LADDER AS 1409189 - Caterpillar

Do not operate the engine with low oil pressure. Engine damage will result. If measured oil pressure is low, discontinue engine operation until the problem is corrected.
Probable Causes
Engine oil level
Oil specification
Engine oil pressure gauge
Engine oil filter
Piston cooling jets
Engine oil suction tube
Engine oil pump
Bearing clearanceRecommended Actions
Engine Oil Level
Inspect the engine oil level. If necessary, add oil.
If the fault is still apparent, refer to "Oil Specification". Oil Specification
Make sure that engine oil of the correct specification is used. Refer to the Operation and Maintenance Manual, "Lubricant Specifications".
If necessary, drain the oil system and refill the oil system with engine oil of the correct specification. Refer to Operation and Maintenance Manual, "Engine Oil and Filter - Change".
If the fault is still apparent, refer to "Engine Oil Pressure Gauge". Engine Oil Pressure Gauge
Check the actual engine oil pressure with a calibrated test gauge. Compare the oil pressure reading from the electronic service tool to the pressure on the test gauge.
If no difference is noted between the indicated oil pressures, refer to "Engine Oil Filter". Engine Oil Filter
Remove the engine oil filter. Refer to the Operation and Maintenance Manual, "Engine Oil and Filter - Change".
Inspect the engine oil filter for evidence of blockage.
Install a new engine oil filter. Refer to the Operation and Maintenance Manual, "Engine Oil and Filter - Change".
If the fault is still apparent, refer to "Piston Cooling Jets". Piston Cooling Jets
Inspect the piston cooling jets for damage. Replace any piston cooling jet that appears to be cracked, broken or missing. Refer to Disassembly and Assembly, "Piston Cooling Jets - Remove and Install".
If no damage is found, refer to "Engine Oil Suction Tube". Engine Oil Suction Tube
Check the inlet screen on the oil suction tube and remove any material that may be restricting oil flow.
Check the joints of the oil suction tube for cracks or a damaged joint that may allow air leakage into the supply to the oil pump.
If no faults are found, refer to "Engine Oil Pump". Engine Oil Pump
Inspect the components of the engine oil pump for excessive wear. Repair the oil pump or replace the oil pump, if necessary. Refer to Disassembly and Assembly, "Engine Oil Pump - Remove", Disassembly and Assembly, "Engine Oil Pump - Install" and Disassembly and Assembly, "Engine Oil Relief Valve - Remove and Install".
If no faults are found, refer to "Bearing Clearance". Bearing Clearance
Inspect the engine components for excessive bearing clearance or damaged bearings. If necessary, replace the bearings and/or the components. Inspect the following components for excessive bearing clearance:
Crankshaft main bearings
Connecting rod bearings
Camshaft front bearing
Idler gear bearing