WRENCH A 5P4756 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the implement hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed.
2. Release the pressure in the implement hydraulic system as follows:a. Fully retract the rod in the stick cylinder.b. Adjust the position of the bucket so that it will be flat on the ground when the boom is lowered.c. Lower the boom until the bucket is flat on the ground.d. Shut off the engine.e. Check the pilot pressure at the implement pilot system test port at the pilot manifold assembly under the cab. If the pressure is below 3000 kPa (435 psi) connect an auxiliary pump unit to this port and pump the pilot pressure to 4000 kPa (580 psi).f. Put the hydraulic activation control lever in the "Unlock" position and turn the start key to RUN. DO NOT START THE MACHINE.g. Move the control levers for boom, bucket, stick and swing to all full stroke positions and actuate both bottom dump trigger switches (if so equipped) on the front of the control handles. This should release any pressure that might be present in the main implement system. Disconnect the auxiliary pump unit (if used) and install the pressure gauge at the test port. Continue to move the control levers until the pilot system pressure is released. Verify the pilot system pressure is released with the pressure gauge.h. Press the relief valve button on the hydraulic tank breather to release the tank pressure.i. The pressure in the system has been released and lines and components can be removed or disconnected.
Typical Example The track tension relief valve is located inside the track roller frame next to the track tension accumulator.3. Manually release the track tension as follows: a. Remove plug (1) from track tension relief valve (4).b. Turn track tension manual release valve (2) counterclockwise. This will allow ball (3) to move and release pressure in the track tension cylinder and track tension accumulator. 4. Disconnect hose assembly (6) from track tension cylinder (5).5. Fasten a hoist to track tension cylinder (5). Remove bolts (7) and remove the track tension cylinder. The weight of the track tension cylinder is approximately 365 kg (800 lb). The following steps are for the installation of the track tension cylinder.6. Position track tension cylinder (5) in the track roller frame. Install bolts (7) that hold it. Install hose assembly (6).7. Tighten track tension manual release valve (2) and install plug (1) on the track tension relief valve.8. Check the oil level in the hydraulic oil tank. Fill the hydraulic oil tank to the correct level. Refer to the Operation & Maintenance Manual for the correct capacity and fluid.Disassemble & Assemble Track Tension Cylinders
Fluid Spillage ContainmentCare 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