©2008-2017 McCoy Global
Manual № TM12012
80-0420-23 POWER TONG
Section 3
Page 3.16
Installation & Commissioning
Illustration 3.4.2: Jaw Disassembly
iii. Inspect the jaw pin and jaw roller for damage which may include (but is not limited to) distortion of shape
(out of round), corrosion, cracks, flat spots, or chips. Damaged components must be replaced.
iv. Thoroughly clean the jaw components using a solvent-based cleaner. If necessary use a stiff brush to
clean the jaw weldment/casting, including the jaw pivot through holes and the jaw roller pin through holes.
A stiff brush may also be required to clean retaining ring grooves on the jaw pin (where applicable).
v. Apply a liberal coating of grease to the jaw pin and all surfaces of the jaw roller. Re-install the jaw pin
and roller, and secure the jaw pin in the jaw weldment/casting with the appropriate fastener. NOTE: Jaw
pins secured by a weld bead must have the weld bead re-applied by an authorized, skilled welder.
vi. Re-check the jaw roller to ensure that it turns freely.
7. Apply a generous coating of grease to the jaw roller and pin. Rotate the roller several times to distribute the
grease.
8. Install the jaw assemblies one at a time. Liberally coat each jaw pivot bolt with a layer of grease before
installing.
3.4.2 Tong Jaw/Jaw Die Installation and Removal (Continued):
6. Inspect each of the two incoming jaw assemblies (continued):
• Place the jaw face down (roller up) on a sturdy surface. Wearing a leather work glove, attempt to rotate the
roller with the palm of your hand. Jaw rollers must spin freely to ensure proper camming action against rotary
gear during engagement with the tubular. If the roller turns freely, proceed directly to step 7. Rollers that are
jammed or otherwise “frozen” must be freed before installing and using jaw assemblies:
i. Extract the fasteners retaining the jaw roller pin. In most cases this will be a keeper screw, but in some
cases the jaw pin is secured using a retaining ring. Occasionally the jaw pin is secured using a weld
bead. In these instances the weld bead must be ground away before the jaw pin can be removed.
ii. Extract the roller pin. If necessary use a soft metal drive and hammer to tap the jaw pin out of its seat.
Removing the jaw pin allows the jaw roller to come free.
To Next Page
Loading...