AIR COMPRESSOR GP 3850939 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Scheduled Oil Sampling (S O S) Analysis
For the 3408 deep sump engines and for the 3412 engines, this maintenance can be performed Every 500 Hours.Obtain Sample and Analysis
To compliment a good preventive maintenance program, Caterpillar recommends using S O S oil analysis at regular scheduled intervals to monitor the condition and maintenance requirements of your engine.Each oil sample should be taken when the oil is warm and well mixed to ensure that the sample is representative of the oil in the crankcase.
Typical oil sampling valve.To obtain S O S samples:* Use the oil sampling valve (if equipped)* Use a sampling gun inserted into the sump* Use the drain stream when changing oilCaterpillar recommends using the first or second method. If these methods are not feasible, then use the drain stream method. When using the drain stream method to obtain the oil sample, do not sample from the first or final draining. The oil at the beginning or end of the drain stream is not mixed well enough to be representative of the oil in the crankcase.Consult with your Caterpillar dealer for complete information and assistance in establishing an S O S program for your engine.Engine Crankcase
For the 3408 deep sump engines and for the 3412 engines, this maintenance can be performed Every 500 Hours.This maintenance should be performed on as level a surface as possible.Replace Oil and Filter(s)
Do not drain oil when the engine is cold. As oil cools, suspended waste particles settle on the bottom of the crankcase or oil pan. The waste particles are not removed with the draining cold oil. Drain the crankcase with the engine stopped and the oil warm. This allows for the draining of the waste particles that are suspended in the oil.Failure to follow this recommended procedure would result in these waste particles being recirculated through your engine lubrication system with the new oil.Drain Oil
Do not allow the oil to drain into the bilge sump.
After the engine has been run at normal operating temperature, STOP the engine. The method you use to drain your engine's crankcase oil depends on your engine equipment.* If equipped with a drain valve, turn the valve knob counterclockwise (CCW) to drain the oil. After the oil has drained, turn the valve knob clockwise (CW) to close the drain.* If not equipped with a drain valve, remove the oil drain plug(s) and allow the oil to drain. After the oil has drained, clean the oil drain plug(s). Clean the oil drain plug fitting(s). Install the oil drain plug(s). Tighten the plug(s) to 80 11 N m (60 8 lb ft).* If a sump pump is used: 1. Connect a suitable drain line to the pump outlet. Ensure that the oil will drain into a suitable container.2. With the engine stopped and the oil warm, open the sump pump valve to the