LeeBoy 785 - TROUBLESHOOTING; ENGINE PROBLEMS

Section 4
MAINTENANCE
4-54
785 Motor Grader
TROUBLESHOOTING
GENERAL
The Troubleshooting Chart is based on identifying
a symptom, identifying the probable causes, and
identifying the remedy for the indicated symptom.
The causes listed are the most probable. If these
causes do not locate the problem a more detailed
analysis is required.
TROUBLESHOOTNG CHARTS
ENGINE PROBLEMS
SYMPTOM CAUSE REMEDY
Engine Won't Turn Over Master switch in OFF position Set switch to the ON position.
Ignition switch defective Check ignition switch.
Controls not in Neutral Check safety neutral switches.
Engine ground corroded Check engine ground wire.
Batteries undercharged Disconnect batteries and charge
separately. Replace both batteries if
one is dead.
Battery cable making poor contact Clean connections at battery and
starter solenoid. Check for 24 VDC at
large starter solenoid terminals.
Start Relay Listen for solenoid to "click" as key is
turned to start. If no "click" is heard,
relay or wiring needs repair or
replacement.
Starter solenoid Check for 24 VDC at small solenoid
terminal as key is turned to start. If
24 VDC is present, replace solenoid.
Key switch Check for 24 VDC at key switch "ST"
terminal with key in "start" position.
Starter motor Listen for starter solenoid "click" as
key is turned to "start". If "click" is
heard, starter motor may be
defective. Repair or replace.
Neutral start switch Replace switch.
See your authorized dealer.
Engine Won't Start-"Engine Low fuel level Check fuel in tank.
Contaminated fuel Drain fuel tank and refill.
Fuel flow cutoff Check fuel cutoff.
Fuel tank vent clogged Remove cap and listen for air
entering tank rapidly.
Fuel pump faulty Repair or replace pump.
Air filter element restricted Clean or replace filter element.
Injection pump faulty See your authorized dealer.
Injection nozzle(s) faulty See your authorized dealer.
Blown head gasket See your authorized dealer.
No voltage to injection transfer pump Check voltage to pump.
Engine flooded Turn off fuel valve under tank and
turn engine over until it cleans out the
cylinders and starts. When engine
starts, turn fuel valve on.
Turns Over"
(Starter Motor Will Not Turn)
Courtesy of Machine.Market