©2008-2017 McCoy Global
Manual № TM12012
80-0420-23 POWER TONG
Section 5
Page 5.12
Maintenance
5.9 MONTHLY MAINTENANCE CHECKLIST
The following maintenance checklist is intended as a guideline rather than a definitive maintenance schedule. More
or less maintenance may be required depending upon the frequency of use, the percentage of maximum torque that
the equipment is routinely subjected to, and the field conditions under which the equipment operates. McCoy Global
recommends that the following inspection and maintenance procedures be performed monthly under normal operating
conditions.
1.
Rotate cage plate/rotary gear until the opening in the rotary gear faces towards the rear of the tong.
!
WARNING
DO NOT PERFORM ANY FURTHER ACTIONS OR MAINTENANCE WHILE THE TONG IS CONNECTED
TO ANY HYDRAULIC POWER SUPPLY. MCCOY RECOMMENDS THAT ALL HYDRAULIC LINES ARE
FULLY DISCONNECTED, AND RESIDUAL HYDRAULIC PRESSURE IS BLED OFF. ENSURE ADEQUATE
CONTAINMENT IS IN PLACE TO PREVENT ENVIRONMENTAL CONTAMINATION FROM RESIDUAL
HYDRAULIC FLUID.
2.
Depressurize HyDraulic system in preparation For maintenance:
1. Rotate the tong to the “open throat” position. Ensure tong and backup doors (if equipped) are closed. Fully
extend the lift cylinder.
2. De-energize the power unit.
3. Repeatedly actuate the tong motor control valve lever IN BOTH DIRECTIONS to dissipate any residual
pressure in the valve and motor.
4. Remove the hydraulic SUPPLY line from the equipment.
5. Repeatedly actuate the remaining control valve levers IN BOTH DIRECTIONS to dissipate any residual
pressure in the remainder of the hydraulic control system.
7. Disconnect the hydraulic RETURN line from the equipment.
8. Disconnect remaining hoses such as case drains, or lines connected to the turns counter.
!
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.
3.
Clean the exterior of the tool thoroughly, using either a water hose with a spray nozzle or a pressure washer
using a low-pressure wash wand, or an appropriate solvent-based grease-cutting cleaner such as Varsol.
Ensure adequate containment is in place to prevent environmental contamination from residual hydraulic fluid,
dirty grease, and cleaning agents.
4.
Clean the interior spaces of the tool thoroughly, using either a water hose with a spray nozzle (do not use a
pressure washer), or an appropriate solvent-based grease-cutting cleaner such as Varsol. Ensure adequate
containment is in place to prevent environmental contamination from residual hydraulic fluid, dirty grease, and
cleaning agents. Make a note if any metal shavings or metal pieces are flushed out of the gear train cavity - if
shavings or metal pieces are seen the tong must be overhauled before it is returned to service.
5.
Inspect all fasteners and fastener safety wires (if equipped). Replace any missing fasteners - use Grade 8 bolts
only unless otherwise specified. Re-torque all external fasteners to SAE specifications.
6.
Repair or replace any damaged or missing external body parts, such as torque gauge mounts, hydraulic supports,
safety door protectors, etc.
7.
Perform a visual inspection of all protruding body pieces (example: hydraulic valve mounts, inlet & outlet line
supports, tong legs, shifter handle pivot lugs). Tighten or replace loose or missing fasteners. McCoy recommends
that damaged or missing body parts be repaired or replaced as soon as possible.
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