BEARING-THRUST 8N7929 - Caterpillar

Important! Please Read
When working on or around air brake systems and components, the following precautions should be observed:1. Always block vehicle wheels. Stop engine when working under a vehicle. Depleting vehicle air system pressure may cause vehicle to roll. Keep hands away from chamber push rods and slack adjusters; they may apply as system pressure drops.2. Never connect or disconnect a hose or line containing air pressure. It may whip as air escapes. Never remove a component or pipe plug unless you are certain all system pressure has been depleted.3. Never exceed recommended air pressure and always wear safety glasses when working with air pressure. Never look into air jets or direct them at anyone.4. Never attempt to disassemble a component until you have read and understand recommended procedures. Some components contain powerful springs and injury can result if not properly disassembled. Use only proper tools and observe all precautions pertaining to use of those tools.General
The function of the air compressor is to build up and maintain the air pressure required to operate air powered devices in air brake or air auxiliary systems.Description
Figure 1 - Flange Configurations
Figure 2
Figure 3The Tu-Flo 600 is a two cylinder reciprocating single stage compressor with a rated displacement of 14.5 cfm at 1250 rpm.The Tu-Flo 600 is constructed with a crankcase, block, and head assembly. The crankcase assemblies, in particular, are essentially the same as corresponding Tu-Flo 500's. The block assembly includes the air inlet cavity, automatic inlet valves and unloader valves. Vertical mounting pads for governor mounting are included at each end of the block. The head assembly includes the discharge valves with discharge ports either on the side or top of the block.All Tu-Flo 600's are liquid cooled, both head and block, by coolant from the engine cooling system.Various mounting and drive configurations are used as required by different vehicle and engine designs. Fig. 1.All Tu-Flo 600 compressors receive oil under pressure from the engine lubricating system for the lubrication of the internal parts. Fig. 2 shows a cross section of a typical Tu-Flo 600 compressor and the oil flow therein.Oil is forced through the oil passage in the crankshaft to each connecting rod journal. Oil is forced out at the journals and is thrown by centrifugal force against the cylinder walls and crankshaft main bearings, providing lubrication.The wrist pins and wrist pin bushings are lubricated in two ways depending on the type connecting rod used. Some older compressors, and one current design use forged steel rifle drilled rods, through which oil is forced to the wrist pin bushings. Standard current design consists of a diecast aluminum or forged steel rod with an "oil catch-funnel" at the top of the rod and a short hole connecting to the wrist pin bushing. See Fig. 3.Name Plate
A name plate is attached to the crankcase of all compressors. It shows the piece number, type and serial number (Fig. 4). A name plate with a black background denotes a new compressor, whereas a name plate