Drivetrain Troubleshooting Checklist

Drivetrain
Troubleshooting Checklist

Below are a
few Troubleshootings listed:

1. Abnormal Wear/Debris Checks
	Check magnetic drain plug for particles and examine.
	Check magnetic screens.
	Drain oil through a fine cloth or sleve.
	Drain oil and flush if necessary to clear system.
	Check operation of system (e.g. Noise, vibration, oil pressure etc.)
	Thief sample drawn from bottom of the sump.
	Not sampled hot and midstream at drain (see sampling instructions.)
	Check correct oil level is being maintained.
	Check correct oil grade is being used.
	Lack of/excessive particles can result from cold sampling procedure as oil is not well mixed.
	Debris could come from a previous failure or an accumulation of wear particles.
	Check shaft alignment.
	Check diff lock operation.
	Oil pump not operating.
	Extended lubricant use.
	Check for misalignment of drive train.
	Check tyre diameters are the same size.

2. Dirt and Water Checks
	Check for leaking oil seals.
	Check for damaged or missing breathers.
	Loose cover plates or linkage boots/seals damaged.
	Oil storage or top-up containers/funnels dirty.
	Dirt entering when unit filled or topped up with oil.
	Pressure cleaning procedure introducing water or dirt.
	Condensation due to low operating temp or blocked breather.
	Oil cooler leaks.
	Check sampling technique.
	Recent overhaul/rebuild.

3. Overheating Checks
	Sump overfull.
	Heat transfer (e.g. Binding brakes.)
	Low oil level.
	Unit caked with dirt.
	Oil cooler blocked or restricted.
	Incorrect oil grade.
	Overload conditions.
	Shaft misalignment.
	Localised high temperature due to wear problem.
	Diff lock left engaged for extended periods.

Clean Oil
System Troubleshooting Checklists

1. Abnormal wear/debris checks
	Check oil filter for particles and examine.
	Drain oil through a fine cloth or sleve.
	Sample taken from filter bowl (incorrect sampling method).
	Drain oil and flush if necessary to clear system.
	Check operation of system (e.g. Noise, vibration, oil pressure etc.)
	Debris could come from a previous failure or an accumulation of wear particles through extended lubricant use.
	Not sampled hot and midstream at drain (see sampling instructions).
	Lack of/excessive particles can result from cold sampling procedure as oil is not well mixed.
	Check magnetic screens.
	Oil pump not operating.
	Thief sample drawn from bottom of the sump (incorrect sampling).
	Carry our stall test and check for knocking at stall speed (transmission).

2. Overheating Checks
	Incorrect oil grade.
	Sump overfull.
	Low oil level.
	Unit caked with dirt.
	Oil cooler blocked or restricted.
	Localised high temperature due to wear problem.
	Overload conditions.

3. Dirt and water checks.
	Check sampling technique.
	Check for leaking oil seals.
	Loose cover plates or linkage boots/seals damaged.
	Dirt entering when unit filled or topped up.
	Recent overhaul/rebuild.
	Oil storage or top-up containers/funnels dirty.
	Oil cooler leaks.
	Pressure cleaning procedure introducing water and dirt.
	Condensation due to low operating temperature or blocked breather.
	Water traps not functioning or breather blocked (compressor).
	Check of damaged or missing breathers.
	Check oil filter for by-pass operation.