80-0420-23 POWER TONG
Manual № TM12012
Section 6
Page 6.3
©2008-2017 McCoy Global
Troubleshooting
Adequate maintenance and proper uid selection is essential for minimizing hydraulic-related failures. All troubleshooting must
be performed by a technician trained in hydraulic systems, and familiar with the equipment design, assembly and operation.
The following troubleshooting instructions are intended to be guidelines only. Any faults not solved through the use of this guide
should be referred to our engineering department for their evaluation and recommendations.
6.0 TONG WILL NOT DEVELOP SUFFICIENT TORQUE
POSSIBLE PROBLEM SOLUTION(S)
1
Malfunctioning relief valve on tong hydraulic
circuit
Troubleshoot relief valve as per subsection 6.1 or OEM instructions.
2 Directional valve is leaking
Check directional valve. Neutral position should return uid directly to the
reservoir. Replace or repair valve to ensure correct operation
3
Power unit is not producing adequate
pressure
Troubleshoot power unit (see user’s manual for your particular unit)
4
Poor hydraulic pressure at the tong despite
adequate pressure at the power unit, or
excessive back pressure in the return line.
Restrictions exist in line between power unit and tong. Inspect integrity of
self-sealing couplings to ensure they are allowing full uid ow. Check to
ensure no other restrictions exist (contaminated catch screens or lters,
for example)
5
Fluid viscosity is not appropriate (too high or
too low)
Ensure hydraulic uid being used is the viscosity recommended by
McCoy Global. Power unit pump may not prime if uid is too heavy, and
the hydraulic system will overheat if uid is too light. Replace with proper
viscosity uid
Hydraulic uid viscosity is affected by environmental conditions. Ensure
the uid being used is suitable for high or low temperatures. Replace with
proper viscosity uid for the operating conditions if necessary
6
Worn or damaged tong motor causing
slippage
Replace or repair worn or damaged motor
7
Damaged bearings or gears causing
excessive drag
Replace or repair worn or damaged gears or bearings
8 Jaws slipping on pipe
Ensure jaw dies are not worn to the point that they cannot grip. Ensure the
correct sized jaws are in use
9 Torque gauge is indicating incorrectly
Incorrect gauge is being used. Ensure gauge is the proper range, and has
been properly calibrated for the arm length of the equipment in use
Gauge has been damaged. Check gauge operation and calibration on
independent system
Gauge has mistakenly been married to an incorrect load cell
10 Load cell is measuring incorrectly
Incorrect load cell is being used
Air is trapped in torque measuring circuit (load cell, hydraulic line, or
gauge). Refer to torque measurement troubleshooting in Section 8.1 of
this manual
Load cell has been damaged. Replace load cell, or return to McCoy for
repair and re-calibration
POSSIBLE PROBLEM SOLUTION(S)
11
Incorrect motor speed selected (applies to
2-speed motors only)
Maximum torque can only be developed when LOW motor speed
(maximum hydraulic displacement) is selected.
12 Incorrect tong gear selected Maximum torque can only be developed when LOW motor gear is selected
NOTICE
MCCOY GLOBAL GUARANTEES CALIBRATION OF A LOAD CELL/TORQUE GAUGE ASSEMBLY FOR A
PERIOD OF ONE YEAR. MCCOY SUGGESTS THAT THE LOAD CELL/TORQUE GAUGE ASSEMBLY BE
RETURNED TO THE FACTORY FOR RE-CALIBRATION ON A YEARLY BASIS.
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