LeeBoy 685D - Page 139

SYMPTOM CAUSE REMEDY
Engine emits
excessive black or
gray exhaust smoke.
Restricted air lter element. Clean or replace air lter elements.
Wrong grade of fuel.
Use only ULSD (Ultra-Low Sulfur Diesel) fuel with
a maximum sulfur content of 15 ppm (parts per
million).
Engine overloaded. Remove load. Run at fast idle to clear the engine.
Turbocharger gasket leak. Repair or replace. See your authorized dealer.
Incorrect injection pump timing. Repair or replace. See your authorized dealer.
Excessive fuel deliver. Injection pump
or nozzle malfunctions.
See your authorized dealer.
Engine emits
excessive blue or
white exhaust smoke.
Wrong grade of fuel.
Use only ULSD (Ultra-Low Sulfur Diesel) fuel with
a maximum sulfur content of 15 ppm (parts per
million).
Injection pump or nozzle malfunctions. See your authorized dealer.
Excessive oil consumption due to
engine malfunction.
Refer to your Engine Owner’s Manual.
Engine overheats.
Low coolant level. Rell radiator with correct coolant.
Loose, worn or broken fan belt. Tighten or replace.
Worn pulley grooves allowing engine
belt slippage.
Replace belt and pulleys. Refer to your Engine
Owner’s Manual.
Radiator dirty or clogged. Clean or replace.
Radiator shroud missing or damaged. See your authorized dealer to replace shroud.
Engine overloaded. Reduce load. Operate in low gear.
Radiator cap doesn’t seal. Replace radiator cap.
Fan damaged. Replace fan.
Injection pump timing incorrect. See your authorized dealer.
Hydraulic system overheating due to
internal leakage.
Check for clogged hydraulic oil cooler. See your
authorized dealer.
Thermostats stuck (or missing). Replace thermostats.
Interior of cooling system coated with
lime deposits.
Flush the cooling system with cleaner. Rell with
water and antifreeze solution.
Water pump leaking. Repair or replace pump.
Excessive fuel delivery or injection
pump malfunctions.
See your authorized dealer.
Steering is difcult.
Low hydraulic uid level. Add hydraulic oil.
Hydraulic tank return lters contain
contamination.
Check lters for contamination and clean or
replace.
Steering motor priority relief valve set
incorrectly.
Check relief valve setting. Check relief valve
setting. It should be 2200 PSI. Adjust setting if
necessary.
Worn hydraulic pump. Repair or replace.
Worn steering orbital motor. Repair or replace.
Worn steering cylinder. Repair or replace.
5
Maintenance
LeeBoy 685D Motor Grader 5-47