749-50092
Instructions
Derrick Controls
Adjustment Procedure
Introduction This instruction explains the procedure to adjust and calibrate the controls on the
DL/DM, DLB/DMB, D2000A, D3000A, D4000A, D2000B, D3000B, D4000B, and DT80
Series derricks. The procedure requires the following items in addition to normal
mechanics tools:
Tools • Quick disconnect installed in the return line of the control valve
(Altec kit p/n 970457959, if required)
• Electronic Low pressure gauge (0-600 psi or 0-1000 psi range)
• CADI
• Infrared (IR) thermometer
Sections of There are three sections to the procedure: Section 1: Differential Pilot Pressure Testing
Procedure and Adjustment Procedure, Section 2: Threshold Calibration Procedure, and Section
3:Max Out and Low Speed Calibration. Read and understand all steps of the instruc-
tions before beginning the procedure.
1. Position the unit on a level surface. Apply the parking brake and chock the wheels.
Engage the unit’s hydraulic system. Properly set the outriggers. Disengage the
hydraulic system and shut off the engine.
Section 1 Section 1: Differential Pilot Pressure Testing and Adjustment Procedure
Testing 2. Remove the turntable cover from the right side of the turntable (as viewed from the
boom tip looking toward the turntable).
3. Attach the pressure gauge to the tank pressure quick disconnect. Depending on
the design of the valve, this quick disconnect will be located either on the large tee
in the return line located to the left of the lower control valve (refer to Figure 1) or on
the small tee in the external pilot drain port located in the upper left corner of the
lower control valve (refer to Figure 2). Turn the gauge on, and zero it if it is not
showing zero.
Gauge
Return
Line
Figure 1 — Gauge On Return Quick Disconnect
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Section 1
Testing Drain Port
(Continued)
Test Quick
Disconnect
Figure 2 — Gauge On Pilot Drain Quick Disconnect
4. Start the engine. With the engine running at idle, energize the pilot system as
described in Step 4a or 4b.
a. If the unit is equipped with a two speed digger, move the digger shift switch to the
High position.
b. If the unit is not equipped with a two speed digger, fully shift and hold the
intermediate or upper boom hand control in the Retract position.
5. Record the tank pressure shown on the gauge.
6. Turn off the engine. Leaving the pressure gauge turned on, remove it from the tank
pressure quick disconnect and attach it to the pilot pressure quick disconnect, located
on the lower right corner of the lower control valve (refer to Figure 3). Do not rezero
the pressure gauge when relocating it. The same pressure gauge must be
used for both readings.
Pilot Pressure
Port
Figure 3 — Gauge On Pilot Pressure Quick Disconnect
7. Add 160 psi to the tank pressure recorded in Step 5 to obtain the upper value of the
pilot pressure range. Add 155 psi to the tank pressure value to obtain the lower value
of the pilot pressure range. (Example: upper value=160+tank pressure; lower
value=155+tank pressure.)
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Section 1 8. Start the engine. With the engine running at idle, energize the pilot system using the
Testing same function as in Step 4a or 4b. The pressure gauge should indicate within the range
(Continued) calculated in Step 7. If the pilot pressure is above or below this range, adjust the
pressure as described in Adjustment at the end of this Section.
9. Disengage the unit’s hydraulic system and turn off the engine. Disconnect the pressure
gauge and replace the turntable cover. Proceed to Section 2: Threshold Calibration
Procedure
Section 1 Adjustment
Adjustment 1. Remove the cap and loosen the jam nut on the pilot pressure reducing cartridge on the
lower control valve (refer to Figure 4). Turn the adjusting screw clockwise to increase
the pressure or counterclockwise to decrease the pressure. Hold the adjusting screw
to keep it from turning, and tighten the jam nut
Pilot Pressure
Reducing Cartridge
Figure 4 - Pilot Pressure Reducing Cartridge
2. Test the pressure at the pilot pressure quick disconnect.
3. Repeat the adjustment until the gauge indicates the within the range calculated in Step
7 under Testing.
4. Replace the cap on the pilot pressure reducing cartridge. Disengage the PTO and turn
off the engine. Disconnect the pressure gauge and replace the turntable cover.
