Hobart 6921 Series Operation And Maintenance Manual page 103

OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
Engine and Controls
Trouble, Symptom & Condition
1. Engine will not start. Starter
will not crank engine.
February 28/94 Revised
Test or Inspection
a. Battery or batteries
discharged or faulty.
b. Batteries or starter not
properly grounded.
c. Air shut-off valve unlatched
and holding starter cut-out
switch open (see Fig. 3).
d. Starter cut-out switch
improperly adjusted, or
defective.
e. Defective start switch (S24)
or defective auxiliary
solenoid (L10).
f. Defective starter solenoid,
or starter.
Corrective Action
Check battery voltage and
specific gravity. Recharge or
replace.
12-V DC power not reaching
starter solenoid.
Check voltage at starter
solenoid input terminal (4, Fig.
2). Voltage should be
approximately 13.5 V. If no
voltage, check cables and
connections between starter
solenoid and power source.
Replace or repair cables and
connectors as required.
Check cable and all
connections.
Latch air shut-off valve by
pushing latch lever (8, Fig. 3)
down. If valve will not latch,
check for tripped overspeed
governor.
Adjust in accordance with Sect.
2-3, Para.34, F, (1), or replace
switch.
Check voltage at terminal (6,
Fig. 2) while operating start
switch (28, Fig. 1). If no voltage
is indicated, replace switch
(S24) or solenoid switch (L10)
as required.
Momentarily connect a large
size starter cable between
terminals 2 and 4, Fig. 2.
If the starter cranks the engine,
the solenoid (5, Fig. 2) is
defective. If the starter does not
crank the engine, the starter (1)
is defective. In either case,
replace starter and solenoid as
an assembly.
Chapter 3-1
Page 11