Proc_Cal_002: Hydraulic Valve Calibration Warm Up and Air
Bleed
WHEN TO PERFORM
Performed when any hydraulic calibration items are
performed.
CALIBRATION ORDER
1. Proc_Cal_025
2. Proc_Cal_001
3. Proc_Cal_002
WHY PERFORM
Hydraulic calibrations are the process of setting the
hydraulic current levels that result in initial function
movement. Pressure and flow are directly related to
the hydraulic fluid viscosity which is a function of the
fluid temperature. Air, trapped within the lift valve as-
sembly, may produce slight mast movement at en-
gine start. This process ensures that the hydraulic
fluid achieves an optimum temperature, and that the
air is bled out of the lift valve and cylinders prior to
performing calibrations.
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 4 for the procedures on how to perform
Proc_Cal_002: Hydraulic Valve Calibration Warm Up
and Air Bleed.
8000 YRM 1134 Proc_Cal_002: Hydraulic Valve Calibration Warm Up and Air Bleed
Confidential/Proprietary - Do Not Copy or Duplicate 5
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