TUBE AS 3304050 - 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.
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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Identify all hydraulic lines as they are removed for reinstallation purposes. Cap and plug all lines and fittings to prevent any contaminants from entering the system.1. Release the pressure in the hydraulic system by slowly loosening the fill cap located on the top of the hydraulic oil tank.2. Park the machine on a solid level surface and move the leveling blade control to the float position. 3. Disconnect hose assemblies (1) from blade cylinder (2). Cap and plug immediately. 4. Remove nut and bolt (3). Repeat for the opposite end of the cylinder. Use two people to remove the cylinder. The weight of the cylinder is 27 kg (60 lb). For installation of the blade cylinder, reverse the removal steps.Disassemble & Assemble Blade Cylinder
Start by:a. remove blade cylinder 1. Remove two bolts (11), and slide cover (14) and rod assembly (10) partially out of cylinder assembly (12).2. Push head (5) into the cylinder assembly and remove lockwire ring (8).3. Remove head (5) and rod assembly (10) from cylinder assembly (12).4. Remove nut (1), piston (2) and head (5) from rod assembly (10). Remove O-ring seal (13) from the rod assembly. Check the O-ring seal for damage or wear and replace if necessary. During assembly, tighten nut (1) to a torque of 309 N m (227 20 lb ft).5. Remove wear ring (3) and O-ring seal (4) from piston (2). Check the wear ring and O-ring seal for damage or wear and replace if necessary.6. Remove O-ring seal (6) and back-up ring (7) from the outside of head (5). Remove lip-type seal (9), O-ring seal (15) and back-up ring (16) from inside head (5). Check the back-up rings, O-ring seals and lip-type seal for damage or wear and replace if necessary. During assembly of the steering cylinder, put a thin coat of clean oil on the O-ring seals, back-up rings and lip-type seal. For assembly of the steering cylinder, reverse the disassembly steps.End By:a. install blade cylinder