408-2363
Rev K
4. Inspect the head assembly, with special emphasis on checking for worn, cracked, or broken jaws. If
damage to any part of the head assembly is evident, the tool must be evaluated and repaired. See
Section 5, REPLACEMENT AND REPAIR.
Jaw Closure Inspection
This inspection requires the use of a plug gage conforming to the dimensions in Figure 5. Proceed as
follows:
1. Knock out the roll pins securing dies to jaws, then remove dies.
2. Close the tool handles to the last notch on the ratchet (the handles will automatically open if they are
closed beyond this point).
3. Align the GO element with the tool jaws. Push the GO element straight into the jaw closure without
using force. The GO element must pass completely through the jaw closure as shown in Figure 5.
4. Align the NO-GO element with the jaw closure and try to insert it into the jaw closure. The NO-GO
element may start entry but must not pass completely through the jaw closure as shown in Figure 5.
5. Re-install the dies and secure them with the roll pins.
If the jaw closure conforms to the gage inspection, the tool is considered dimensionally correct and should
be lubricated with a THIN coat of any good SAE 20 motor oil. If not, the tool must be repaired before
returning it to service (see Section 5, REPLACEMENT AND REPAIR).
Ratchet Inspection
This inspection requires the use of a plug gage conforming to the dimensions in Figure 5. Proceed as
follows:
1. Knock out the roll pins securing dies to jaws, remove dies, then insert the NO-GO element between
tool jaws.
6.680-6.688 [.2630-.2633]
7.059-7.061 [.2779-.2780]
Figure 5
2. Close the tool handles until the ratchet releases then allow handles to open freely, and observe the
following:
a. Handles open before the ratchet hits the dowel pin.
Suggested Plug Gage Design
4.8 X 4.8 [.19 X .19]
(45° Ref)
pass completely
NO-GO element may enter
partially, but must not pass
completely through jaw closure.
