Westco 16-25, Руководство по эксплуатации продукта, Страница: 27 / 49

Section 7
Jaw Installation and Parts
Installation
Jaw installation requirements vary according to the size of pipe to be gripped. Three general jaw
configurations are used with the 13-3/8 inch rotary and one configuration with the 16 inch rotary.
Jaw sizes available are listed in Figure 7-11.
WARNING: Do not attempt to remove or install jaws with power connected to the tong.
Disconnect the 1 inch hose and turn power unit off prior to replacing jaws.
Figures 7-1 through 7-8 provide guidance for jaw installation and parts listed as noted:
Figure 7-1 and 7-2 6-5/8 through 13-3/8 inch jaws
Figure 7-3 and 7-4 16 inch jaws
Figure 7-5 and 7-6 4 through 5-1/2 inch jaws
Figure 7-7 and 7-8 2-3/8 through 3-1/2 inch
jaws
During installation, disconnect the 1 inch hydraulic hose (pressure connection) and position
the tong to allow access to the underside with both doors fully open.
Auxiliary Cams
Master Jaws
Front Jaws
Auxiliary cams are required with jaws for 5-1/2 inch and smaller pipe. One auxiliary
cam is required for sizes 4 through 5-1/2 inches. Three auxiliary cams are required for
sizes 2-3/8 through 3-1/2 inches.
Install auxiliary cams by sliding the grooved flange onto the rotary flange and securing
with the attached retainer pins. The flat faces of the pins must face the rotary strap to
provide required clearance.
Install the drag magnet by holding the jaw upright and placing the magnet on the
retaining pins with the grooved face of the magnet away from the jaw. Hold the
magnet in place and slide the jaw onto the rotary or auxiliary cam. Insert the
reversing pin to retain the jaw and allow the magnet to rest on the case drag beneath
the jaw.
Hold the front jaws upright and slide the grooved jaw flange onto the rotary flange.
Insert the retainer bolts through the jaws and between the springs in the rotary.
Jaw Roller Size Check
Each jaw set assembly is provided with a roller sized to run standard new pipe or casing
designated by the jaw size. When refurbished, worn or non-standard pipe is used, the
jaws may not get a good grip on the pipe because the jaw roller does not move onto the
secondary cam surface (come out-of-the-pocket) or conversely, the jaw roller overrides the
pocket and goes to its extreme position (Figure 7-9). In either case, not enough force
is exerted and the jaws may slip.
A visual indication of this situation is the relative position of the reversing pin in
the reversing pin slot. Therefore, whenever beginning a run, the roller size should be
checked after stabbing and high torque is applied. As torque reaches the desired
maximum (or maximum delivered is less than required), visually check the position
of the reversing pin against Figure 7-10.
Correct the indicated condition by using the next larger or smaller jaw roller as
Indicated in Figure 7-11.
Section 7 Page 1