Hobart Jet-Ex 5D Operation And Maintenance Manual page 63

OM-2094 / Operation and Maintenance Manual
Jet-Ex 5D / Series 500285 / Generator Set
Engine and Controls (continued)
See section 2-4 for all figures referenced in this section.
Trouble, Symptom and Condition
4. Engine starts then stops when
ENGINE CIRCUIT toggle
switch S404 is released to
"ON" position.
5. Engine does not attain normal
idle RPM, or idles too fast.
6. Engine will not run at rated
speed (2450-2550 RPM)
November 1, 2000
Revised 03/01
Probable Cause
a. Open over temperature
switch S402 or defective
ENGINE CIRCUIT toggle
switch.
b. Choked fuel filter, restriction
in air cleaner, or air in fuel
system.
a. Loose throttle linkage
b. Defective full throttle
solenoid L403.
a. SPEED CONTROL toggle
switch S406 (10, Figure 4)
defective.
Test, Check, and Remedy
Place a clip-lead jumper wire on
the water temperature switch
terminals and check for normal
operating temperature. If engine
then starts properly, replace
water temperature switch. If not,
replace engine switch.
Check for these faults according
to instructions in the Engine
Manufactures User's Manual.
If solenoid core is pulled into the
full throttle solenoid L403 when
SPEED CONTROL toggle
switch S406 is in RATED RPM
position, check for loose control
rod between solenoid and
throttle. Tighten if required. If
solenoid core does not pull in,
proceed to the next step.
Check for l2-V-DC across two
terminals of solenoid when
S406 is in RATED RPM
position. If l2-V DC is measured,
but solenoid core does not pull
in, replace the solenoid.
If engine will not go from idle to
rated speed when SPEED
CONTROL toggle switch is in
RATED RPM position, turn off
engine and take resistance
measurements at SPEED
CONTROL toggle switch
terminals with switch in the
RATED RPM position.
Zero resistance should be
measured between terminals
having red-blue and orange
yellow wires. Replace speed
control switch if measurement is
improper.
Chapter 2-5
Page 3