©2008-2017 McCoy Global
Manual № TM12012
80-0420-23 POWER TONG
Section 6
Page 6.4
Troubleshooting
6.2 TONG RUNNING TOO SLOWLY
POSSIBLE PROBLEM SOLUTION(S)
1
Obstruction in tong hydraulic circuit
preventing adequate ow
Inspect self-sealing couplings to ensure they are properly engaged
The main hydraulic lines (supply and discharge) to the tong are obstructed.
Remove and clean if required
2
Power unit is not producing adequate ow or
pressure
Troubleshoot power unit (see user’s manual for your particular unit)
3
Tong motor is excessively worn and is
leaking hydraulic uid past the vanes
Replace motor or rebuild as per OEM instructions
4
Bearings in gear train and rotary section are
excessively worn
Overhaul tong. See Section 5.8 of this manual for instructions for exposing
the gear box and support roller assemblies.
5
Shifter has malfunctioned and the tong is not
shifting to high gear
Inspect and repair shift mechanism as necessary
6 Hydraulic uid viscosity too high
Ensure hydraulic uid meets McCoy specications
Ensure hydraulic uid is appropriate for climatic conditions, especially dur-
ing cold-weather operation
7 Bypass valve not functioning Check and repair
6.3 FAILURE OF JAWS TO GRIP PIPE
POSSIBLE PROBLEM SOLUTION(S)
1
Dies have become too dull to provide adequate
grip
Replace dies
2 Incorrect jaws are being used
Double-check jaw size to ensure they are rated for the diameter of
pipe or casing being run
3 Incorrect dies are being used
Ensure dies loaded in the jaws are appropriate for the type of pipe or
casing being run
4
Brake band(s) is (are) insufciently adjusted, not
allowing jaws to cam properly
Adjust brake bands to give proper resistance to cage plates
5 Jaw roller broken or worn
Remove jaw assembly and inspect. Replace rollers that are visibly
“at-spotted” or otherwise damaged
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