
(0.3in).
Clean the commutator A. If individual copper bars are
burned or eroded the armature has broken windings and
must be renewed. Otherwise polish with fine grade glass
paper (not emery). Renew armature if commutator
diameter is 38mm (1.5in) or less.
Check the field windings for open circuits by connecting an
ohmmeter (0 to 100 ohms) between the stud terminal B
and each positive brush 14A in turn. A high or infinity
reading indicates an open circuit. Similarly, connect the
meter between brushes 14A in turn. A high or infinity
reading indicates a short circuit between the coils and the
yoke. Renew the coils as necessary, removing screws 36
with a pole shoe screwdriver C50 (obtainable from Lucas
dealers).
Check bronze bushes 32 and 34 for wear.
Assembling
Soak new bushes 32 and 34 in clean warm engine oil for
24 hours before fitting.
Align crosspin C with the notches in the brake shoes 28
before assembling brush carrier and back plate to motor
yoke. Ensure that brushes 14A are correctly located in the
insulated brush boxes.
Smear drive shaft splines and operating collar bearing
surface with JCB MPL Grease before assembly. Assemble
operating fork 19 with curved face toward the armature.
Set the movement of drive pinion 24 by connecting a 6V
battery and switch as shown. Operate switch and check
dimension D. Adjust to 0.13-1.14 mm (0.005-0.045in.) by
slackening locknut 17 and rotating eccentric pin 18 as
necessary. Retighten locknut.
Fig 43.
To Next Page
Loading...
