Komatsu D37EX-24 Operation & Maintenance Manual page 274

TROUBLES AND ACTIONS
Problem
Even if the joystick (steering, direc-
tional and gear shift lever) is operat-
ed, machine does not move off.
Only one side of track shoe moves.
Machine deviates without steering
operation.
Hydraulic oil gets overheat. (Pointer
is in red range.)
PHENOMENA AND ACTIONS FOR ENGINE RELATED PARTS
• Contact your Komatsu distributor for the remedies indicated with (*) in the remedy column.
• Ask your Komatsu distributor for repairs for problems or causes which are not listed below.
Problem
After warming up, when engine
speed is increased, engine oil pres-
sure caution lamp still lights up.
3-216
Main causes
Parking lever is in LOCK position.
Charge pump is worn or scuffed.
Brake release solenoid does not op-
erate.
Defective joystick (steering, direction-
al and gear shift lever)
Fan is set in reverse mode.
Turbo protect function in operation
HST pump is defective.
Electrical system is defective.
Defective joystick (steering, direction-
al and gear shift lever)
Defective HST pump and motor
Defective motor speed sensor
Hydraulic oil temperature is low.
Air is mixed in hydraulic circuit.
Work load is too large.
Work equipment is relieved.
Continuous high-speed travel
Clogged oil cooler fins or damaged
fin
Main causes
Insufficient oil in engine oil pan (suck-
ing in air)
Improper oil is used. (Viscosity is im-
proper.)
Clogged oil filter cartridge
Oil leakage due to defective tighten-
ing or breakage of oil pipe or pipe
joint.
Defective monitor
Remedy
Set to FREE.
Check, replace. (*)
Check, repair, replace. (*)
Check, replace. (*)
Set it to normal rotation mode.
Wait until operation finishes.
Check, replace. (*)
Check, repair, replace. (*)
Adjust, check, repair. (*)
Adjust, check, repair, replace. (*)
Adjust, check, replace. (*)
Warm-up.
Bleed air. (*)
Lighten the work load to prevent trav-
el relief.
Avoid operating the blade to the
stroke end of cylinder.
Drive in lower speed range.
Clean or repair. See WHEN RE-
QUIRED.
Remedy
Add oil to specified level. See
CHECKS BEFORE STARTING.
Referring to "RECOMMENDED
FUEL, COOLANT, AND LUBRI-
CANT", replace oil with proper one.
Replace. See EVERY 500 HOURS
MAINTENANCE.
Check and repair. (*)
Replace. (*)
OPERATION