SEAL-LIP TYPE 1W4123 - Caterpillar

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 Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide"for tools and supplies to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations.
When the disabled machine's engine is stopped, perform the following steps before you tow the machine.
Engage the parking brake and chock the wheels.
Illustration 1 g00415378
Reverse the hydraulic steering hose connections on one cylinder only.
Ensure that the pump has cooled before performing the procedure.
Illustration 2 g00720361
Activate the bypass mode of the crossover relief valves in order to allow free circulation of the oil while the machine is being towed.Note: There are two types of relief valves that can be used for this application. The two types of relief valves have different adjustments for activating the bypass mode. An instruction for each type of relief valve is provided at the end of this section. Be sure to use the correct instruction for the type of relief valves on your machine.
Secure the tow bar to the disabled machine.
Remove the wheel blocks and release the parking brake.Note: Do not tow the machine faster than 2.0 km/h (1.2 mph).
Release the parking brake to prevent excessive wear and damage to the parking brake system, when towing the machine.The procedure for manual release of the parking brake is outlined in the next topic, Parking Brake Manual Release.
After towing is complete, deactivate the bypass mode for the crossover relief valves and tighten the valves to the specified torque. The torque specifications are provided at the end of this section.
Reconnect the hydraulic steering hose connections that were reversed in Step 2.Note: Ensure that the hydraulic steering hoses are connected correctly before operating the machine. The steering system will not function when the hoses are reversed.
Personal injury or death can result from a brake malfunction.Be sure all necessary repairs and adjustments have been made before a machine that has been towed to a service area, is put back into operation.
Activating the Bypass Mode for the Crossover Relief Valves on Machines with the 152-9143 Relief Valves
Illustration 3 g00720142
Remove the protection cap (1) from the 152-9143 Relief Valves. See Illustration 3.
Unscrew hex head screw (2) on both of the relief valves. This will release the valve cartridge, which allows free circulation of the oil during towing.Note: Do not adjust the external hex nut (3). This is the locking nut for set screw (5), which is the adjustment for the relief pressure setting. Any adjustment of the hex nut can loosen the hex head screw (2). This can result in changes to the relief pressure setting and in activation of the bypass mode. If adjustments are made to the relief pressure setting with the hex nut (3), always check in order to ensure that the hex head screw (2) is tightened to the correct torque. See