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SYMPTOM
Low engine oil pressure (oil
pressure indicator light ON,
Red STOP light flashing, and
alarm ON).
Engine overheats.
LeeBoy Model 695 Motor Grader
Table 5-3. Troubleshooting Chart (Cont.)
CAUSE
Low oil level.
Low viscosity (using winter oil in
summer).
Oil diluted with fuel.
Oil pressure sensor faulty.
Oil pressure control valve faulty.
Oil pump intake screen clogged.
Loose oil pump drive gear or worn
pump housing.
Internal engine component wear.
Low coolant level.
Loose, worn, or broken fan belt.
Worn pulley grooves, allowing belt
slippage.
Radiator dirty or clogged.
Radiator shroud missing or damaged.
Engine overloaded.
Radiator cap not sealing.
Fan on backwards or damaged.
Injection pump timing incorrect.
Excessive brake drag.
Hydraulic system overheating due to
internal leakage.
Thermostats stuck or missing.
Cooling system interior coated with
lime deposits.
Water pump leaking.
Excessive fuel delivery or injection
pump malfunctions.
Maintenance
REMEDY
Check oil level. Fill reservoir to correct
level. Check for leaks. Repair leaks.
Drain, flush, and fill reservoir with correct
weight oil.
Drain and refill reservoir with correct oil.
Check fuel system to find leakage and
repair leaks.
Replace oil pressure sensor.
Repair or replace valve. See your
authorized dealer.
See your authorized dealer.
See your authorized dealer.
Refer to Cummins engine manual.
Fill radiator with coolant to correct level
and check for leaks.
Tighten or replace fan belt. Refer to
Cummins engine manual.
Replace pulleys and belt. Refer to
Cummins engine manual.
Check airflow. Clean radiator and recheck
airflow.
Replace radiator shroud. Refer to
Cummins engine manual.
Reduce load. Operate in lower gear.
Replace radiator cap.
Inspect and reinstall or replace fan. Refer
to Cummins engine manual.
See your authorized dealer.
Refer to Cummins engine manual.
Check for clogged hydraulic oil cooler. See
your authorized dealer.
Replace thermostats. Refer to Cummins
engine manual.
Flush the cooling system with cleaner. Refill
with water/antifreeze solution.
Repair or replace water pump. Refer to
Cummins engine manual.
See your authorized dealer.
5 5
5-47
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