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749-50092
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:
• 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
There are three sections to the procedure: Section 1: Differential Pilot Pressure Testing
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: Differential Pilot Pressure Testing and Adjustment Procedure
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.
Figure 1 — Gauge On Return Quick Disconnect
Instructions
Derrick Controls
Adjustment Procedure
Introduction
Tools
Sections of
Procedure
Section 1
Testing
Gauge
Return
Line
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