- unstable engine operation;
- incorrect adjustment;
- malfunction of the hydraulic system;
- mechanical failures.
Troubleshooting should always begin with checking easy-to-repair items and adjustment parameters such as fluid level and condition, shift linkage and throttle linkage adjustment. Then carry out a road test to determine if the problem has been corrected or if further diagnosis is required. If the fault persists after completion of the preliminary tests, additional diagnostics must be carried out in a specialized workshop.