SPINDLE AS 4151852 - Caterpillar

Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.In order to prevent possible injury, perform the following procedure before testing and adjusting any of the machine hydraulic systems.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Reference: Refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced before performing the following procedure.
Move the machine to a smooth, level surface. Move the machine approximately ten feet in the forward direction. Then, move the machine approximately ten feet in the backward direction. Park the machine. Connect the steering frame lock so that the machine can not articulate. Power down the lift linkage in order to raise the front wheels off the ground. Then, raise the lift linkage in order to lower the front wheels to the ground. Lower the bucket to the ground.
Turn the engine start switch to the OFF position.
Engage the parking brake. Place blocks in front of the wheels and behind the wheels.
Move the steering transmission integrated control (STIC) several times through the full range of motion in order to relieve the pilot pressure in the steering system. If you are servicing the steering cylinders, the steering valve, or the steering hoses, slowly crack the lines in order to purge any trapped oil that may be in the steering system. Note: The 836H Landfill Compactor may be equipped with either STIC steering or wheel steering.
Depress the service brake pedal repeatedly. This will purge any hydraulic oil pressure in the brake system.
The machine is equipped with electrohydraulic controls. Before moving the control levers, turn the key start switch to the ON position. Move the implement control levers through the full range of travel. This will release most of the hydraulic oil pressure in the implement hydraulic system. Place the control levers in the HOLD position. There may be some pressure that is trapped in the tilt circuit. Relieve this pressure before servicing the implement hydraulic system. To relieve this pressure, slowly crack the hydraulic lines to the tilt circuit. This will remove any trapped oil pressure in the tilt circuit.
Turn the key start switch to the OFF position.
Illustration 1 g00831760
Location of breaker relief valve
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