Farr KT5500 Technical Manual page 60

KT5500 5- " T & CLInCHER® B
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/
ong
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Perform a visual inspection of all hydraulic lines. Replace flexible lines if they appear to be cracked, fatigued, or have
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visible signs of wear from contact with a rigid object.
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Perform a complete greasing of the tong - refer to Maintenance section of the technical manual
Ensure main supply and return connections to the tong are fully made up. Re-connect the remainder of the hydraulic
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lines, and, if applicable, the electrical line to the turns counter.
FAILURE TO ENSURE THAT THE SELF-SEALING SUPPLY AND RETURN LINES ARE FULLY
MADE UP MAY RESULT IN CATASTROPHIC EQUIPMENT FAILURE.
If using a stand-alone power unit, start it now - refer to the power unit technical manual for startup procedures. Listen to power unit for
a moment to see if there are any unusual mechanical sounds (rubbing, grinding, excessive pump noise). If using a diesel unit, allow
sufficient time for the engine to reach operating temperature before increasing engine RPM. Once engine is warm, gradually increase
engine RPM until operating speed is reached.
Ensure that supply pressure is at or above the tong's specified operating pressure, and that the return pressure is less
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than 350 psi.
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Perform a visual inspection of pressurized hydraulic lines. Document and correct any hydraulic fluid leaks.
Perform a full functional test of the tong. Report and correct any hydraulic leaks from the hydraulic valve bank, or from
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any hydraulic cylinders that are used.
Perform a visual inspection of the load cell. If using a tension load cell, replace any cracked, broken, or distorted com-
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ponents including links and chains. If using a compression load cell, replace any component that has been crushed or
otherwise distorted through compression.
If applicable, inspect the load cell anchor pins (tension load cell only). Replace the anchor pins if cracking or metal
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distortion is seen.
If applicable, the weld securing the single load cell anchor to the bridge bar main plate must be inspected (compression
load cell only). If the integrity of the weld has been compromised, the tong must be removed from service until the weld
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is repaired. The load cell beam will need to be disconnected and removed so the weld is visible. Before re-installing the
beam, liberally grease the anchor pin before reinserting into the load cell beam.
Test safety door feature (if equipped). Open the tong door(s), and attempt to rotate the cage plate at low speed (low
gear) in both directions (makeup and breakout). If cage plate begins rotating, the safety door mechanism is not func-
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tional, and the tong must be removed from service until the safety door mechanism can be repaired. If the safety door
is operating correctly, cage plate rotation will not be inhibited once the door is closed and latched.
NEVER OPERATE YOUR EQUIPMENT WITH A BYPASSED OR MALFUNCTIONING SAFETY
DOOR
While rotating the cage plate, ensure that the jaws properly cam. If the jaws do not cam properly, the brake bands
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need to be tightened. Incrementally adjust both the top and bottom brake bands EQUALLY until proper cam action
is achieved.
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