TUBE-OIL SUCTION 3043698 - Caterpillar

Introduction
For further information of system operation, filling and timer setting procedure, reference "Operation & Maintenance Manual" SEBU6762. For further information of electrical system, reference "Electrical Schematic", SENR6144 (6XK115-UP) or SENR1903 (6NK156-UP and 9WL132-UP).Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "TOOLS AND SHOP PRODUCT GUIDE, NENG2500", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates.The Automatic Lubrication System (Auto Lube) consists of the electrical system, pump assembly, metering devices and lubrication distribution lines.The Auto Lube System automatically lubricates the attachment linkage pins and the swing bearing at an optimum interval. The variable lubrication interval time is one hour to 15 hours with a continual pump operating time of two to 30 minutes. The pump is activated when the engine start switch is in the ON position. The pump can be manually activated by pressing either of the pump start switches on an as-needed basis or to test the pump.Pump operation
Pump Assembly
(1) Reservoir. (2) Wiper blade. (3) Filler fitting. (4) Housing. (5) Outlet line. (6) Relief valve. (7) Pump element.
Hydraulic schematic
(1) Reservoir. (2) Wiper blade. (3) Filler fitting. (4) Housing. (5) Outlet line. (6) Relief valve. (7) Pump element. (12) Check valve. (17) Electrical motor.
Pump (Charging stage)
(7) Pump element. (8) Eccentric. (9) Piston. (10) Spring. (11) Valve seat. (12) Check valve. (13) Passages. (14) Piston chamber. (16) Spring.The electric motor (17), pump element (7) and eccentric (8) are located in housing (4). The electric motor (17) causes wiper blade (2) and eccentric (8) to rotate clockwise. Wiper blade (2) forces lubricant from the reservoir (1) to pump element (7). When pump element (7) is in the charging stage, piston (9) is shifted to the left by the force of spring (10). Spring (16) forces check valve (12) against valve seat (11). Lubricant is forced by wiper blade (2) thru passages (13) and into piston chamber (14).
Pump (Delivery stage)
(7) Pump element. (8) Eccentric. (9) Piston. (10) Spring. (12) Check valve. (14) Piston chamber. (15) Discharge chamber. (16) Spring.As eccentric (8) continues to rotate clockwise, piston (9) is forced to the right compressing spring (10). The lubricant in piston chamber (14) forces check valve (12) to the right compressing spring (16). This opens a passage between piston chamber (14) and discharge chamber (15). Lubricant is forced out of discharge chamber (15) and into outlet line (5) at a rate of 2.4 cc/min at 1000 kpa (1450 psi). Relief valve (6) limits system pressure to 35 000 kPa (5075 psi). If lubricant is leaking at relief valve (6), it indicates that one of the metering devices or delivery lines is restricted. See "Troubleshooting" section in this module.Metering devices
Lubrication system (6XK115-UP)
(1) Pump assembly. (2) Main line. (3) Main metering device. (4) Secondary metering devices.
Lubrication system (6NK156-UP