Temporary Loss Of Hydraulic Blade Control
Usage:
TRACK-TYPE TRACTORSD11R (AAF, 7PZ) TRACK-TYPE TRACTORS
Problem:
During certain operations, pilot supply pressure may drop below nominal setting. This is most noticeable during rapid engine deceleration when the cooling fan is at maximum speed. This condition may cause the raise, lower or float functions to be temporarily disabled.
The following procedure may be used to test for this condition.
- *All systems should be at operating temperature.
- *Unplug the fan solenoid (max fan speed).
- *Lower the blade to the ground.
- *Arm the float feature and place the control in the float position.
- *Set the engine speed to high idle.
- *Rapidly depress the decelerator pedal to full decel position.
- *Unplug the fan solenoid (max fan speed).
If the blade goes into a power down condition (the front of the machine raised), this is a symptom of pilot supply pressure loss.
Solution:
Engineering is currently developing improvements to the pilot system that should provide a more consistent and stable pilot pressure. The target availability is first quarter 2002.
If your situation warrants immediate action, contact the LTTT product analyst on (309) 494-0887.
COPYRIGHT 2001 CATERPILLAR ALL RIGHTS RESERVED
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