Conditions Affecting Starter Motor Performance; Starter Drive; Checking Starter Motor Drive; Disassemble Starter Motor Drive - Briggs & Stratton 405777 Series Manual

Conditions Affecting Starter Motor
Performance
1. A binding or seizing condition in the starter motor bear-
ings.
2. A shorted, open or grounded armature.
a. Shorted, armature (wire insulation worn and wires
touching one another). Will be indicated by low or
no RPM.
b. Open armature (wire broken) will be indicated by
low or no RPM and excessive current draw.
c. Grounded armature (wire insulation worn and wire
touching armature lamination or shaft). Will be in-
dicated by excessive current draw or no RPM.
3. A defective starter motor switch.
4. Broken, damaged or weak magnets.
5. Starter drive dirty or binding.

STARTER DRIVE

Checking Starter Motor Drive

When the starter motor is activated, the pinion gear should
engage the flywheel ring gear and crank the engine. If the
starter motor drive does not react properly, inspect the helix
and pinion gear for freedom of operation, Fig. 7.
The pinion gear should be inspected for damaged teeth.
Pinion gear must move freely on helix. The parts may be
washed in a solvent such as Stanisol ® or Varsol ®.

Disassemble Starter Motor Drive

WARNING: TO PREVENT EYE INJURY always
wear eye protection when removing C-ring.
1. Place counterbore side of Tool #19436 over retainer and
align drive pins with open end of C-Ring, Fig. 8.
Important: If retainer has a notch as shown, DO NOT align
drive pins with notch. If necessary, rotate notch away from
open end of C-Ring.
2. Place palm of hand over tool and push down evenly on
tool to compress spring washer.
3. While applying pressure, turn knurled knob clockwise
until C-Ring pops off. Discard C-Ring.
4. Remove retainer, return spring, spring washer, pinion
gear, and starter clutch.
4
TSM
Fig. 7 − Starter Drive
DRIVE PINS
TOOL # 19436
DO NOT ALIGN DRIVE
PINS WITH NOTCH
Fig. 8 − Removing C-Ring
RETAINER