Reference
( 1 ) Preliminary Checks
Action:
Make the following checks before installing test equipment:
[1] – Ask Operator:
How is machine performing?
When does it malfunction?
In what applications?
[2] – Check maintenance records for:
Proper service intervals
Unusual, frequent or similar failures
[3] – If performing MFWD Preliminary Checks, check for:
Damaged or missing MFWD driveline
Other mechanical failures
[4] – Check hydraulic oil condition:
Is oil reservoir level low?
Possible causes:
Improper service intervals
External leaks
Is oil milky or dirty?
Possible causes:
Water in oil (milky)
Filter failure (dirty)
Metal particles (mechanical failure)
Is oil discolored or does it have burned odor (overheated oil)?
Possible causes:
Kinked pipes
Crushed hoses
Plugged oil cooler
Wrong oil viscosity
Internal leaks
Mechanical failure
[5] –
Check for external oil leaks, with engine stopped and again with engine running.
Result:
YES: Go to next check.
NO: Repair as needed and return to diagnosis in process.