"3072RT / 3772RT / 3772RT HD" Service & Parts Manual - ANSI Specifications March 2008
Page 4-7
PROBLEM PROBABLE CAUSE REMEDY/SOLUTION
Dual Fuel Engine - Gas
Starter inoperative Battery Cables loose or corroded
Key switch not functioning
Starter not functioning
Circuit board relay failed
Low gas level
Fuel valve closed - located at fuel tank
Clogged Fuel Filter
Faulty fuel selector switch
Faulty fuel shut off solenoid
Faulty fuel pump
Clean, tighten cables
Check power to wire #20 at Key switch while cranking
Check power to YEL/RED #220 wire at starter,
Check ground cable to engine bell housing
Check input on plug A pin-17, ORG/RED wire #20 on Lower
Controls circuit board
Check output on plug B pin-1, YEL/RED wire #220 on Lower
Controls circuit board.
12 volts in - 0 volts out = replace circuit board
Fill gas tank
Open valve
Replace fuel filter, located on fuel hose below engine
Check power to BLK/WHT wire #23 while cranking engine
Check power and ground at gas solenoid,
Check solenoid operation located in float bowl
Check power and ground at fuel pump during engine crank.
Check fuel pump operation
No Engine start:
Starter operates
continued…
Diesel Engine
Starter inoperative
No Engine start:
Starter operates
Engine starts but dies when
starter disengaged
Battery Cables loose or corroded
Key switch not functioning
Starter not functioning
Circuit board relay failed
Low diesel fuel level
Fuel valve closed - located at fuel tank
Air in injector lines
Fuel filter clogged
Run solenoid not activating
Glow plugs inoperative
Faulty oil pressure switch
Faulty Fuel solenoid
Clean, tighten cables
Check power to wire #20 at Key switch while cranking
Check power to YEL/RED #220 wire at starter,
Check ground cable to engine bell housing
Check input on plug A pin-17, ORG/RED wire #20 on Lower
Controls circuit board
Check output on plug B pin-1, YEL/RED wire #220 on Lower
Controls circuit board.
12 volts in - 0 volts out = replace circuit board
Fill diesel tank, (see
Section 3
for Fuel Priming instructions)
Open valve
See
Section 3
for Fuel Priming instructions
Replace fuel filter
Check power at WHT/BLK wire #320 from starter to run
solenoid while cranking (WHT/BLK pull in, GRN/WHT hold
wire)
See “
Glow Plugs Inoperative
” in this section
Check switch and wiring
Check 12 volts on GRN/WHT wire #116 -
Replace Fuel Solenoid
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