Operational Checks
The operation checks can be used to find leakage in the system. Also, the operation checks can be used to find a failed valve or a failed hydraulic and steering pump.
The oil in the hydraulic system must be at an operating temperature of 46 to 52°C (115 to 125°F).
Extend the implement cylinders and retract the implement cylinders several times. Allow the implement cylinders to travel full stroke in each direction.
- Watch the cylinder as the cylinder is extended and retracted. The movement of the cylinder must be smooth and regular.
- Listen to the hydraulic and steering pump for noise.
- Move each control valve into the HOLD position while the implement is off the ground. Watch for cylinder rod drift. If the cylinder moves more than 19.0 mm (.75 inch) in 60 minutes, then the cylinder drift is excessive.
Implement cylinder drift is caused by oil leakage in the following components:
- Cylinder piston seals
- Line relief valves
- Lock valve in the implement control valve
- Ball valve in the auxiliary circuit
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