Proc_Cal_005: Lower Valve Output Threshold
WHEN TO PERFORM
Performed when troubleshooting procedures indicate,
when lower valve components have been serviced, or
when the lower valve is replaced.
CALIBRATION ORDER
1. Proc_Cal_001
2. Proc_Cal_002
3. Proc_Cal_005
WHY PERFORM
All electro-hydraulic valves have different operating
characteristics. One of the key characteristics is the
point at which hydraulic flow begins for a given com-
mand current. This cracking' current is determined by
this process.
HOW TO PERFORM
WARNING
Keep yourself and all others clear of the lift mech-
anism. Never allow anyone under or on the forks.
Never put hands, arms, head, or legs through the
mast or near the carriage or lift chains. This warn-
ing applies not only to the operator but also the
helper. A helper must not be near the load or the
lift mechanism while the operator is attempting to
handle a load. The lift mechanism has moving
parts with close clearances that can cause seri-
ous injury.
Refer to Table 7 for the procedures on how to perform
Pro_Cal_005: Lower Valve Output Threshold.
Table 7. Proc_Cal_005: Lower Valve Output Threshold
A. TYPICAL DISPLAY WITHOUT KEY, WITH OPTIONS
B. TYPICAL DISPLAY WITH KEY, WITHOUT OPTIONS
Perform Proc_Cal_001: Service Password Entry and Proc_Cal_002: Hydraulic Valve Calibration Warm Up
and Air Bleed before proceeding.
Information: "Creep" is defined as the threshold when a function first starts to move very slowly (barely percepti-
ble motion). The identification of this motion is defined as the "visual method." This procedure cannot be per-
formed by using the pressure method.
8000 YRM 1134 Proc_Cal_005: Lower Valve Output Threshold
Confidential/Proprietary - Do Not Copy or Duplicate 13
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