Generac Power Systems 53187 - Manual (Page 115)

PARTS
ENGINE ELECTRICAL SYSTEM
Type 1 Engine Cranking System (Contin­
ued)
THE STARTER (CONTD):
Brush Assembly: Replace brushes and brush
springs at every overhaul. Replace any brush that Is (a)
worn to 5/16 inch (or less) as measured on the short
side of the brush; or (b) that has been in contact with
grease, oil or cleaning fluid. When assembling brushes,
place their chamfered side away from the springs.
Tighten brush screw to 30-35 inch-pounds. Tighten the
hot stud nut to 45-50 inch-pounds.
Type 2 Engine Cranking System
GENERAL:
Type 2 cranking systems employ a later production
engine control circuit board. This circuit board has
taken over the functions of a crank relay (CR1) and a
run relay (CR2) that were required on Type 1 systems.
The same starter motor is used on Type 2 systems that
was used on Type 1 systems. Circuit operation is
discussed and illustrated on Page 5.1-3 (Figure 3).
MAJOR COMPONENTS:
Major parts of the Type 2 engine cranking system
include the following:
□ 12 volts Battery.
□ 10 amp circuit breaker (CB3).
□ 14 amp fuse (FI).
□ Engine Control circuit board.
□ Start/stop switch.
□ Starter contactor.
□ Starter motor.
Crank relay (CR1) and run relay (CR2) are not
required on Type 2 systems, since the circuit board has
taken over their functions. Other system components
are the same as on Type 1 systems.
Type 3 Engine Cranking System
GENERAL:
Type 3 DC control systems utilize the later produc­
tion engine control circuit board and, for that reason,
the externally mounted crank and run relays are not
required. In addition, a pull-in type solenoid Is an Inte­
gral part of the starter. See "Operating Diagram- Type
3 DC Control System' on Page 5.1-4 (Figure 4).
MAJOR COMPONENTS:
Major components of the Type 3 cranking system
are as follows;
□ A 12 volts battery.
□ Circuit Breaker (CB3) and fuse (FI).
□ Engine control circuit board.
□ Start/stop switch.
1
SECTION 5.2
ENGINE CRANKING SYSTEM
□ Starter relay (SR).
□ Starter.
NOTE: For Information on the battery, circuit
breaker, fuse and start/stop switch, refer to "Type
1 Engine Cranking System“ (Pages 5.2-1 to 5.2-3).
The engine control circuit board Is briefly dis­
cussed In Section 5.1.
STARTER RELAY:
Battery voltage is always available to the normally-
open contacts of the starter relay (SR). When the
start/stop switch is set to "Start", Terminal 3 of the
circuit board and Wire 17 are connected to ground.
Circuit board action then delivers 12 volts DC to the
starter relay (SR) coil, to energize the relay. The starter
relay contacts close to deliver battery voltage to the
starter solenoid on thé starter. The solenoid energizes
to (a) close the heavy duty solenoid contacts and (b)
engage the starter with the engine flywheel by actuating
the shift lever. With the heavy duty solenoid contacts
closed, battery voltage is delivered directly to the starter
motor and the engine is cranked.
TYPE 3 STARTER ASSEMBLY:
An exploded view of the Type 3 starter assembloy
is shown In Rgure 9 on next page. The following apply:
□ Inspect for excessive wear on all bearings, gears,
shafts, etc.
□ Inspect the shift lever assembly for wear or damage,
replace with new shift lever kit if necessary.
□ Tighten thru-bolts to 75 Inch-pounds.
□
Replace brushes and brush springs at every over­
haul. Replace any brush that is worn excessively or
that has been in contact with grease, oil or cleaning
fluid. Check that brushes ride properly on the arma­
ture when reassembling.
□ Use a growler to check the armature for an open,
shorted or grounded condition.
PAGE 5.2-5