Troubleshooting
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Below are some basic tips and pointers to help you get moving but don’t forget the original machine manufacturers procedures should be followed where available.
When things go wrong.
External problems
Just because your final drive is weak or won’t move doesn’t necessarily mean the cause of the fault is with the drive. Even if there is damage to the gearbox or motor that damage could be the symptom of a fault elsewhere on the machine.
Here are some things to look for:
- Is there sufficient oil in the hydraulic oil tank?
- Does the engine run at full speed?
- Are the tracks too tight?
- Is the machine stuck in high speed mode?
- Are the tracks, track rollers and idlers in good condition?
- Is the machine delivering the correct oil pressure, and flow, to the track motors?
- Are there any internal leakages in the swivel joint?
- Is there back pressure, or a blockage in the motor case drain line?
Tip: Don’t run a repaired or replacement drive unless you are certain you understand the reason for the original failure—and have rectified the fault.
Final drive problems
Work through the chart below to help to define the problem.
| Symptom | Problem | Possible Cause | Solution | |
| Oil Leak | Oil leaking from gearbox cover | 1 | Distorted gearbox cover or casing caused by physical damage | Replace the cover and cover o-ring, have the casing machined to remove distortion |
| 2 | Pressure build-up in gearbox caused by motor or external problem | Contact the FDC service Centre | ||
| Oil leaking from behind the sprocket | 1 | Damaged or worn floating (lifetime) seal | Replace the floating seal | |
| 2 | Pressure build-up in gearbox caused by motor or external problem | Contact the FDC service Centre | ||
| Gearbox oil level too high | Hydraulic oil leaking from the motor into the gearbox | 1 | Worn motor shaft oil seal or bearings | Replace accordingly |
| 2 | Excessive pressure in motor casing | External problem | ||
| Excessive noise | Insufficient oil in gearbox | Gearbox oil leak or lack of maintenance | Gearbox / motor requires overhaul | |
| Worn bearings or gears | Gearbox / motor has reached the end of its planned service life or failed through a lack of maintenance | Replace drive with new or reconditioned unit from the Final Drive Centre. | ||
| Excessive vibration | Sprocket loose | Sprocket bolts loose | Tighten or replace bolts | |
| The gearbox ‘shudders’ while turning | Gearbox / motor has reached the end of its planned service life or failed through a lack of maintenance | Gearbox / motor requires attention / overhaul | ||
| Excessive heating | Gearbox casing is hot to touch or steams when wet | 1 | No oil | Add oil |
| 2 | Worn Bearings | Gearbox requires overhaul | ||
| 3 | Brake does not release properly | Check brake operating pressure and brake piston seals | ||
| 4 | Hydraulic oil excessively hot | Check oil cooler & hydraulic system | ||
| Machine will not climb steep gradient or steers to one side | Lack of power | 1 | Hydraulic pressure low | Check hydraulic pressure at the travel motor |
| 2 | High external friction | Check track chain tension and condition of track rollers and idlers | ||
| 3 | Travel motor stuck in fast mode | Check speed control system | ||
| 4 | Travel motor excessively worn | Repair or replace travel motor | ||
| 5 | Gearbox excessively worn | Repair or replace gearbox | ||
| Drive does not turn | Motor works but not driving gearbox | Motor shaft or 1st sun gear broken | Replace both motor shaft and 1st sun gear (with coupling if required) | |
| Nothing turns | 1 | Gearbox / motor has reached the end of its planned service life or failed through a lack of maintenance | Contact the FDC service Centre | |
| 2 | Brake does not release | Check braking system if external brake control fitted | ||
| 3 | Check brake piston seals if internal brake is fitted | |||
| Drive freewheels | Brake does not function | 1 | Residual; pressure in circuit | Check hydraulic system |
| 2 | Worn brake discs | Replace discs | ||
| 3 | Broken motor shaft | Replace motor shaft |
