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Page 1
THE FIRST NAME IN QUALITY COUPLINGS
270PK SERVICE GUIDELINES
BEFORE GETTING STARTED
:
► This procedure should only be performed by a
qualified mechanic.
► Measure the wear on the coupling’s pintle
hook. If the wear is at or exceeds 20% of the
cross section, the coupling is considered Out of
Service. Do Not continue. Premier has Wear
Gages to determine wear on our Couplings and
Drawbar Eyes.
► Examine the entire coupling body for excessive
wear or any damage. If any exists, do Not
continue, coupling needs to be replaced.
► Tools required: snap ring pliers; 1 1/16” socket;
3/16” Allen wrench.
►
CAUTION
: When removing and replacing
snap rings the appropriate snap ring plier tools
are necessary. Do not attempt removal or
replacement without the correct snap ring plier
tools. In addition, use caution when removing
and replacing snap rings – Do not over-expand
them as damage could result. Also, when
assembling a snap ring into position - Make
certain that the snap ring is fully seated into the
groove.
► Safety glasses are required for all of the
following procedures.
► See attached Image Reference Section(s) with
photos and/or drawings to identify various parts.
► Prior to disassembly, familiarize yourself with the
location of all the various parts in the coupling.
This will assist in the assembly process.
DISASSEMBLY
1) The 270 Coupling should be positioned upright
with the latch in the closed position (see Image
#2 in the Image Reference Section.)
2) Locate the 274 Bolt, which resides within the 272
Latch, and remove the 274A Locknut from the
right side. Slide the 274 Bolt out from the left
side. Remove the 272 Latch.
3) Slide the 273 Pawl to the left and rotate it to the
open position.
4) Remove the 273C Set Screw located on the
underside of the 273 Pawl (see Image #5.)
5) Remove the 275-50 Snap Ring from the right
side of the 275 Pin.
6) Slide the 275 Pin out from the left side and then
remove the 273 Pawl and 273A Spring.
7)
IF
you are replacing the 279 Shoe and its
components, then follow the instructions below:
Otherwise, continue on to #8
.
A) Locate the 274 Bolt, which resides within the
279 Shoe at the bottom of the coupling and
remove the 274A Locknut from the right side.
Slide the 274 Bolt out from the left side and
remove the 279 Shoe and 266 Spring.
8) With all parts removed from the coupling body,
clean and inspect the body for wear and/or
damage. If wear exists or damage is noted, do
not attempt to repair. DO NOT ATTEMPT WELD
REPAIR OF ANY DAMAGED AND/OR WORN
PART.
DISASSEMBLY IS COMPLETE
IMPORTANT NOTES TO CLEAN,
INSPECT & LUBRICATE
:
► Use only genuine PREMIER replacement parts
on any repairs. Use of other parts, which can
have different specifications or tolerances, may
fail to alert you to non-obvious damage to the
hitch which can lead to hitch failure.
► All body holes, part holes and pins need to be
thoroughly cleaned and lubricated with a
270
Coupling
