| Symptom | Problem | Solution |
|
Low Oil Pressure
| Low crankcase oil level |
Fill crankcase to proper
oil level.
|
| |
Faulty pressure sensor
|
Replace sensor. See
your John Deere engine distributor or servicing dealer.
|
| |
Clogged oil cooler or filter
|
Remove and inspect oil
cooler. See your John Deere engine distributor or servicing dealer.
|
| |
Excessive oil temperature
|
Remove and inspect oil
cooler. See your John Deere engine distributor or servicing dealer.
|
| |
Defective oil pump
|
Remove and inspect oil
pump. See your John Deere engine distributor or servicing dealer.
|
| |
Incorrect oil
|
Drain crankcase and
refill with correct oil.
|
| |
Oil pressure regulating valve failure
|
Remove and inspect oil
pressure regulating valve. See your John Deere engine distributor
or servicing dealer.
|
| |
Clogged oil pump screen or cracked pick-up tube
|
Remove oil pan and clean
screen/replace pick-up tube.
|
| |
Excessive main or connecting rod bearing clearance
|
Determine bearing clearance.
See your John Deere engine distributor or servicing dealer.
|
|
High Oil Pressure
| Improper oil classification |
Drain crankcase and
refill with correct oil.
|
| |
Faulty pressure sensor
|
Replace sensor. See
your John Deere engine distributor or servicing dealer.
|
| |
Oil pressure regulating valve failure
|
Remove and inspect oil
pressure regulating valve. See your John Deere engine distributor
or servicing dealer.
|
| |
Stuck or damaged filter bypass valve
|
Remove and inspect filter
bypass valve. See your John Deere engine distributor or servicing
dealer.
|
| |
Stuck or damaged oil cooler bypass valve
|
Remove and inspect
oil cooler bypass valve. See your John Deere engine distributor or
servicing dealer.
|
|
Excessive Oil Consumption
| Too low viscosity crankcase oil |
Drain crankcase and
refill with correct viscosity oil.
|
| |
Crankcase oil level too high
|
Drain oil until oil
level is correct.
|
| |
External oil leak(s)
|
Determine source of
oil leak(s) and repair as required.
|
| |
Oil control rings not seated
|
See your John Deere
engine distributor or servicing dealer.
|
| |
Oil control rings worn or broken
|
Replace piston rings.
See your John Deere engine distributor or servicing dealer.
|
| |
Scored cylinder liners or pistons
|
Remove and inspect cylinders
and liners; replace as required. See your John Deere engine distributor
or servicing dealer.
|
| |
Worn valve guides or stems
|
Inspect and measure
valve stems and valve guides; repair as required. See your John Deere
engine distributor or servicing dealer.
|
| |
Excessive oil pressure
|
See .
|
| |
Piston ring grooves excessively worn
|
Remove and inspect pistons.
See your John Deere engine distributor or servicing dealer.
|
| |
Piston rings sticking in ring grooves
|
Remove and inspect pistons.
See your John Deere engine distributor or servicing dealer.
|
| |
Insufficient piston ring tension
|
Remove and inspect pistons.
See your John Deere engine distributor or servicing dealer.
|
| |
Piston ring gaps not staggered
|
Remove and inspect pistons.
See your John Deere engine distributor or servicing dealer.
|
| |
Front and/or rear crankshaft oil seal faulty
|
Replace oil seals. See
your John Deere engine distributor or servicing dealer.
See earlier in this section.
|