HOUSING 4663635 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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 or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: This machine is equipped with an electronic control module (ECM). The machine ECM contains the system diagnostics in order to detect faults. The diagnostics are displayed on the Caterpillar Monitoring System when the system is in the "Service Mode". Make sure that all faults are corrected before you troubleshoot the following problems.ReferenceFor additional information on the Electronic Control Module (Machine ECM), refer to System Operation, KENR8558, "Electronic Control Module (Machine ECM)".Some of the terms that are used for troubleshooting the machine are defined below.
Collapse is the sudden drop of an implement cylinder during normal operation.
Drift is the creeping of the implement cylinders while the control is in the HOLD position.
Droop is an initial movement of the hydraulic cylinders in the opposite direction of the selected lever position. The cylinders then move in the correct direction.Problem 1: The Blade moves while the control lever is in the HOLD position.Probable causes:
The control valve and the valve spool have excessive wear.
A piston seal in a cylinder has excessive wear.
There is a leak between the control valve and the cylinder that has drifted.
A check valve is not closing because of dirt or because of a worn seat.
The control valve is not centering correctly.
The control lever was not in the HOLD position when the engine start key was turned to the ON position. There