5. Proceed to Section 2: Threshold Calibration Procedure
Section 2 Section 2: Threshold Calibration Procedure
1. Operate the unit to warm the hydraulic oil to 120 to 130 degrees Fahrenheit. This
temperature range is important. If the oil is not warmed to this temperature range,
the CADI settings resulting from the calibration procedures will not be
accurate, and poor meterability will result. One way to verify the oil temperature
is to use an infrared (IR) thermometer to read the temperature of the hydraulic reservoir
on or near the end opposite from the return line filter, at a point about 1/3 of the way above
the bottom of the reservoir (refer to Figure 5). The oil can be warmed quickly as
described in Step 1a or 1b.
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Section 2 a. If the unit is equipped with a digger, unstow the digger. Make sure the booms are
(Continued) fully retracted. With the engine at full RPM, operate Digger Dig at full speed while
holding the intermediate boom control fully shifted in the Retract position or holding
the pole guide open/close switch in the Close position. When the oil has reached
120 to 130 degrees Fahrenheit, stow the digger and proceed to Step 2.
b. If the unit is not equipped with a digger, make sure the booms are fully retracted.
With the engine at full RPM, operate Winch Raise/Winch Lower repeatedly at full
speed while holding the intermediate boom control fully shifted in the Retract
position or holding the pole guide open/close switch in the Close position. Do not
allow the load hook to contact the boom tip when operating Winch Raise. When
the oil has reached 120 to 130 degrees Fahrenheit, proceed to Step 2.
Return Line Filter
Measure
temperature
here on side or
end
Figure 5 - Reservoir Temperature Measurement
Location Using IR Thermometer
2. Connect the cable from the CADI to the CADI connection socket (refer to Figure 6).
Control
Console
Connection
Socket
CADI
Figure 6 - CADI Attached to Connection Socket
3. Position the boom at an angle from 10 to 30 degrees above horizontal (refer to Figure
7), and rotate it to a position where all the functions can be operated for calibration.
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Section 2
(Continued)
Indicating 10-30
Degrees
Figure 7 - Boom Angle Indicator
4. Set the low speed/standard switch to Standard on the control panel being used.
Operate with the engine at full RPM.
5. Record the MX setting for the function to be calibrated (Boom Up/Down, Rotation CW/
CCW, Intermediate Boom Extend/Retract, Upper Boom Extend/Retract, Winch In/
Out, or Digger Dig/Clean). Then change the TH and MX settings for this function to 00.
The value button on the CADI can be held down continuously until the setting reaches
00.
6. Operate the hand control and adjust the MX and TH values for the function being
calibrated as described in Steps 6a through 6g.
a. Fully shift and hold the hand control, and increase the MX value slowly until the
function starts moving.
b. Release the hand control, and decrease the MX value by 3 points.
c. Fully shift and hold the hand control, and check for function movement. If the
function is fully stopped, continue to step d. If the function is not fully stopped, go
back to step b.
d. Increase the MX value by 1 point every 5 seconds until the function begins to creep,
meaning to operate at the slowest movement noticeable. For Boom Up/Down,
watch the lift cylinder rod for movement. For other functions, compare the moving
component to a stationary object.
e. Release the hand control. Subtract 15 points from the MX value determined in the
previous step to obtain the required TH setting. Then adjust the TH value to this
number. For example, if the function begins to creep at MX=42, subtract 42-15=27,
and adjust the TH setting to 27.
f. Record the final TH setting on the CADI Values Sheet or the Field CADI Settings
Guide.
g. Return the MX setting to the value it had before it was changed to 00.
7. Repeat Steps 5-6 for each direction of each boom, winch, and digger function.
8. Proceed to Section 3:Max Out and Low Speed Calibration.
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Section 3 Section 3:Max Out and Low Speed Calibration
The Max Out (MX) and Low Speed (LMX) settings for the boom, winch, and digger
functions must be properly adjusted to achieve the correct valve spool travel and cycle
times at full control handle travel. Because the MX and LMX calibration procedures vary
for different models, refer to the latest CADI Quick Reference Guide (p/n 749-30200) or
the appropriate maintenance manual for the proper procedures.
Testing and 1. After all testing and adjustments are completed, engage the unit’s hydraulic system
Completion and operate the unit in all functions looking for leaks and proper operation. Make any
corrections necessary.
2. Stow the unit. Retract the outriggers. Disengage the hydraulic system and return the
unit to service.
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