Bulletin No. SB-940
Tools
Supplement to SB-880 & 920
February 6, 1963
SUBJECT: TOOL BREAKAGE
#378455 and 379238 Propeller Torque Fixture.
Figure 1
We have received a number of complaints regarding pin breakage
(see arrow, figure 1) on #378455 and #379238 torque shafts.
Apparently, the small pins pressed into the bottoms of these two
torque shafts are not withstanding the maximum hub torque cap-
acity of 100 to 104 foot pounds (see SB-881), and break under
normal usage.
This sort of situation can be remedied by driving the broken
pin from the torque shaft with a punch, and slipping #307949
propeller drive pin in its place. This facilitates future
use of the torque shaft.
#307949 is a standard drive pin used on QD motors. The
diameter of this pin is such that it will engage all 10, 15
and 18 h.p. propeller hubs. We suggest cutting 1/8" from the
end of this pin, however, to assure good fit into the various
propeller hubs when using it in either of the subject torque
shafts.
Sincerely,
JOHNSON MOTORS
Robert Compton
Service Department
RC:eb
NOTE: Post on your QD (10 h.p.) and FD (18 h.p.) indexes.