Table of Contents
Advertisement
www.WorkshopManuals.co.uk
Section C
40 - 2
Removal and Replacement
Disconnect cables and remove battery. Remove cables from
main starter terminal and solenoid terminal. Using special
tool 825/00410 (and adapter 825/99833 if required) unscrew
three securing nuts and remove starter motor.
Replace by reversing the removal sequence.
Dismantling
Note: Dismantle only to item 34 unless the field windings are
to be renewed. Test the windings electrically before
removing them from the motor yoke 15.
Using a slotted steel tube, displace ring 23 to permit
withdrawal of ring 22.
Allow brake shoes 28 to remain in the end plate 11 unless
requiring renewal.
Inspection
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 a
multimeter set to measure resistance (see Electrical Testing
Methods) 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 and the motor yoke 15. Any reading other than infinity
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.
9803/3280
Electrics
Starter Motor
Purchased from www.WorkshopManuals.co.uk
Assembly
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 0.13-1.14mm (0.005-0.045in.) by
slackening locknut 17 and rotating eccentric pin 18 as
necessary. Re-tighten locknut.
Section C
40 - 2
D
S02303A
Issue 1
Advertisement
Table of Contents
