2. Current limit (C/L) circuit has a defect: Make test to the MicroController control panel as stated in the respective service module. Repair or replace components as necessary. 8. Loose or worn side bearings. 9. Noise in the drive wheel reduction components. 3. Unpolished or improperly positioned forks: Install tapered and polished forks. Position forks correctly for load being lifted. Problem 2: Noise at different intervals. Probable Cause: 4. Lift truck equipped with tires that have poor traction: Install tires that have good traction per recommendation from DAEWOO Inc. 1. Bevel gear does not run evenly. a. Nut on drive gear not tightened correctly. b. Drive gears have a defect (warped).
5. Lift truck work load is too heavy or the duty cycle too long: Decrease the work load and/or duty cycle. 2. Loose or broken bearings. 3. Failure of or not enough lubricant on the drive wheel reduction components. Problem 10: Lift truck has slow acceleration: Problem 3: One drive wheel does not turn (motor operates). Probable Cause: Probable Cause: 1. Drive control overheated and the thermal switch opens: 1. Broken axle shaft. a. Loose wheel bearings. b. Loose flange studs or nuts. c. Bent housing. NOTE: The lift truck will still go into the bypass mode, but current limit will be cut back in the transistor mode if the thermal switch opens.
Allow the MicroController control panel to become cool so the thermal switch will close. 2. Pinion gear teeth have damage. NOTE: The thermal switch will open circuit if the temperature is 150 L 6ЎC (302 L 11ЎF) and reclose (short circuit) at 130 L 7ЎC (266 L 13ЎF). 3. Bevel gear, pinion or gears broken. Problem 4: Leakage of lubricant. Probable Cause: Power Transfer Group and Final Drive 1. Loss through axle shafts. a. Lubricant above specified level. b. Wrong kind of lubricant. c. Restriction of axle housing breather. d. Axle shaft oil seal installed wrong or has damage. Problem 1: Constant noise in drive axle housing. Probable Cause: 1. Lubricant not to the specified level. 2.
Wrong type of lubricant. 2. Loss at pinion. a. Lubricant above specified level. b. Wrong kind of lubricant. c. Restriction of axle housing breather. d. Drive motor seal worn or not installed correctly. 3. Wheel bearings out of adjustment or have a defect. 4. Bevel gear and pinion not in adjustment for correct tooth contact. 5. Teeth of bevel gear and pinion have damage or wear. 6. Too much or too little pinion to bevel gear clearance (backlash). 7. Loose or worn drive motor bearings. Power Train Testing And Adjusting 13