Farr KT5500 Technical Manual page 63

M
aInTEnanCE
Re-energize power unit and extend all hydraulic cylinders. Inspect cylinder rods for signs of mechanical damage, flak-
28.
ing, or rust. Farr recommends that damaged cylinders be replaced.
29. Rotate tong in low gear for 5 minutes while monitoring pressurized seals and hydraulic lines. If a seal, line, or fitting
begins to leak while tong is rotating, it must be replaced before the equipment is returned to service.
Rotate tong in high gear for 5 minutes while monitoring temperature of top and bottom bearing caps. If the bearing caps
30.
are hot to the touch (higher than approximately 50
unusual noises check for damaged bearings (see Maintenance Manual for all bearing locations).
Install load cell. If using a tension load cell, perform a visual inspection and replace any cracked, broken, or distorted
31.
components 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
32.
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
33.
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.
Inspect load cell for damage or signs of stress. Check oil level in load cell and fill if necessary (refer to technical manual
34.
Section 7 or Section 8).
While rotating the cage plate, ensure that the jaws properly cam. If the jaws do not cam properly, the brake bands
35.
need to be tightened. Incrementally adjust both the top and bottom brake bands EQUALLY until proper cam action is
achieved. Refer to the maintenance section of the manual for instructions on properly adjusting brake bands.
Perform a full functional test of the tong including, if applicable, backup components, lift cylinder, and float frame com-
36.
ponents. Report and correct any hydraulic leaks from the hydraulic valve bank, or from any hydraulic cylinders that
are used.
Test safety door feature (if equipped). Begin rotating the tong at low speed, and open the tong door(s). If rotation does
not immediately stop, this is an indication that the safety door mechanism is not operating correctly and the tong must
37.
be removed from service until the mechanism is repaired. Repeat the test while operating the tong in the opposite direc-
tion. 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
Farr recommends that an anti-corrosive agent such as Tectyl® 506 be applied to all external unpainted surfaces
38.
(and chain slings) EXCEPT cylinder rods, jaw rollers, and rotary gear camming surfaces. Refer to manufacturer data
sheets for proper application and safety information.
Once all of the above maintenance checklist items have been satisfactorily completed the tool may
be returned to service.
KT5500 5-
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C) replace the applicable bearings. Likewise if the tong is making
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