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premier manufacturing company
Page 2
heavy grease before the parts are reassembled.
DO NOT LUBRICATE PINTLE HOOK WEAR
SURFACE.
► Clean, inspect and lubricate latch components
every 90 days or sooner if required by the
operating environment.
► Clean and inspect the coupling for damage and
excessive wear prior to each and every use.
► Do not over-tighten fasteners as this may cause
damage.
ASSEMBLY
1)
IF
you are replacing the 279 Shoe and its
components, then follow the instructions below:
Otherwise continue on to #2
.
A) Place the 266 Spring over the nipple on the
279 Shoe. Insert as assembled through the
opening at the top of the coupling and into the
cavity at the bottom. The 266 Spring should
seat into the concave cavity, which resides
below the pintle base. The 266 Spring must
be slightly compressed to align the 279 Shoe
hole with the bottom body hole. From the left
side of the body, insert the 274 Bolt (left to
right) into the bottom coupling body hole and
secure on the right side with 274A Locknut.
Rotate the 279 Shoe to verify proper spring
tension (see Image #5.)
2) Using snap ring pliers, install one 275-50 Snap
Ring into one groove on the 275 Pin. Verify that
the snap ring is fully seated into its groove.
3) Take the 273A Spring and hold it so that the
straight leg is on the left side pointing downward
and the hooked leg is on top pointing to the right.
4) Holding this position, insert the spring into the
top left side interior body, aligning it with the 275
Pin body hole. The straight leg of the spring
aligns along the interior body sidewall (see
Image #3.)
5) Note the “flat” area on the 275 Pin. Insert the
275 Pin from the left side into the body until the
273A Spring rests on it.
6) Insert the 273 Pawl into the top of the coupling,
keeping the hooked leg of the spring on the
bottom catch ledge of the pawl.
7) Align the pawl hole with the 275 Pin. Slide the
275 Pin through the pawl and out the other side
of the coupling body (see Image #4.)
8) If the spring is installed correctly, smooth
increasing spring resistance should be felt when
rotated to the open position. If no resistance or
binding is felt, the spring and/or parts are not
installed correctly. Reassemble correctly.
9) Slide the 273 Pawl to the left and rotate it to the
open position, to locate the set screw hole on the
underside of the 273 Pawl (see Image #5.)
10) Rotate the 275 Pin until the “flat” aligns with the
set screw hole, then insert the 273C Set Screw
and tighten.
11) Use caution and allow the spring loaded 273
Pawl to return to the closed position.
12) Using snap ring pliers, install the second 275-
50 Snap Ring, on the right side, into the groove
on the 275 Pin. Verify that the snap ring is fully
seated into its groove.
13) Slide the 273 Pawl to the left and rotate it to the
open position. While holding the pawl in the
open position, locate the 274 Bolt and partially
insert it through the left side body hole.
14) Insert the 272 Latch into the body, until the latch
hole aligns with the 274 Bolt and slide the bolt
through until the bolt head is flush against the
body. Secure the bolt on right side with the 274A
Locknut.
15) Once the coupling is assembled it should be
opened and closed several times, testing for
smooth and correct operation. DO NOT use the
coupling if it does not operate properly. Call for
assistance.
ASSEMBLY IS COMPLETE
NOTE
: Use only new Grade-8 fasteners torqued
to SAE specifications when mounting the
assembled coupling to its mounting structure.
WARNING
:
Do NOT bind-up (jackknife) any application, as
stresses can cause damage to the hitch, drawbar
eye, other components or any combination of
them. Jackknifing may result in failure of products
or components, resulting in detachment of the
trailer while in use.