10
AP Dynamometer Service Manual
4.
Install the right plate with the gauge movement bracket assembly. Tip
the plate downwards to engage the pressure arm into the zero adjust
bracket. Do not force. Attach with the two ¼-28 X ½ socket head
screws (no washers). Align this plate parallel to the pressure bar and
torque. Note that the left plate is narrower than the right plate by .040"
to clear the dial pan and eliminate interference during loading.
5.
Install the right side ¼ inch thick cover plate with the spacer and attach
with two ¼-28 X ¾ socket head screws, flat and lock washers and
torque. The end of the spacer must be flush with the end of the plate.
6.
Leave the remaining left ¼ inch thick cover plate and spacer until
calibration is completed.
7.
Attach the dial pan with the four 10-32 X 3/8 socket head screws and
flat washers into the two angle brackets holding on the dial pan cover
plates. Align the hole at the center of the dial face with the pointer
shaft. Snug up the screws but do not tighten yet.
8.
Align the flats and attach the pointer onto the gauge movement shaft
by hand. Use a flat screwdriver end or similar device to reach into the
housing to hold the lower shaft bearing from being driven out when
setting the pointer to the shaft. Tap the pointer hub to the shaft until
firm while holding the bearing from coming out.
9.
While holding the pan, move the pointer clockwise at 90 degree
increments to determine that it is centered to the pan and that the pan
is uniform in height with the pointer. Now tighten the four socket head
screws that hold the pan to the mounting covers. Recheck the pointer
movement for interference and readjust if necessary.
10.
Install the bezel to the pan with the four 6-32 X ¼ pan head screws.
11.
Calibrate per the procedures in the
Calibration
section of this manual.
12.
Now install the remaining ¼ inch serial I.D. cover plate with two ¼-28
X ¾ socket head screws, flat and lock washers and torque. Again, this
plate has .040" more clearance to the dial pan than the adjoining plate.
13.
When reinstalling the shackles and/or swivel hook, install the snap ring
end of the 1" diameter mounting pin toward the dial side of the pres-
sure bar. Install the roll pin with more clearance on the other end.
If you are installing a new
pressure bar, be sure the
capacity marking on the new
bar matches the marking on
the old bar. The capacity letter
along with other numbers are
located on the end of the bar
with the 3 9/16" wide end. It is
on the outside corner which is
on the same side as the center
cutout. The identifier is the far
most right number in the string
of numbers. See Table 1 for a
list of letters and capacities.
