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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
- The control valve and the valve spool have excessive wear. There may be dirt or the return spring may be broken.
- A piston seal in a cylinder has excessive wear.
- There is a leak between the control valve and the cylinder that has drifted.
- A check valve is not closing because of dirt or because of a worn seat.
- The control valve is not centering correctly.
- The lever position sensor is faulty.
Note: Care must be taken in order to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. You must be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component that contains fluid. Dispose of all fluids according to local regulations.
Refer to Testing and Adjusting, "Operational Checks (Hydraulic System)" in this manual.
A Piston Seal In An Implement Cylinder Has Excessive Wear
Refer to Testing and Adjusting, "Operational Checks (Hydraulic System)" in this manual.
There Is A Leak Between The Control Valve And The Cylinder That Has Drifted
Leaks at fittings and other types of hydraulic line connections may cause loss of oil flow and prevent components from attaining pressures necessary to perform work. Pressure loss generates complaints of weak force and implements drifting while in the HOLD condition. Check for leaks at all fittings and connections of hydraulic oil hoses/lines/tubes in the system in question. Correct any problems that are found, then retest for the system.
A Check Valve Is Not Closing Because Of Dirt Or Because Of A Worn Seat.
- Ensure that the machine is on a level surface.
- LOWER the blade all the way to raise the machine off of the ground.
- Move the implement control handle to the HOLD position.
- Shut off the engine.
Watch the lift cylinder rods for movement (cylinder rods retracting).
Note: If the makeup valve is sticking and not operating freely, there can be a pause in movement at the ground when lowering the blade. If the makeup valve leaks, "Down Pressure" may be weak. In the extreme, the implement may move UP, from external forces, with the control valve in the HOLD position.
The Control Valve Is Not Centering Correctly
Refer to Testing and Adjusting, "Calibration" in this manual.
The Lever Position Sensor Is Faulty
| Event Codes | ||
|---|---|---|
| Code and Description | Conditions which Generate this Code | System Response |
| E467(1) Blade Lift Control Out Of Neutral At Inappropriate Time | Indicates that the control function was in an active range when the engine was started. The implement system was turned on. | Release lever. Ensure that the lever is in neutral position. If unresponsive, test the handle. |
| E887(2) Blade Function Disabled Due to System Fault | This event only appears when the handle for the implement is displaced and when there is either a lockout switch fault or any short to battery solenoid diagnostic. An active EID 2115 will also be present during this event. | Move the blade control handle to neutral. Check active events and correct the problem. |
| E2115(2) Implements Disabled Due to System Fault | Activated when a diagnostic code is active for an implement system component for any of the following conditions: Short to battery condition on any of the blade control solenoids. Implement lockout switch is faulted (CID 0490). | Check active diagnostic codes and correct the problem. |
Check the monitoring system in order to check for event codes associated with the implement control handle raise/lower sensor.
If one or more of the above event codes is logged, check the monitoring system for fault codes related to the blade control handle raise/lower sensor.
Perform the calibration procedure for the blade control handle (position sensors). Refer to Testing and Adjusting, "Calibration" in this manual.