©2008-2017 McCoy Global
Manual № TM12012
80-0420-23 POWER TONG
Section 5
Page 5.16
Maintenance
5.10 TUBULAR CONNECTION EQUIPMENT DE-COMMISSIONING & SHIPPING (CONTINUED):
6.
Repair or replace any damaged or missing external body parts
7.
Inspect all paint - locations in which the paint has been damaged must be repaired prior to the tong being
returned to service. Prepare areas to be painted to ensure they are free of grease, dirt, or solvent. Touch up using
a solvent-based acrylic paint - “McCoy Grey” is paint color number RAL7015, “McCoy Yellow” (hazard areas) is
RAL1007, and McCoy Green is RAL6029 (contact McCoy sales for paint number for custom paint applications).
Allow sufcient time for paint to dry before proceeding.
8.
Perform a liberal lubrication of the equipment - refer to the Maintenance Section of this manual to determine
lubrication points. Generously fill the gear train housing with grease through the opening in the rotary gear.
9.
Connect the equipment to a hydraulic power unit. Ensure all quick-connect control lines are securely connected
to prevent equipment damage from excessive back pressure. Do not neglect to connect the motor drain.
10.
Energize hydraulic power to the tool.
11.
Rotate tong for one minute, stop, and reverse the direction of rotation for another minute, ending with the opening
of the rotary gear facing the gear train. De-energize the power unit, and perform another generous lubrication of
the gear train, including the gear housing.
12.
Energize hydraulic power to the tool. Rotate tong for one minute, stop, and reverse the direction of rotation for another minute,
ending with the opening of the rotary gear facing the gear train.
13.
De-energize the power unit, and perform a third generous lubrication of the gear train, including the gear housing.
14.
Energize hydraulic power to the tool, and rotate the tong for a final time, one minute in one direction, stop, and
reverse the direction of rotation for another minute, this time ending with the rotary gear in the “open throat”
position.
15.
Extend all hydraulic cylinders, and inspect cylinder rods for signs of mechanical damage, flaking, or rust. McCoy
recommends that damaged cylinders be replaced prior to storage.
16.
Depresurize the equipment in preparation for storage
1. Rotate the tong to the “open throat” position.
2. Exercise each hydraulic cylinder several times - open the tong and backup doors, retract and extend the
reversing pins, retract and extend the float cylinders. Finish with all cylinders except for the door cylinders
in their fully retracted position. The general idea is to have as little of the chrome cylinder rods exposed as
possible.
3. De-energize the power unit.
4. Repeatedly actuate the tong motor control valve lever IN BOTH DIRECTIONS to dissipate any residual
pressure in the valve and motor.
5. Remove the hydraulic SUPPLY line from the equipment.
6. Repeatedly actuate the remaining control valve levers IN BOTH DIRECTIONS to dissipate any residual
pressure in the remainder of the hydraulic control system.
7. Connect a low-pressure air supply line (10 PSI or less) to the hydraulic supply line, and force a small
amount of the remaining hydraulic fluid from the valve assembly - this will allow for thermal expansion of
the hydraulic fluid if the equipment is stored or transported in high ambient temperatures. Failure to do this
may result in damaged or destroyed seals in the equipment.
8. Disconnect the hydraulic RETURN line from the equipment.
9. Disconnect all remaining quick-connect hoses.
10. Disconnect all remaining connections from the equipment - for example, load cell connections, turns
counter connections, dump valve connections. Ensure the tool is completely free of all connections before
beginning storage preparations.
!
WARNING
HYDRAULIC PRESSURES AS HIGH AS OPERATING PRESSURE MAY REMAIN TRAPPED IN SMALL
AREAS OF THE EQUIPMENT. ENSURE ALL MAINTENANCE IS CARRIED OUT BY A QUALIFIED
SERVICE TECHNICIAN, AND THAT ADEQUATE PERSONAL PROTECTIVE EQUIPMENT IS USED TO
GUARD AGAINST PRESSURE INJURIES
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