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| Illustration 1 | g00551635 |
Oscillating axle cylinder (1) Cylinder (2) Spring (3) Guide (4) Tappet (5) Oil passages (6) Port (7) Cushion (8) Spring (9) Piston (10) Bleeder port (11) Ball (12) Cylinder piston | |
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| Illustration 2 | g00551636 |
Oscillating axle cylinder (1) Cylinder | |
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| Illustration 3 | g00551637 |
Oscillating axle accumulator (13) Accumulator | |
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| Illustration 4 | g00821212 |
The two oscillating axle cylinders are mounted on the left and right sides of the undercarriage chassis above the steering axle. A check valve is built into each cylinder.
The oscillating axle cylinders can be operated via the oscillating axle/operating brake valve on the left console. Pilot pressure from the oscillating axle/operating brake valve will shift the check valves in the cylinders.
When the oscillating axle/operating brake valve lever is in position II, the oscillating axle cylinders are locked and wheel brakes released. In this valve position, no pilot pressure is applied to the check valves. The check valves lock and the check valves hold the cylinders in the respective position.
Moving the oscillating axle/operating brake valve lever to position I releases the wheel brakes. This unlocks the oscillating axle cylinders for travel. Pilot pressure of 3000 to 3200 kPa (435 to 465 psi) goes from the oscillating axle/operating brake valve to port (6). The pilot pressure unlocks the check valves in order to allow oil flow. The cylinder pistons are free to float with the axle.
Oscillating Axle Cylinders with Check Valves Locked
When the oscillating axle/operating brake valve is in position II, ports (6) of the oscillating axle cylinders have no pressure. The pilot pressure is reduced by the oscillating axle/operating brake valve through port "T". As a result, piston (9) is moved with tappet (4) against the stop by the force of spring (2) .
Due to the return stroke of tappet (4), ball (11) is moved by the force of spring (8). The remaining pressure from piston movement in the oscillating axle cylinders blocks return flow through the check valve. As oil flow is now blocked, pistons (12) in the oscillating axle cylinders are locked.
Any excessive pressure or vacuum that results from the stroke of piston (9) is equalized through bleeder port (10) .
Oscillating Axle Cylinders With Check Valves Unlocked
When the oscillating axle/operating brake valve is in position I, pilot oil is sent through the line that is connected to port (6). This unlocks the oscillating axle cylinders and the check valves.
The pilot oil that is received through the port goes through oil passages (5) to piston (9). The pressure that is applied to the surface area of the piston moves with tappet (4) against the force of spring (2). The tappet pushes ball (11) out of the valve seat against the force of spring (8) and against the pressure from the cylinder. The check valve is now open and pilot oil is free to flow to the pistons of the oscillating axle cylinders.
The two oscillating axle cylinders are connected to each other by oil passages. Since the pilot pressure keeps the check valves open, the axle can oscillate and the oil can flow between the cylinders.